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1. Pulsed production of antihydrogen

Author: G. Nebbia, Marco Prevedelli, M. Antonello, I. C. Tietje, B. Rienäcker, Daniel Comparat, Alberto Rotondi, M. Fanì, Sebastiano Mariazzi, O. Khalidova, Roberto S. Brusa, Nicola Zurlo, Davide Pagano, A. Camper, S.R. Müller, Markus K. Oberthaler, V. Petracek, Ole Røhne, C. Zimmer, Patrick Nedelec, Giovanni Consolati, Valerio Toso, Chloé Malbrunot, A. Hinterberger, Germano Bonomi, Lea Di Noto, P. Cheinet, Rafael Ferragut, Luca Povolo, P. Yzombard, Marco Giammarchi, Lilian Nowak, F. Prelz, J. Fesel, Sebastian Gerber, Ruggero Caravita, Emmanuel Oswald, Heidi Sandaker, Romualdo Santoro, Alban Kellerbauer, A. S. Belov, Luca Penasa, F. Guatieri, Angela Gligorova, Lisa Theresa Glöggler, Viktor Matveev, T. Wolz, Claude Amsler, D. Krasnický, A. Demetrio, G. Testera, Fabrizio Castelli, Michael Doser, S. Haider, Massimo Caccia, V. Lagomarsino, Laboratoire Aimé Cotton (LAC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire Kastler Brossel (LKB [Collège de France]), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Collège de France (CdF (institution)), Amsler, Claude, Antonello, Massimiliano, Belov, Alexander, Bonomi, Germano, Brusa, Roberto Sennen, Caccia, Massimo, Camper, Antoine, Caravita, Ruggero, Castelli, Fabrizio, Cheinet, Patrick, Comparat, Daniel, Consolati, Giovanni, Demetrio, Andrea, Di Noto, Lea, Doser, Michael, Fanì, Mattia, Ferragut, Rafael, Fesel, Julian, Gerber, Sebastian, Giammarchi, Marco, Gligorova, Angela, Glöggler, Lisa Theresa, Guatieri, Francesco, Haider, Stefan, Hinterberger, Alexander, Kellerbauer, Alban, Khalidova, Olga, Krasnický, Daniel, Lagomarsino, Vittorio, Malbrunot, Chloé, Mariazzi, Sebastiano, Matveev, Viktor, Müller, Simon, Nebbia, Giancarlo, Nedelec, Patrick, Nowak, Lilian, Oberthaler, Marku, Oswald, Emmanuel, Pagano, Davide, Penasa, Luca, Petracek, Vojtech, Povolo, Luca, Prelz, Francesco, Prevedelli, Marco, Rienäcker, Benjamin, Røhne, Ole, Rotondi, Alberto, Sandaker, Heidi, Santoro, Romualdo, Testera, Gemma, Tietje, Ingmari, Toso, Valerio, Wolz, Tim, Yzombard, Pauline, Zimmer, Christian, and Zurlo, Nicola
Subjects: Physics::General Physics, experimental methods, QC1-999, positronium, antihydrogen: annihilation, General Physics and Astronomy, Astrophysics, 7. Clean energy, 01 natural sciences, 010305 fluids & plasmas, law.invention, Positronium, antihydrogen: energy levels, symbols.namesake, law, 0103 physical sciences, Atom, Physics::Atomic and Molecular Clusters, antimatter, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], antihydrogen: temperature, Physics::Atomic Physics, 010306 general physics, Antihydrogen, Physics, laser: pulsed, Antimatter gravity, atom, antihydrogen: production, Laser, charge exchange, anti-p, electric field, positron: beam, QB460-466, electromagnetic, injection, equivalence principle, Antiproton, Antimatter, Excited state, Rydberg formula, symbols, Atomic physics, Particle Physics - Experiment, experimental results
Abstract: Antihydrogen atoms with K or sub-K temperature are a powerful tool to precisely probe the validity of fundamental physics laws and the design of highly sensitive experiments needs antihydrogen with controllable and well defined conditions. We present here experimental results on the production of antihydrogen in a pulsed mode in which the time when 90% of the atoms are produced is known with an uncertainty of ~250 ns. The pulsed source is generated by the charge-exchange reaction between Rydberg positronium atoms—produced via the injection of a pulsed positron beam into a nanochanneled Si target, and excited by laser pulses—and antiprotons, trapped, cooled and manipulated in electromagnetic traps. The pulsed production enables the control of the antihydrogen temperature, the tunability of the Rydberg states, their de-excitation by pulsed lasers and the manipulation through electric field gradients. The production of pulsed antihydrogen is a major landmark in the AE $$\bar{g}$$ IS experiment to perform direct measurements of the validity of the Weak Equivalence Principle for antimatter. Antihydrogen atoms are a unique type of antimatter that can be used to probe small violations of fundamental laws of physics. The authors present experimental results obtained with the AEgIS project at CERN for the production of antihydrogen atoms (Hbar) via charge exchange with laser excited positronium that allow for precise timing of Hbar production.
Published: 2021

2. Hybrid imaging and timing ps laser excitation diagnostics for pulsed antihydrogen production

Author: G. Testera, G. Nebbia, D. Krasnický, Fabrizio Castelli, A. Demetrio, Michael Doser, V. Lagomarsino, Rafael Ferragut, Alberto Rotondi, Giovanni Consolati, Germano Bonomi, Sebastiano Mariazzi, L. T. Glöggler, T. Wolz, A. Camper, Heidi Sandaker, M. Oberthaler, Angela Gligorova, Ruggero Caravita, Daniel Comparat, L. Di Noto, Sebastian Gerber, O. Khalidova, Patrick Nedelec, V. A. Matveev, F. Guatieri, A. Hinterberger, Marco Giammarchi, Massimo Caccia, Davide Pagano, V. Toso, C. Zimmer, F. Prelz, M. Fanì, M. Antonello, I. C. Tietje, E. Oswald, Luca Penasa, S.R. Müller, B. Rienäcker, Roberto S. Brusa, Romualdo Santoro, V. Petracek, A. S. Belov, S. Haider, Chloé Malbrunot, Ole Røhne, Nicola Zurlo, Laboratoire Aimé Cotton (LAC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: 010302 applied physics, Physics, Bar (music), business.industry, Physics::Instrumentation and Detectors, Detector, General Physics and Astronomy, 02 engineering and technology, Scintillator, 021001 nanoscience & nanotechnology, Laser, 01 natural sciences, Signal, [PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph], law.invention, Optics, law, 0103 physical sciences, Microchannel plate detector, 0210 nano-technology, business, Antihydrogen, Excitation
Abstract: International audience; In this work we present a hybrid detection method providing simultaneous imaging and timing information suitable for fully monitoring positronium (Ps) formation, its laser excitation, and its spatial propagation for the first trials of pulsed antihydrogen ($\bar{H}$) production through a charge-exchange reaction with trapped antiprotons ($\bar{p}$). This combined method, based on the synchronous acquisition of an EJ-200 scintillation detector and a microchannel plate (MCP) detector with a dual readout (phosphor screen image and electrical pick-up signal), allows all relevant events in the experiment to be accurately determined in time while allowing high resolution images of e$^{+}$ from Ps laser photodissociations to be acquired. The timing calibration process of the two detectors discussed in details as well as the future perspectives opened by this method.
Published: 2020

3. Rydberg-positronium velocity and self-ionization studies in a 1T magnetic field and cryogenic environment

Author: G. Nebbia, Patrick Nedelec, Sebastiano Mariazzi, Giovanni Consolati, Germano Bonomi, G. Testera, L. T. Glöggler, Luca Penasa, Fabrizio Castelli, F. Prelz, Michael Doser, V. Lagomarsino, Ruggero Caravita, M. Oberthaler, Angela Gligorova, Daniel Comparat, Nicola Zurlo, B. Rienäcker, Roberto S. Brusa, V. Petracek, M. Antonello, Massimo Caccia, I. C. Tietje, Davide Pagano, S. Haider, T. Wolz, C. Zimmer, A. Hinterberger, L. Di Noto, M. Fanì, Sebastian Gerber, L. Nowak, F. Guatieri, E. Oswald, A. Camper, Heidi Sandaker, Rafael Ferragut, D. Krasnický, J. Fesel, Romualdo Santoro, Alberto Rotondi, V. Matveev, A. S. Belov, Ole Røhne, O. Khalidova, S. Müller, Chloé Malbrunot, Laboratoire Aimé Cotton (LAC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and AEgIS
Subjects: Stark effect, Atomic Physics (physics.atom-ph), positronium, FOS: Physical sciences, Light-induced processes in atomic-scale systems, Penning traps, 7. Clean energy, 01 natural sciences, Physics - Atomic Physics, 010305 fluids & plasmas, Positronium, Charge-transfer collisions, symbols.namesake, molecular processes in external fields, Physics in General, 0103 physical sciences, Principal quantum number, Physics::Atomic and Molecular Clusters, Multiphoton or tunneling ionization &amp, Atomic & molecular processes in external fields, Charge-transfer collisions, Multiphoton or tunneling ionization & excitation, Penning traps, Stark effect, Physics::Atomic Physics, 010306 general physics, Antihydrogen, Physics, Atomic &amp, excitation, [PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph], Magnetic field, Excited state, Antimatter, symbols, Rydberg formula, Atomic physics
Abstract: We characterized the pulsed Rydberg-positronium production inside the Antimatter Experiment: Gravity, Interferometry, Spectroscopy (AE$\overline{\textrm{g}}$IS) apparatus in view of antihydrogen formation by means of a charge exchange reaction between cold antiprotons and slow Rydberg-positronium atoms. Velocity measurements on the positronium along two axes in a cryogenic environment (≈10K) and in 1T magnetic field were performed. The velocimetry was done by microchannel-plate (MCP) imaging of a photoionized positronium previously excited to the $n$=3 state. One direction of velocity was measured via Doppler scan of this $n$=3 line, another direction perpendicular to the former by delaying the exciting laser pulses in a time-of-flight measurement. Self-ionization in the magnetic field due to the motional Stark effect was also quantified by using the same MCP-imaging technique for Rydberg positronium with an effective principal quantum number $n_\textrm{eff}$ ranging between 14 and 22. We conclude with a discussion about the optimization of our experimental parameters for creating Rydberg positronium in preparation for an efficient pulsed production of antihydrogen. We characterized the pulsed Rydberg-positronium production inside the AEgIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) apparatus in view of antihydrogen formation by means of a charge exchange reaction between cold antiprotons and slow Rydberg-positronium atoms. Velocity measurements on positronium along two axes in a cryogenic environment (10K) and in 1T magnetic field were performed. The velocimetry was done by MCP-imaging of photoionized positronium previously excited to the $n=3$ state. One direction of velocity was measured via Doppler-scan of this $n=3$-line, another direction perpendicular to the former by delaying the exciting laser pulses in a time-of-flight measurement. Self-ionization in the magnetic field due to motional Stark effect was also quantified by using the same MCP-imaging technique for Rydberg positronium with an effective principal quantum number $n_{eff}$ ranging between 14 and 22. We conclude with a discussion about the optimization of our experimental parameters for creating Rydberg-positronium in preparation for an efficient pulsed production of antihydrogen.
Published: 2020
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4. Gravity and antimatter: The AEgIS experiment at CERN

Author: A. Hinterberger, L. Smestad, G. Nebbia, G. Testera, Marco Prevedelli, Marco Giammarchi, J. Robert, Nicola Pacifico, I. C. Tietje, Luca Penasa, Johann Marton, Fabrizio Castelli, Fiodor Sorrentino, Z. Mazzotta, P. Lebrun, Michael Doser, Alban Kellerbauer, Rafael Ferragut, Victor Matveev, Heidi Sandaker, Nicola Zurlo, L. Ravelli, O. Khalidova, S. Haider, Davide Pagano, Giovanni Consolati, Germano Bonomi, C. Zimmer, H. Holmestad, Sebastiano Mariazzi, Ole Røhne, M. Oberthaler, Angela Gligorova, Stefano Aghion, Chloé Malbrunot, Sebastian Gerber, S.R. Müller, Ruggero Caravita, Patrick Nedelec, Johann Zmeskal, F. Guatieri, Romualdo Santoro, P. Yzombard, Alberto Rotondi, J. Fesel, Eberhard Widmann, P. Lansonneur, V. Lagomarsino, B. Rienaecker, L. Di Noto, Claude Amsler, Massimo Caccia, Daniel Comparat, Giovanni Cerchiari, D. Krasnický, A. Demetrio, F. Prelz, Roberto S. Brusa, V. Petracek, M. Fanì, A. Evans, Adriano Fontana, Laboratoire Aimé Cotton (LAC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Pagano D., Aghion S., Amsler C., Bonomi G., Brusa R.S., Caccia M., Caravita R., Castelli F., Cerchiari G., Comparat D., Consolati G., Demetrio A., Noto L.D., Doser M., Evans A., Fani M., Ferragut R., Fesel J., Fontana A., Gerber S., Giammarchi M., Gligorova A., Guatieri F., Haider S., Hinterberger A., Holmestad H., Kellerbauer A., Khalidova O., Krasnicky D., Lagomarsino V., Lansonneur P., Lebrun P., Malbrunot C., Mariazzi S., Marton J., Matveev V., Mazzotta Z., Muller S.R., Nebbia G., Nedelec P., Oberthaler M., Pacifico N., Penasa L., Petracek V., Prelz F., Prevedelli M., Ravelli L., Rienaecker B., Robert J., Rohne O.M., Rotondi A., Sandaker H., Santoro R., Smestad L., Sorrentino F., Testera G., Tietje I.C., Widmann E., Yzombard P., Zimmer C., Zmeskal J., and Zurlo N.
Subjects: History, Particle physics, Physics::General Physics, experimental methods, CERN Lab, General relativity, Measure (physics), 01 natural sciences, Education, Gravitational field, 0103 physical sciences, Physics::Atomic and Molecular Clusters, general relativity, antimatter, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Equivalence principle, 010306 general physics, Antihydrogen, Physics, antihydrogen, Large Hadron Collider, General Relativity and Cosmology, 010308 nuclear & particles physics, atom, gravitation: interaction, Computer Science Applications, experimental equipment, equivalence principle, Antimatter, force: gravitation, [PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc], gravity, antimatter, Particle Physics - Experiment, Beam (structure), experimental results
Abstract: From the experimental point of view, very little is known about the gravitational interaction between matter and antimatter. In particular, the Weak Equivalence Principle, which is of paramount importance for the General Relativity, has not yet been directly probed with antimatter. The main goal of the AEgIS experiment at CERN is to perform a direct measurement of the gravitational force on antimatter. The idea is to measure the vertical displacement of a beam of cold antihydrogen atoms, traveling in the gravitational field of the Earth, by the means of a moiré deflectometer. An overview of the physics goals of the experiment, of its apparatus and of the first results is presented.
Published: 2020

5. Developments for pulsed antihydrogen production towards direct gravitational measurement on antimatter

Author: Alberto Rotondi, S. Müller, G. Nebbia, Davide Pagano, O. Khalidova, Massimo Caccia, L. Povolo, Giovanni Consolati, V. Toso, Germano Bonomi, Heidi Sandaker, V. Petráček, A. Hinterberger, L. T. Glöggler, Sebastiano Mariazzi, B. Rienäcker, C. Zimmer, L. Di Noto, Marco Giammarchi, Marco Prevedelli, M. Antonello, Chloé Malbrunot, G. Testera, Angela Gligorova, Ole Røhne, Nicola Zurlo, Sebastian Gerber, Fabrizio Castelli, Alban Kellerbauer, A. S. Belov, I. C. Tietje, D. Krasnicky, V. Lagomarsino, M. Fanì, L. Nowak, Romualdo Santoro, Michael Doser, Patrick Nedelec, E. Oswald, J. Fesel, V. Matveev, S. Haider, P. Cheinet, A. Demetrio, F. Guatieri, Luca Penasa, A. Camper, F. Prelz, Daniel Comparat, Ruggero Caravita, T. Wolz, Markus K. Oberthaler, R. S. Brusa, Rafael Ferragut, Fani M., Antonello M., Belov A., Bonomi G., Brusa R.S., Caccia M., Camper A., Caravita R., Castelli F., Comparat D., Cheinet P., Consolati G., Demetrio A., Di Noto L., Doser M., Ferragut R., Fesel J., Gerber S., Giammarchi M., Gligorova A., Gloggler L.T., Guatieri F., Haider S., Hinterberger A., Kellerbauer A., Khalidova O., Krasnicky D., Lagomarsino V., Malbrunot C., Nowak L., Mariazzi S., Matveev V., Muller S.R., Nebbia G., Nedelec P., Oberthaler M., Oswald E., Pagano D., Penasa L., Petracek V., Povolo L., Prelz F., Prevedelli M., Rienacker B., Rohne O.M., Rotondi A., Sandaker H., Santoro R., Testera G., Tietje I.C., Toso V., Wolz T., Zimmer C., Zurlo N., Laboratoire Aimé Cotton (LAC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Gravity (chemistry), Physics::General Physics, Antimatter, experimental methods, Gravity, Antiproton, magnetic field, Positronium, 01 natural sciences, 010305 fluids & plasmas, Nuclear physics, Gravitation, temperature: low, 0103 physical sciences, general relativity, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Atomic and Molecular Clusters, Physics::Atomic Physics, 010306 general physics, Antihydrogen, Mathematical Physics, Physics, gravitation: interaction, antihydrogen: production, talk: Kolymbari 2019/08/21, sensitivity, charge exchange, Condensed Matter Physics, pulsed, Atomic and Molecular Physics, and Optics, anti-p, equivalence principle, gravitation: acceleration, gravitation: local, experimental results
Abstract: International audience; A main scientific goal of the experiment is the direct measurement of the Earth’s local gravitational acceleration g on antihydrogen. The Weak Equivalence Principle is a foundation of General Relativity. It has been extensively tested with ordinary matter but very little is known about the gravitational interaction between matter and antimatter. Antihydrogen is produced in via resonant charge-exchange reaction between cold Rydberg-excited positronium and cooled down antiprotons. The achievements for the development of a pulsed cold antihydrogen source are presented. Large number of antiprotons, necessary for a significant production rate of antihydrogen, are captured, accumulated, compressed and cooled over an extended period of time. Positronium (Ps) is formed through e$^{+}$-Ps conversion in a silica porous target at 10 K temperature in a reflection geometry inside the main apparatus. The so-formed Ps cloud is then laser-excited to Rydberg levels, for the first time in a 1 T magnetic field. Consequently, a detailed characterization of the Ps source for antihydrogen production in magnetic field needed to be performed. Several detection techniques are extensively used to monitor antiproton and positron manipulations in the formation process of antihydrogen inside the main apparatus. Positronium detection techniques underwent extensive improvements in sensitivity during the last antiproton run. At the same time, major efforts to improve integrate and commission the detectors sensitive to antihydrogen production took place.
Published: 2020

6. A cryogenic tracking detector for antihydrogen detection in the AEgIS experiment

Author: J. Wuethrich, Alberto Rotondi, Daniel Comparat, O. Khalidova, Alban Kellerbauer, Ole Røhne, P.A. Ekman, G. Testera, G. Nebbia, Davide Pagano, P. Hackstock, Marco Prevedelli, M. Antonello, Fabrizio Castelli, A. Camper, Sebastian Gerber, Massimo Caccia, D. Haider, C. Zimmer, Michael Doser, F. Prelz, I. C. Tietje, L. Nowak, Heidi Sandaker, Sebastiano Mariazzi, A. Hinterberger, S. Haider, F. Guatieri, Romualdo Santoro, Marco Giammarchi, A. S. Belov, Rafael Ferragut, D. Krasnický, J. Robert, A. Demetrio, Chloé Malbrunot, V. Toso, P. Yzombard, Giovanni Consolati, Germano Bonomi, L. Di Noto, V. Lagomarsino, James William Storey, Claude Amsler, T. Wolz, S.R. Müller, Ruggero Caravita, V. A. Matveev, B. Rienaecker, Luca Penasa, M. Oberthaler, Roberto S. Brusa, V. Petracek, Angela Gligorova, Patrick Nedelec, Nicola Zurlo, M. Fanì, E. Oswald, Laboratoire Aimé Cotton (LAC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Amsler, C., Antonello, M., Belov, A., Bonomi, G., Brusa, R.S., Caccia, M., Camper, A., Caravita, R., Castelli, F., Comparat, D., Consolati, G., Demetrio, A., Di Noto, L., Doser, M., Ekman, P.A., Fanì, M., Ferragut, R., Gerber, S., Giammarchi, M., Gligorova, A., Guatieri, F., Hackstock, P., Haider, D., Haider, S., Hinterberger, A., Kellerbauer, A., Khalidova, O., Krasnický, D., Lagomarsino, V., Malbrunot, C., Mariazzi, S., Matveev, V., Müller, S.R., Nebbia, G., Nedelec, P., Nowak, L., Oberthaler, M., Oswald, E., Pagano, D., Penasa, L., Petracek, V., Prelz, F., Prevedelli, M., Rienaecker, B., Robert, J., Røhne, O.M., Rotondi, A., Sandaker, H., Santoro, R., Storey, J., Testera, G., Tietje, I.C., Toso, V., Wolz, T., Wuethrich, J., Yzombard, P., Zimmer, C., Zurlo, N., École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics - Instrumentation and Detectors, Atomic Physics (physics.atom-ph), Physics::Instrumentation and Detectors, Antiproton, Cryogenics, Antihydrogen, Antimatter, Cryogenic tracker, Gravity, Positron, Scintillator detector, Tracking (particle physics), 01 natural sciences, High Energy Physics - Experiment, Physics - Atomic Physics, High Energy Physics - Experiment (hep-ex), tracking detector, Physics::Atomic Physics, Detectors and Experimental Techniques, Instrumentation, time resolution, Physics, Detector, Instrumentation and Detectors (physics.ins-det), cryogenics, performance, Nuclear and High Energy Physics, antihydrogen: annihilation, FOS: Physical sciences, Superconducting magnet, Silicon photomultiplier, Optics, 0103 physical sciences, Physics::Atomic and Molecular Clusters, scintillation counter: fibre, photomultiplier: silicon, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, detector: design, activity report, antimatter, gravity, 010308 nuclear & particles physics, business.industry, Physics::Accelerator Physics, business, pi: particle identification
Abstract: We present the commissioning of the Fast Annihilation Cryogenic Tracker detector (FACT), installed around the antihydrogen production trap inside the 1 T superconducting magnet of the AEgIS experiment. FACT is designed to detect pions originating from the annihilation of antiprotons. Its 794 scintillating fibers operate at 4K and are read out by silicon photomultipliers (MPPCs) at near room temperature. FACT provides the antiproton/antihydrogen annihilation position information with a few ns timing resolution. We present the hardware and software developments which led to the successful operation of the detector for antihydrogen detection and the results of an antiproton-loss based efficiency assessment. The main background to the antihydrogen signal is that of the positrons impinging onto the positronium conversion target and creating a large amount of gamma rays which produce a sizeable signal in the MPPCs shortly before the antihydrogen signal is expected. We detail the characterization of this background signal and its impact on the antihydrogen detection efficiency. We present the commissioning of the Fast Annihilation Cryogenic Tracker detector (FACT), installed around the antihydrogen production trap inside the 1 T superconducting magnet of the AEḡIS experiment. FACT is designed to detect pions originating from the annihilation of antiprotons. Its 794 scintillating fibers operate at 4 K and are read out by silicon photomultipliers (MPPCs) at near room temperature. FACT provides the antiproton/antihydrogen annihilation position information with a few ns timing resolution. We present the hardware and software developments which led to the successful operation of the detector for antihydrogen detection and the results of an antiproton-loss based efficiency assessment. The main background to the antihydrogen signal is that of the positrons impinging onto the positronium conversion target and creating a large amount of gamma rays which produce a sizeable signal in the MPPCs shortly before the antihydrogen signal is expected. We detail the characterization of this background signal and its impact on the antihydrogen detection efficiency.
Published: 2020

7. Efficient 2S3 positronium production by stimulated decay from the 3P3 level

Author: R. S. Brusa, P. Hackstock, E. Widmann, B. Rienaecker, Heidi Sandaker, S. Haider, M. Fanì, A. Hinterberger, V. Matveev, Ph. Lebrun, Sebastian Gerber, Daniel Comparat, A. S. Belov, Ole Røhne, Ruggero Caravita, Patrick Nedelec, E. Oswald, M. Antonello, C. Zimmer, I. C. Tietje, G. Testera, S. Müller, Alban Kellerbauer, Luca Penasa, Fabrizio Castelli, Giovanni Consolati, Germano Bonomi, A. Camper, Michael Doser, Alberto Rotondi, F. Prelz, Nicola Zurlo, P. Yzombard, Chloé Malbrunot, M. Oberthaler, Angela Gligorova, G. Nebbia, Romualdo Santoro, Davide Pagano, Sebastiano Mariazzi, V. Lagomarsino, Giovanni Cerchiari, F. Guatieri, L. Di Noto, T. Wolz, D. Krasnický, A. Demetrio, J. Robert, Massimo Caccia, V. Petráček, and O. Khalidova
Subjects: Spontaneous decay, Physics, Pulse (signal processing), Branching fraction, Ir laser, Production efficiency, 01 natural sciences, 7. Clean energy, 010305 fluids & plasmas, Positronium, 0103 physical sciences, Atomic physics, Experimental methods, 010306 general physics, Intensity (heat transfer)
Abstract: We investigate experimentally the possibility of enhancing the production of 2S3 positronium atoms by driving the 1S3–3P3 and 3P3–2S3 transitions, overcoming the natural branching ratio limitation of spontaneous decay from 3P3 to 2S3. The decay of 3P3 positronium atoms toward the 2S3 level has been efficiently stimulated by a 1312.2 nm broadband IR laser pulse. The dependence of the stimulating transition efficiency on the intensity of the IR pulse has been measured to find the optimal enhancement conditions. A maximum relative increase of ×(3.1±1.0) in the 2S3 production efficiency, with respect to the case in which only spontaneous decay is present, was obtained.
Published: 2019

8. Correction to: Compression of a mixed antiproton and electron non-neutral plasma to high densities

Author: S.R. Müller, Romualdo Santoro, G. Nebbia, Daniel Comparat, Davide Pagano, H. Holmestad, Marco Prevedelli, M. Antonello, C. Zimmer, A. Hinterberger, I. C. Tietje, D. Krasnický, A. Demetrio, Sebastiano Mariazzi, C. Evans, Rafael Ferragut, Claude Amsler, O. Khalidova, G. Testera, Markus K. Oberthaler, Nicola Zurlo, Angela Gligorova, L. Smestad, B. Rienaecker, Vojtech Petracek, Luca Penasa, Patrick Nedelec, Sebastian Gerber, Johann Marton, Stefano Aghion, Fabrizio Castelli, Massimo Caccia, Johann Zmeskal, Michael Doser, Giovanni Cerchiari, F. Prelz, Victor Matveev, F. Guatieri, Nicola Pacifico, P. Lansonneur, Adriano Fontana, S. Haider, Roberto S. Brusa, Giovanni Consolati, Germano Bonomi, Lea Di Noto, P. Yzombard, J. Robert, M. Fanì, Ruggero Caravita, Ole Røhne, Fiodor Sorrentino, Eberhard Widmann, V. Lagomarsino, J. Fesel, Chloé Malbrunot, Heidi Sandaker, Patrice Lebrun, Marco Giammarchi, Z. Mazzotta, Alban Kellerbauer, and Alberto Rotondi
Subjects: Political science, European research, Technical university, media_common.cataloged_instance, Library science, Christian ministry, Russian federation, European Social Fund, European union, Atomic and Molecular Physics, and Optics, Excellence initiative, Quality enhancement, media_common
Abstract: This correction provides updated acknowledgements: This work was supported by Istituto Nazionale di Fisica Nucleare; the Swiss National Science Foundation Ambizione Grant (No. 154833); a Deutsche Forschungsgemeinschaft research grant; an excellence initiative of Heidelberg University; Marie Sklodowska-Curie Innovative Training Network Fellowship of the European Commission’s Horizon 2020 Programme (No. 721559 AVA); European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement ANGRAM No 748826; European Research Council under the European Union’s Seventh Framework Program FP7/2007-2013 (Grants Nos. 291242 and 277762); Austrian Ministry for Science, Research, and Economy; Research Council of Norway; Bergen Research Foundation; John Templeton Foundation; Ministry of Education and Science of the Russian Federation and Russian Academy of Sciences; and the European Social Fund within the framework of realizing the project, in support of intersectoral mobility and quality enhancement of research teams at Czech Technical University in Prague (Grant No. CZ.1.07/2.3.00/30.0034).
Published: 2019

9. Techniques for Production and Detection of $2^3S$ Positronium

Author: Eberhard Widmann, V. Lagomarsino, S.R. Müller, Marco Prevedelli, M. Antonello, I. C. Tietje, Sebastiano Mariazzi, Ole Røhne, Ruggero Caravita, F. Prelz, M. Fanì, V. A. Matveev, Luca Penasa, Alban Kellerbauer, A. S. Belov, Massimo Caccia, Daniel Comparat, P. Lebrun, Giovanni Consolati, Germano Bonomi, Giovanni Cerchiari, Nicola Zurlo, E. Oswald, J. Fesel, P. Hackstock, B. Rienäcker, Roberto S. Brusa, Romualdo Santoro, T. Wolz, Chloé Malbrunot, V. Petracek, M. Oberthaler, O. Khalidova, Angela Gligorova, J. Robert, Patrick Nedelec, D. Krasnicky, Davide Pagano, C. Zimmer, A. Camper, Sebastian Gerber, A. Demetrio, A. Hinterberger, F. Guatieri, A. Vespertini, P. Yzombard, Di Noto, Alberto Rotondi, Heidi Sandaker, S. Haider, G. Testera, Fabrizio Castelli, Michael Doser, G. Nebbia, Laboratoire Aimé Cotton (LAC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: 010302 applied physics, Nuclear physics, Materials science, Physics in General, 0103 physical sciences, General Physics and Astronomy, Production (economics), 02 engineering and technology, 021001 nanoscience & nanotechnology, 0210 nano-technology, 01 natural sciences, [PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph], Positronium
Abstract: International audience; In this work, we show recent measurements of $2^{3}S$ long-lived positronium production via spontaneous decay from the 3 3P level. The possibility to tune the velocity of the $2^{3}S$ positronium, excited following this scheme, is presented. In the light of these results, we discuss the use of the $3^{3}P$→ $2^{3}S$ transition to realize a monochromatic pulsed $2^{3}S$ positronium beam with low angular divergence. Preliminary tests of $2^{3}S$ beam production are presented. The possibility to overcome the natural $3^{3}P$ → $2^{3}S$ branching ratio via stimulated emission, and thus increasing the intensity of the $2^{3}S$ source, is also shown. A position-sensitive detector for a pulsed beam of positronium, with spatial resolution of ≈ 90 $\mu m$, is finally described in view of its possible application for the spatial characterization of the $2^{3}S$ beam
Published: 2019

10. Calibration and Equalisation of Plastic Scintillator Detectors for Antiproton Annihilation Identification Over Positron/Positronium Background

Author: Ole Røhne, F. Prelz, G. Nebbia, S. Haider, D. Krasnicky, B. Rienaecker, Daniel Comparat, C. Zimmer, G. Testera, P. Yzombard, Claude Amsler, Giovanni Consolati, Germano Bonomi, Sebastiano Mariazzi, Massimo Caccia, V. Toso, Ruggero Caravita, Luca Penasa, A. Hinterberger, Fabrizio Castelli, Michael Doser, T. Wolz, V. Matveev, Roberto S. Brusa, Marco Giammarchi, Giovanni Cerchiari, V. Petracek, L. Di Noto, L. T. Glöggler, Rafael Ferragut, Alban Kellerbauer, Chloé Malbrunot, V. Lagomarsino, A. Demetrio, Alberto Rotondi, Davide Pagano, Heidi Sandaker, Sebastian Gerber, F. Guatieri, A. Camper, M. Oberthaler, Angela Gligorova, Patrick Nedelec, M. Fanì, E. Oswald, Romualdo Santoro, Marco Prevedelli, M. Antonello, I. C. Tietje, A. S. Belov, O. Khalidova, S. Müller, Nicola Zurlo, Laboratoire Aimé Cotton (LAC), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Zurlo N., Amsler C., Antonello M., Belov A., Bonomi G., Brusa R.S., Caccia M., Camper A., Caravita R., Castelli F., Cerchiari G., Comparat D., Consolati G., Demetrio A., Di Noto L., Doser M., Fani M., Ferragut R., Gerber S., Giammarchi M., Gligorova A., Gloggler L., Guatieri F., Haider S., Hinterberger A., Kellerbauer A., Khalidova O., Krasnicky D., Lagomarsino V., Malbrunot C., Mariazzi S., Matveev V., Muller S.R., Nebbia G., Nedelec P., Oberthaler M., Oswald E., Pagano D., Penasa L., Petracek V., Prelz F., Prevedelli M., Rienaecker B., Rohne O.M., Rotondi A., Sandaker H., Santoro R., Testera G., Tietje I.C., Toso V., Wolz T., Yzombard P., and Zimmer C.
Subjects: Physics::Instrumentation and Detectors, positronium: annihilation, General Physics and Astronomy, positron: annihilation, scintillation counter: plastics, Scintillator, 01 natural sciences, Positronium, Nuclear physics, Positron, Positronium, Particle detectors, 0103 physical sciences, Calibration, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Detectors and Experimental Techniques, 010306 general physics, Physics, Annihilation, photomultiplier, 010308 nuclear & particles physics, background, Detector, calibration, Identification (information), Antiproton, cosmic radiation, Scintillators, numerical calculations: Monte Carlo
Abstract: International audience; In this contribution, the system of the external plastic scintillator slabs of the AEgIS experiment is presented. These slabs, surrounding the superconducting magnet and operating at room temperature, are read out by photomultiplier tubes (PMTs) that are calibrated and equalised to be exploited as a whole detector with useful segmentation and redundancy to effectively detect single antiparticle annihilations. In particular, thanks to periodically recurring calibrations with cosmic rays and to a detailed study of the system in different operational conditions, including extensive Monte Carlo (MC) simulations, these scintillators can be used to identify antiproton annihilations over the constant background represented by cosmic rays and over the strongly time-dependent background due to positrons/positronium annihilations. By means of the sampling and digitization of the analog signal produced by each phototube and the consequent analysis of the amplitude of the recorded events, the energy released by the particle in the scintillator slab can be estimated consistently and with good accuracy. As a consequence, we are able to identify an amplitude range where positrons/positronium annihilations can be univocally excluded. This prerequisite allows us to exploit the array of external plastic scintillators for antihydrogen annihilations tagging.
Published: 2019

11. Velocity-selected production of 2S3 metastable positronium

Author: R. S. Brusa, Giovanni Consolati, Germano Bonomi, P. Hackstock, Ph. Lebrun, H. Holmestad, D. Krasnický, A. Demetrio, Giovanni Cerchiari, Ruggero Caravita, Claude Amsler, G. Nebbia, G. Testera, S. Haider, V. Matveev, Ole Røhne, Sebastian Gerber, Alban Kellerbauer, M. Fanì, Heidi Sandaker, J. Robert, Fabrizio Castelli, L. Di Noto, M. Oberthaler, F. Prelz, B. Rienaecker, Chloé Malbrunot, E. Widmann, Felice Sorrentino, Sebastiano Mariazzi, Michael Doser, Luca Penasa, Angela Gligorova, Marco Prevedelli, M. Antonello, Alberto Rotondi, I. C. Tietje, S. Müller, Daniel Comparat, Patrick Nedelec, F. Guatieri, Romualdo Santoro, Massimo Caccia, O. Khalidova, P. Lansonneur, A. S. Belov, C. Zimmer, V. Petráček, Lillian Smestad, Davide Pagano, V. Lagomarsino, Nicola Zurlo, A. Camper, A. Hinterberger, and P. Yzombard
Subjects: Physics, Branching fraction, 01 natural sciences, 7. Clean energy, 010305 fluids & plasmas, Positronium, Pulse (physics), Positron, Polarizability, Electric field, Metastability, 0103 physical sciences, Production (computer science), Physics::Atomic Physics, Atomic physics, 010306 general physics
Abstract: Positronium in the $2^3S$ metastable state exhibits a low electrical polarizability and a long lifetime (1140 ns) making it a promising candidate for interferometry experiments with a neutral matter-antimatter system. In the present work, $2^3S$ positronium is produced - in absence of electric field - via spontaneous radiative decay from the $3^3P$ level populated with a 205nm UV laser pulse. Thanks to the short temporal length of the pulse, 1.5 ns full-width at half maximum, different velocity populations of a positronium cloud emitted from a nanochannelled positron/positronium converter were selected by delaying the excitation pulse with respect to the production instant. $ 2^3S $ positronium atoms with velocity tuned between $ 7 \cdot 10^4 $ m/s and $ 10 \cdot 10^4 $ m/s were thus produced. Depending on the selected velocity, a $2^3S$ production effciency ranging from $\sim 0.8 \%$ to $\sim 1.7%$, with respect to the total amount of emitted positronium, was obtained. The observed results give a branching ratio for the $3^3P$-$2^3S$ spontaneous decay of $(9.7 \pm 2.7) \% $. The present velocity selection technique could allow to produce an almost monochromatic beam of $\sim 1 \cdot 10^3 $ $2^3S$ atoms with a velocity spread $ < 10^4 $ m/s and an angular divergence of $\sim$ 50 mrad.
Published: 2019

12. A ∼100 μm-resolution position-sensitive detector for slow positronium

Author: Chloé Malbrunot, Alban Kellerbauer, Giovanni Consolati, Germano Bonomi, Ruggero Caravita, P. Hackstock, T. Wolz, R. S. Brusa, G. Nebbia, Patrick Nedelec, A. Camper, Claude Amsler, V. A. Matveev, Sebastian Gerber, O. Khalidova, F. Guatieri, J. Fesel, A. Hinterberger, A. S. Belov, M. Oberthaler, Luca Penasa, Angela Gligorova, Marco Prevedelli, M. Antonello, M. Fanì, I. C. Tietje, Marco Giammarchi, S. Haider, Sebastiano Mariazzi, Daniel Comparat, B. Rienaecker, Massimo Caccia, E. Oswald, Rafael Ferragut, Davide Pagano, P. Yzombard, Ole Røhne, F. Prelz, G. Testera, Nicola Zurlo, C. Zimmer, P. Lebrun, Fabrizio Castelli, V. Petráček, Michael Doser, J. Robert, Eberhard Widmann, V. Lagomarsino, L. Di Noto, Heidi Sandaker, Alberto Rotondi, S.R. Müller, Romualdo Santoro, Giovanni Cerchiari, D. Krasnický, A. Demetrio, Amsler, C., Antonello, M., Belov, A., Bonomi, G., Brusa, R.S., Caccia, M., Camper, A., Caravita, R., Castelli, F., Cerchiari, G., Comparat, D., Consolati, G., Demetrio, A., Di Noto, L., Doser, M., Fanì, M., Ferragut, R., Fesel, J., Gerber, S., Giammarchi, M., Gligorova, A., Guatieri, F., Hackstock, P., Haider, S., Hinterberger, A., Kellerbauer, A., Khalidova, O., Krasnický, D., Lagomarsino, V., Lebrun, P., Malbrunot, C., Mariazzi, S., Matveev, V., Müller, S.R., Nebbia, G., Nedelec, P., Oberthaler, M., Oswald, E., Pagano, D., Penasa, L., Petracek, V., Prelz, F., Prevedelli, M., Rienaecker, B., Robert, J., Røhne, O.M., Rotondi, A., Sandaker, H., Santoro, R., Testera, G., Tietje, I.C., Widmann, E., Wolz, T., Yzombard, P., Zimmer, C., Zurlo, N., Laboratoire Aimé Cotton (LAC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Detector, Photoionization, Positronium, 01 natural sciences, Magnetic field, Imaging, Positron, Ionization, Excited state, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Microchannel plate detector, Positronium, Imaging, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Physics::Atomic Physics, Atomic physics, Physics::Chemical Physics, 010306 general physics, Instrumentation
Abstract: In this work we describe a high-resolution position-sensitive detector for positronium. The detection scheme is based on the photoionization of positronium in a magnetic field and the imaging of the freed positrons with a Microchannel Plate assembly. A spatial resolution of ( 88 ± 5 ) μm on the position of the ionized positronium –in the plane perpendicular to a 1.0 T magnetic field– is obtained. The possibility to apply the detection scheme for monitoring the emission into vacuum of positronium from positron/positronium converters, imaging positronium excited to a selected state and characterizing its spatial distribution is discussed. Ways to further improve the spatial resolution of the method are presented.
Published: 2019

13. Positronium Rydberg excitation diagnostic in a 1T cryogenic environment

Author: Ole Røhne, Johann Marton, Chloé Malbrunot, B. Rienaecker, Davide Pagano, P. Hackstock, M. Fanì, Giovanni Consolati, Germano Bonomi, S. Müller, R. S. Brusa, M. Vujanovic, A. Camper, G. Nebbia, S. Haider, V. Matveev, Patrick Nedelec, Sebastiano Mariazzi, Johann Zmeskal, C. Zimmer, A. Hinterberger, Ruggero Caravita, E. Widmann, A. S. Belov, O. Khalidova, Marco Giammarchi, Marco Prevedelli, M. Antonello, Lillian Smestad, I. C. Tietje, Fabrizio Castelli, Stefano Aghion, Alban Kellerbauer, Romualdo Santoro, Michael Doser, Claude Amsler, Ph. Lebrun, H. Holmestad, Rafael Ferragut, M. Oberthaler, G. Testera, Angela Gligorova, F. Prelz, J. Robert, P. Yzombard, Felice Sorrentino, Nicola Zurlo, Daniel Comparat, D. Krasnický, A. Demetrio, C. Evans, Andrea Fontana, Giovanni Cerchiari, Massimo Caccia, Luca Penasa, Heidi Sandaker, V. Petráček, Alberto Rotondi, L. Di Noto, Sebastian Gerber, F. Guatieri, P. Lansonneur, V. Lagomarsino, J. Fesel, Caravita R., Mariazzi S., Aghion S., Amsler C., Antonello M., Belov A., Bonomi G., Brusa R.S., Caccia M., Camper A., Castelli F., Cerchiari G., Comparat D., Consolati G., Demetrio A., Di Noto L., Doser M., Evans C., Fani M., Ferragut R., Fesel J., Fontana A., Gerber S., Giammarchi M., Gligorova A., Guatieri F., Hackstock P., Haider S., Hinterberger A., Holmestad H., Kellerbauer A., Khalidova O., Krasnicky D., Lagomarsino V., Lansonneur P., Lebrun P., Malbrunot C., Marton J., Matveev V., Muller S.R., Nebbia G., Nedelec P., Oberthaler M., Pagano D., Penasa L., Petracek V., Prelz F., Prevedelli M., Rienaecker B., Robert J., Rohne O.M., Rotondi A., Sandaker H., Santoro R., Smestad L., Sorrentino F., Testera G., Tietje I.C., Vujanovic M., Widmann E., Yzombard P., Zimmer C., Zmeskal J., and Zurlo N.
Subjects: positronium, spectroscopy, Materials science, Laser, Positronium, law.invention, symbols.namesake, law, Antimatter, Field desorption, Rydberg formula, symbols, Physics::Atomic Physics, Atomic physics, Spectroscopy, Antihydrogen, Excitation
Abstract: Forming a pulsed beam of cold antihydrogen using charge-exchange with Rydberg positronium (Ps) is the goal of the AEgIS collaboration, which aims to a first gravity measurement on neutral antimatter. Recently achieved results in Ps formation and laser spectroscopy in the main AEgIS apparatus are summarized. First, Ps has been produced using nanochanneled silicon targets in a cryogenic environment (~ 15 K) with 1 T magnetic field and observed by means of Single-Shot Positron Annihilation Lifetime Spectroscopy. The first demonstration of Ps n=3 excitation has been obtained as well using the same technique, validating the proof-of-concept of AEgIS. Subsequently, a new fast and high sensitivity detection method for laser-excited Ps in high magnetic field has been developed, using the combination of laser/field ionization and an high sensitivity MCP detector coupled to a low-noise CMOS camera. This technique will form the basis of future experiments involving Rydberg Ps spectroscopy in AEgIS.
Published: 2019

14. Efficient 2 S 3 positronium production by stimulated decay from the 3

Author: M. Antonello, A. Belov, G. Bonomi, R. S. Brusa, M. Caccia, A. Camper, R. Caravita, F. Castelli, G. Cerchiari, D. Comparat, G. Consolati, A. Demetrio, L. Di Noto, M. Doser, M. Fanì, S. Gerber, A. Gligorova, F. Guatieri, P. Hackstock, S. Haider, A. Hinterberger, A. Kellerbauer, O. Khalidova, D. Krasnický, V. Lagomarsino, P. Lebrun, C. Malbrunot, S. Mariazzi, V. Matveev, S. R. Müller, G. Nebbia, P
Published: 2019
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15. Imaging a positronium cloud in a 1 Tesla

Author: Stefano Aghion, P. Hackstock, G. Nebbia, Alban Kellerbauer, A. Hinterberger, Sebastian Gerber, Rafael Ferragut, Ruggero Caravita, Daniel Comparat, Marco Prevedelli, M. Antonello, D. Krasnický, A. Demetrio, Sebastiano Mariazzi, F. Guatieri, A. M. Belov, I. C. Tietje, C. Evans, Markus K. Oberthaler, Roberto S. Brusa, B. Rienaecker, L. Smestad, F. Sorrentino, Giovanni Consolati, Chloé Malbrunot, M. Vujanovic, Germano Bonomi, Johann Marton, S. Haider, J. Robert, M. Fanì, Marco Giammarchi, F. Prelz, Heidi Sandaker, Giovanni Cerchiari, Angela Gligorova, Luca Penasa, P. Lebrun, Patrick Nedelec, Lea Di Noto, Johann Zmeskal, Davide Pagano, P. Yzombard, P. Lansonneur, A. Camper, C. Zimmer, Alberto Rotondi, G. Testera, Adriano Fontana, Fabrizio Castelli, Michael Doser, H. Holmestad, O. Khalidova, Claude Amsler, Vojtech Petracek, S.R. Müller, Romualdo Santoro, Nicola Zurlo, Viktor Matveev, J. Fesel, Ole Røhne, Massimo Caccia, Eberhard Widmann, V. Lagomarsino, Laboratoire Aimé Cotton (LAC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Camper, Antoine, Aghion, Stefano, Amsler, Claude, Antonello, Massimiliano, Belov, Alexander, Bonomi, Germano, Brusa, Roberto, Caccia, Massimo, Caravita, Ruggero, Castelli, Fabrizio, Cerchiari, Giovanni, Comparat, Daniel, Consolati, Giovanni, Demetrio, Andrea, Di Noto, Lea, Doser, Michael, Evans, Craig, Fanì, Mattia, Ferragut, Rafael, Fesel, Julian, Fontana, Andrea, Gerber, Sebastian, Giammarchi, Marco, Gligorova, Angela, Guatieri, Francesco, Hackstock, Philip, Haider, Stefan, Hinterberger, Alexander, Holmestad, Helga, Kellerbauer, Alban, Khalidova, Olga, Krasnický, Daniel, Lagomarsino, Vittorio, Lansonneur, Pierre, Lebrun, Patrice, Malbrunot, Chloé, Mariazzi, Sebastiano, Marton, Johann, Matveev, Viktor, Müller, Simon, Nebbia, Giancarlo, Nedelec, Patrick, Oberthaler, Marku, Pagano, Davide, Penasa, Luca, Petracek, Vojtech, Prelz, Francesco, Prevedelli, Marco, Rienaecker, Benjamin, Robert, Jacque, Røhne, Ole, Rotondi, Alberto, Sandaker, Heidi, Santoro, Romualdo, Smestad, Lillian, Sorrentino, Fiodor, Testera, Gemma, Tietje, Ingmari, Vujanovic, Milena, Widmann, Eberhard, Yzombard, Pauline, Zimmer, Christian, Zmeskal, Johann, Zurlo, Nicola, École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: QC1-999, measurement methods, positronium, Cloud computing, Photoionization, talk: Paris 2018/09/05, 7. Clean energy, 01 natural sciences, 010305 fluids & plasmas, Positronium, law.invention, Nuclear physics, Positron, law, 0103 physical sciences, antimatter, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Atomic and Molecular Clusters, cloud, Physics::Atomic Physics, 010306 general physics, Spectroscopy, Antihydrogen, Physics, business.industry, background, antihydrogen: production, imaging, Laser, charge exchange, laser, Antimatter, positronium, gravity, positron, business, Particle Physics - Experiment, experimental results
Abstract: International audience; We report on recent developments in positronium work in the frame of antihydrogen production through charge exchange in the AEgIS collaboration [1]. In particular, we present a new technique based on spatially imaging a cloud of positronium by collecting the positrons emitted by photoionization. This background free diagnostic proves to be highly efficient and opens up new opportunities for spectroscopy on antimatter, control and laser manipulation of positronium clouds as well as Doppler velocimetry.
Published: 2019

16. Production of long-lived positronium states via laser excitation to 33P level

Author: A. Camper, Sebastian Gerber, J. Fesel, R. S. Brusa, F. Guatieri, P. Lansonneur, Romualdo Santoro, M. Oberthaler, G. Testera, Angela Gligorova, E. Widmann, O. M. Roehne, S. R. Mueller, Luca Penasa, B. Rienaecker, Stefano Aghion, Ph. Lebrun, H. Holmestad, F. Prelz, L. Di Noto, Claude Amsler, Felice Sorrentino, D. Krasnicky, Marco Prevedelli, M. Antonello, Daniel Comparat, Chloé Malbrunot, Rafael Ferragut, J. Robert, Andrea Fontana, I. C. Tietje, Massimo Caccia, Fabrizio Castelli, Michael Doser, V. Petráček, P. Hackstock, Marco Giammarchi, G. Nebbia, Giovanni Cerchiari, S. Haider, Davide Pagano, C. Zimmer, V. Matveev, O. Khalidova, Alban Kellerbauer, Alberto Rotondi, A. Hinterberger, V. Lagomarsino, A. S. Belov, Lillian Smestad, A. Demetrio, Patrick Nedelec, Sebastiano Mariazzi, M. Fanì, C. Evans, Ruggero Caravita, Giovanni Consolati, Germano Bonomi, P. Yzombard, Heidi Sandaker, Nicola Zurlo, Mariazzi S., Caravita R., Aghion S., Amsler C., Antonello M., Belov A., Bonomi G., Brusa R.S., Caccia M., Camper A., Castelli F., Cerchiari G., Comparat D., Consolati G., Demetrio A., Di Noto L., Doser M., Evans C., Fani M., Ferragut R., Fesel J., Fontana A., Gerber S., Giammarchi M., Gligorova A., Guatieri F., Hackstock P., Haider S., Hinterberger A., Holmestad H., Kellerbauer A., Khalidova O., Krasnicky D., Lagomarsino V., Lansonneur P., Lebrun P., Malbrunot C., Matveev V., Mueller S.R., Nebbia G., Nedelec P., Oberthaler M., Pagano D., Penasa L., Petracek V., Prelz F., Prevedelli M., Rienaecker B., Robert J., Roehne O.M., Rotondi A., Sandaker H., Santoro R., Smestad L., Sorrentino F., Testera G., Tietje I.C., Widmann E., Yzombard P., Zimmer C., and Zurlo N.
Subjects: positronium, spectroscopy, Physics, Laser, 01 natural sciences, 010305 fluids & plasmas, Positronium, law.invention, Interferometry, symbols.namesake, law, Metastability, 0103 physical sciences, Rydberg formula, symbols, Intermediate state, Atomic physics, 010306 general physics, Ground state, Excitation
Abstract: The 33P state of positronium is an intermediate level suitable for producing long-lived positronium states. On one hand, it can be used in a two-step laser excitation scheme from the ground state to Rydberg levels. On the other hand, excitation of positronium to 33P level is a simple pathway for producing metastable 23S positronium atoms by spontaneous radiactive decay. In this work, experiments showing the production of such long-lived levels, using the 33P state as intermediate state, are presented. The characteristics of the two long-lived levels, in view of experiments of deflectometry/interferometry with positronium, are discussed.The 33P state of positronium is an intermediate level suitable for producing long-lived positronium states. On one hand, it can be used in a two-step laser excitation scheme from the ground state to Rydberg levels. On the other hand, excitation of positronium to 33P level is a simple pathway for producing metastable 23S positronium atoms by spontaneous radiactive decay. In this work, experiments showing the production of such long-lived levels, using the 33P state as intermediate state, are presented. The characteristics of the two long-lived levels, in view of experiments of deflectometry/interferometry with positronium, are discussed.
Published: 2019

17. Velocity-selected production of 2 S 3 metastable positronium

Author: C. Amsler, M. Antonello, A. Belov, G. Bonomi, R. S. Brusa, M. Caccia, A. Camper, R. Caravita, F. Castelli, G. Cerchiari, D. Comparat, G. Consolati, A. Demetrio, L. Di Noto, M. Doser, M. Fanì, S. Gerber, A. Gligorova, F. Guatieri, P. Hackstock, S. Haider, A. Hinterberger, H. Holmestad, A. Kellerbauer, O. Khalidova, D. Krasnický, V. Lagomarsino, P. Lansonneur, P. Lebrun, C. Malbrunot, and S. Mariazzi
Published: 2019
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18. The AEgIS Experiment

Author: R. Vaccarone, S. Lehner, C. Regenfus, Paola Scampoli, James William Storey, M. A. Subieta Vasquez, A. Gligorova, V. Lagomarsino, C. Pistillo, F. Merkt, Ruggero Caravita, S. D. Hogan, Claude Amsler, P. Nédélec, M. Špaček, Davide Trezzi, Tomoko Ariga, G. Cerchiari, Nicola Pacifico, Heidi Sandaker, E. Jordan, S. Di Domizio, J. Bremer, Rafael Ferragut, S. Mariazzi, Alexey Dudarev, Giovanni Consolati, Marco Giammarchi, Germano Bonomi, T. Huse, Ole Røhne, Jiro Kawada, L. Di Noto, S. Haider, J. H. Derking, M. Kimura, D. Krasnický, Marco Prevedelli, Fabrizio Castelli, G. Testera, Cristina Riccardi, O. Ahlén, Michael Doser, Alban Kellerbauer, Sergei Gninenko, E. Widmann, A. Knecht, Johann Zmeskal, P. Genova, Antonio Ereditato, D. Comparat, Carlo Canali, Andrea Fontana, Thomas Kaltenbacher, Simone Cialdi, S. Zavatarelli, Akitaka Ariga, Stefano Aghion, Chloé Malbrunot, V. A. Matveev, V. Petráček, Alberto Rotondi, L. V. Jørgensen, L. Cabaret, R. S. Brusa, F. Prelz, G. Nebbia, A. S. Belov, P. Bräunig, F. Moia, M. Oberthaler, A., Knecht, S., Aghion, O., Ahlén, C., Amsler, A., Ariga, T., Ariga, A. S., Belov, G., Bonomi, P., Bräunig, J., Bremer, R. S., Brusa, L., Cabaret, C., Canali, R., Caravita, F., Castelli, G., Cerchiari, S., Cialdi, D., Comparat, G., Consolati, J. H., Derking, S., Di Domizio, L., Di Noto, M., Doser, A., Dudarev, A., Ereditato, R., Ferragut, A., Fontana, P., Genova, M., Giammarchi, A., Gligorova, S. N., Gninenko, S., Haider, S. D., Hogan, T., Huse, E., Jordan, L. V., Jørgensen, T., Kaltenbacher, J., Kawada, A., Kellerbauer, M., Kimura, D., Krasnický, V., Lagomarsino, S., Lehner, C., Malbrunot, S., Mariazzi, V. A., Matveev, F., Merkt, F., Moia, G., Nebbia, P., Nédélec, M. K., Oberthaler, N., Pacifico, V., Petráček, C., Pistillo, F., Prelz, M., Prevedelli, C., Regenfu, C., Riccardi, O., Røhne, A., Rotondi, H., Sandaker, Scampoli, Paola, J., Storey, M. A., Subieta Vasquez, M., Špaček, G., Testera, D., Trezzi, R., Vaccarone, E., Widmann, S., Zavatarelli, and J., Zmeskal
Subjects: Physics, Antimatter, Nuclear and High Energy Physics, business.industry, General relativity, Gravity, Detector, Condensed Matter Physics, Gravitational acceleration, Atomic and Molecular Physics, and Optics, Nuclear physics, Antihydrogen, Gravitational interaction of antimatter, Physical and Theoretical Chemistry, Aerospace engineering, business, Beam (structure), Antihydrogen, Antimatter, Gravity
Abstract: The AEgIS experiment aims at performing the first test of the Weak Equivalence Principle of General Relativity in the antimatter sector by measuring the gravitational acceleration acting on a beam of cold antihydrogen to a precision of 1 %. The installation of the apparatus is making good progress and large parts were taken into operation. Parasitic detector tests during the beamtime in December 2012 gave essential input for an optimal moir´e deflectometer and the detector layout necessary to perform the gravity measurement.
Published: 2014

19. Producing long-lived 23S positronium via 33P laser excitation in magnetic and electric fields

Author: Fabrizio Castelli, Giovanni Consolati, F. Sorrentino, Ole Røhne, F. Prelz, E. Widmann, P. Hackstock, D. Krasnický, J. Marton, Rafael Ferragut, G. Nebbia, Daniel Comparat, V. Petracek, M. Fanì, A. Kellerbauer, I. C. Tietje, A. Hinterberger, A. Gligorova, P. Nedelec, J. Robert, M. Vujanovic, S. Haider, Johann Zmeskal, Sebastian Gerber, D. Pagano, C. Zimmer, Luca Penasa, L. Smestad, V. N. Matveev, P. Lansonneur, F. Guatieri, Markus K. Oberthaler, B. Rienaecker, Marco Prevedelli, M. Antonello, Claude Amsler, Ruggero Caravita, A. Rotondi, J. Fesel, O. Khalidova, A. Camper, R. S. Brusa, A. Fontana, Heidi Sandaker, M. Doser, Z. Mazzotta, Marco Giammarchi, A. Demetrio, C. Evans, G. Bonomi, Giovanni Cerchiari, C. Malbrunot, A. S. Belov, L. Di Noto, Massimo Caccia, H. Holmestad, N. Zurlo, P. Yzombard, V. Lagomarsino, P. Lebrun, S.R. Müller, S. Aghion, Romualdo Santoro, S. Mariazzi, and G. Testera
Subjects: Physics, education.field_of_study, Population, 02 engineering and technology, 021001 nanoscience & nanotechnology, Laser, 01 natural sciences, Positronium, law.invention, Magnetic field, law, Electric field, Metastability, Excited state, 0103 physical sciences, Atomic physics, 010306 general physics, 0210 nano-technology, education, Excitation
Abstract: Producing positronium (Ps) in the metastable 23S state is of interest for various applications in fundamental physics. We report here on an experiment in which Ps atoms are produced in this long-lived state by spontaneous radiative decay of Ps excited to the 33P level manifold. The Ps cloud excitation is obtained with a UV laser pulse in an experimental vacuum chamber in presence of guiding magnetic field of 25mT and an average electric field of 300Vcm−1. The evidence of the 23S state production is obtained to the 3.6σ level of statistical significance using a novel analysis technique of the single-shot positronium annihilation lifetime spectra. The dynamic of the Ps population on the involved levels has been studied with a rate equation model.
Published: 2018

20. Antiproton tagging and vertex fitting in a Timepix3 detector

Author: Johann Zmeskal, L. Di Noto, Sebastian Gerber, P. Lansonneur, D. Pagano, V. Petracek, V. N. Matveev, F. Guatieri, C. Malbrunot, O. Khalidova, Ruggero Caravita, A. Rotondi, H. Holmestad, A. S. Belov, R. S. Brusa, Daniel Comparat, A. Gligorova, Massimo Caccia, A. Kellerbauer, Giovanni Cerchiari, Marco Prevedelli, M. Antonello, Heidi Sandaker, I. C. Tietje, F. Sorrentino, G. Bonomi, A. Camper, G. Testera, Claude Amsler, P. Nedelec, M. Doser, Fabrizio Castelli, Ph. Hackstock, F. Prelz, A. Hinterberger, Marco Giammarchi, S. Haider, S.R. Müller, J. Robert, A. Demetrio, L. Smestad, C. Evans, S. Aghion, N. Zurlo, G. Nebbia, Luca Penasa, P. Yzombard, A. Fontana, C. Zimmer, M. Fanì, Romualdo Santoro, S. Mariazzi, J. Fesel, J. Marton, P. Lebrun, V. Lagomarsino, Ole Røhne, Giovanni Consolati, D. Krasnický, Markus K. Oberthaler, B. Rienaecker, E. Widmann, Rafael Ferragut, Nicola Pacifico, Laboratoire Aimé Cotton (LAC), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), AEgIS, Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Aghion, S., Amsler, C., Antonello, M., Belov, A., Bonomi, G., Brusa, R.S., Caccia, M., Camper, A., Caravita, R., Castelli, F., Cerchiari, G., Comparat, D., Consolati, G., Demetrio, A., Noto, L. Di, Doser, M., Evans, C., Fanì, M., Ferragut, R., Fesel, J., Fontana, A., Gerber, S., Giammarchi, M., Gligorova, A., Guatieri, F., Hackstock, Ph., Haider, S., Hinterberger, A., Holmestad, H., Kellerbauer, A., Khalidova, O., Krasnický, D., Lagomarsino, V., Lansonneur, P., Lebrun, P., Malbrunot, C., Mariazzi, S., Marton, J., Matveev, V., Müller, S.R., Nebbia, G., Nedelec, P., Oberthaler, M., Pacifico, N., Pagano, D., Penasa, L., Petracek, V., Prelz, F., Prevedelli, M., Rienaecker, B., Robert, J., Røhne, O.M., Rotondi, A., Sandaker, H., Santoro, R., Smestad, L., Sorrentino, F., Testera, G., Tietje, I.C., Widmann, E., Yzombard, P., Zimmer, C., Zmeskal, J., and Zurlo, N.
Subjects: Vertex (graph theory), Physics::Instrumentation and Detectors, 01 natural sciences, Particle identification methods, Physics::Atomic Physics, Detectors and Experimental Techniques, Nuclear Experiment, Instrumentation, Image resolution, Mathematical Physics, media_common, Detector modelling and simulations I (interaction of radiation with matter, interaction of photons with matter, interaction of hadrons with matter, etc), Physics, Detector, Simulation methods and program, Hybrid detectors, Simulation methods and programs, interac- tion of photons with matter, interaction of photons with matter, Detector modelling and simulations I, interaction of hadrons with matter, force: gravitation, readout, asymmetry, Particle physics, Physics::General Physics, CERN Lab, media_common.quotation_subject, antihydrogen: annihilation, Detector modelling and simulations I (interaction of radiation with matter, Asymmetry, anti-p p: annihilation, Particle identification method, 0103 physical sciences, detector: pixel, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Antihydrogen, spatial resolution, etc), antihydrogen, detector: position sensitive, 010308 nuclear & particles physics, Hybrid detector, interaction of radiation with matter, efficiency, Antiproton, High Energy Physics::Experiment
Abstract: International audience; Studies of antimatter are important for understanding our universe at a fundamental level. There are still unsolved problems, such as the matter-antimatter asymmetry in the universe. The AEgIS experiment at CERN aims at measuring the gravitational fall of antihydrogen in order to determine the gravitational force on antimatter. The proposed method will make use of a position-sensitive detector to measure the annihilation point of antihydrogen. Such a detector must be able to tag the antiproton, measure its time of arrival and reconstruct its annihilation point with high precision in the vertical direction. This work explores a new method for tagging antiprotons and reconstructing their annihilation point. Antiprotons from the Antiproton Decelerator at CERN were used to obtain data on direct annihilations on the surface of a silicon pixel sensor with Timepix3 readout. These data were used to develop and verify a detector response model for annihilation of antiprotons in this detector. Using this model and the antiproton data it is shown that a tagging efficiency of 50± 10% and a vertical position resolution of 22 ± 0.5 μm can be obtained.
Published: 2018

21. AEgIS at ELENA: outlook for physics with a pulsed cold antihydrogen beam

Author: Giovanni Consolati, F. Sorrentino, J. Marton, H. Holmestad, M. Fanì, A. Kellerbauer, F. Prelz, Heidi Sandaker, Ole Røhne, O. Khalidova, Daniel Comparat, Massimo Caccia, G. Nebbia, R. S. Brusa, C. Malbrunot, I. C. Tietje, Marco Prevedelli, N. Zurlo, P. Yzombard, D. Krasnický, P. Nedelec, Z. Mazzotta, V. Petracek, G. Testera, P. Lebrun, J. Fesel, Fabrizio Castelli, L. Di Noto, Johann Zmeskal, G. Bonomi, E. Widmann, Rafael Ferragut, Claude Amsler, D. Pagano, S. Haider, V. Lagomarsino, A. Gligorova, S.R. Müller, Marco Giammarchi, S. Aghion, J. Robert, Romualdo Santoro, S. Mariazzi, Nicola Pacifico, Luca Penasa, A. Demetrio, C. Zimmer, C. Evans, Giovanni Cerchiari, Ruggero Caravita, P. Lansonneur, Markus K. Oberthaler, B. Rienaecker, A. Hinterberger, L. Smestad, A. Fontana, M. Doser, Sebastian Gerber, V. N. Matveev, F. Guatieri, A. Rotondi, Doser, M., Aghion, S., Amsler, C., Bonomi, G., Brusa, R.S., Caccia, M., Caravita, R., Castelli, F., Cerchiari, G., Comparat, D., Consolati, G., Demetrio, A., Di Noto, L., Evans, C., Fanì, M., Ferragut, R., Fesel, J., Fontana, A., Gerber, S., Giammarchi, M., Gligorova, A., Guatieri, F., Haider, S., Hinterberger, A., Holmestad, H., Kellerbauer, A., Khalidova, O., Krasnický, D., Lagomarsino, V., Lansonneur, P., Lebrun, P., Malbrunot, C., Mariazzi, S., Marton, J., Matveev, V., Mazzotta, Z., Müller, S.R., Nebbia, G., Nedelec, P., Oberthaler, M., Pacifico, N., Pagano, D., Penasa, L., Petracek, V., Prelz, F., Prevedelli, M., Rienaecker, B., Robert, J., Røhne, O.M., Rotondi, A., Sandaker, H., Santoro, R., Smestad, L., Sorrentino, F., Testera, G., Tietje, I.C., Widmann, E., Yzombard, P., Zimmer, C., Zmeskal, J., Zurlo, N., Laboratoire Aimé Cotton (LAC), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: General Physics and Astronomy, Antiproton, magnetic field, Positronium, 01 natural sciences, 010305 fluids & plasmas, antihydrogen: formation, antimatter, Physics::Atomic Physics, Physics, antihydrogen, antiprotons, positrons, positronium, Large Hadron Collider, atom, General Engineering, Articles, antihydrogen, antiprotons, positronium, positrons, charge exchange, pulsed, anti-p, Antimatter, force: gravitation, gravitation: acceleration, Rydberg formula, symbols, Physics::General Physics, CERN Lab, General Mathematics, interferometer, Positron, antihydrogen: beam, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear physics, symbols.namesake, 0103 physical sciences, Physics::Atomic and Molecular Clusters, positronium: excited state, 010306 general physics, Antihydrogen, detector: position sensitive, gravitation: interaction, antihydrogen: production, ground state: hyperfine structure, Antiproton Decelerator, Automatic Keywords, Beam (structure)
Abstract: The efficient production of cold antihydrogen atoms in particle traps at CERN’s Antiproton Decelerator has opened up the possibility of performing direct measurements of the Earth’s gravitational acceleration on purely antimatter bodies. The goal of the AEgIS collaboration is to measure the value of g for antimatter using a pulsed source of cold antihydrogen and a Moiré deflectometer/Talbot–Lau interferometer. The same antihydrogen beam is also very well suited to measuring precisely the ground-state hyperfine splitting of the anti-atom. The antihydrogen formation mechanism chosen by AEgIS is resonant charge exchange between cold antiprotons and Rydberg positronium. A series of technical developments regarding positrons and positronium (Ps formation in a dedicated room-temperature target, spectroscopy of the n =1–3 and n =3–15 transitions in Ps, Ps formation in a target at 10 K inside the 1 T magnetic field of the experiment) as well as antiprotons (high-efficiency trapping of , radial compression to sub-millimetre radii of mixed plasmas in 1 T field, high-efficiency transfer of to the antihydrogen production trap using an in-flight launch and recapture procedure) were successfully implemented. Two further critical steps that are germane mainly to charge exchange formation of antihydrogen—cooling of antiprotons and formation of a beam of antihydrogen—are being addressed in parallel. The coming of ELENA will allow, in the very near future, the number of trappable antiprotons to be increased by more than a factor of 50. For the antihydrogen production scheme chosen by AEgIS, this will be reflected in a corresponding increase of produced antihydrogen atoms, leading to a significant reduction of measurement times and providing a path towards high-precision measurements. This article is part of the Theo Murphy meeting issue ‘Antiproton physics in the ELENA era’.
Published: 2018
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22. Compression of a mixed antiproton and electron non-neutral plasma to high densities

Author: E. Widmann, Rafael Ferragut, Marco Giammarchi, M. Doser, A. Gligorova, J. Marton, S. Haider, Z. Mazzotta, P. Lansonneur, A. Hinterberger, Nicola Pacifico, Giovanni Consolati, Ole Røhne, A. Fontana, Markus K. Oberthaler, B. Rienaecker, O. Khalidova, P. Lebrun, L. Smestad, J. Fesel, V. Petracek, R. S. Brusa, D. Krasnický, P. Nedelec, J. Robert, Ruggero Caravita, Heidi Sandaker, Johann Zmeskal, H. Holmestad, D. Pagano, V. Lagomarsino, Claude Amsler, C. Malbrunot, S.R. Müller, N. Zurlo, Lea Di Noto, P. Yzombard, S. Aghion, C. Zimmer, Romualdo Santoro, S. Mariazzi, G. Testera, M. Fanì, Fabrizio Castelli, Marco Prevedelli, M. Antonello, G. Nebbia, Daniel Comparat, I. C. Tietje, F. Sorrentino, F. Prelz, Luca Penasa, A. Kellerbauer, Sebastian Gerber, V. N. Matveev, F. Guatieri, Giovanni Cerchiari, A. Rotondi, A. Demetrio, C. Evans, G. Bonomi, Massimo Caccia, Laboratoire Aimé Cotton (LAC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Aghion, Stefano, Amsler, Claude, Bonomi, Germano, Brusa, Roberto S., Caccia, Massimo, Caravita, Ruggero, Castelli, Fabrizio, Cerchiari, Giovanni, Comparat, Daniel, Consolati, Giovanni, Demetrio, Andrea, Di Noto, Lea, Doser, Michael, Evans, Craig, Fanì, Mattia, Ferragut, Rafael, Fesel, Julian, Fontana, Andrea, Gerber, Sebastian, Giammarchi, Marco, Gligorova, Angela, Guatieri, Francesco, Haider, Stefan, Hinterberger, Alexander, Holmestad, Helga, Kellerbauer, Alban, Khalidova, Olga, Krasnický, Daniel, Lagomarsino, Vittorio, Lansonneur, Pierre, Lebrun, Patrice, Malbrunot, Chloé, Mariazzi, Sebastiano, Marton, Johann, Matveev, Victor, Mazzotta, Zeudi, Müller, Simon R., Nebbia, Giancarlo, Nedelec, Patrick, Oberthaler, Marku, Pacifico, Nicola, Pagano, Davide, Penasa, Luca, Petracek, Vojtech, Prelz, Francesco, Prevedelli, Marco, Rienaecker, Benjamin, Robert, Jacque, Røhne, Ole M., Rotondi, Alberto, Sandaker, Heidi, Santoro, Romualdo, Smestad, Lillian, Sorrentino, Fiodor, Testera, Gemma, Tietje, Ingmari C., Widmann, Eberhard, Yzombard, Pauline, Zimmer, Christian, Zmeskal, Johann, Zurlo, Nicola, Antonello, Massimiliano, École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Electron density, Antiparticle, experimental methods, CERN Lab, Penning trap, Context (language use), Electron, gravity, antimatter, trapped particles, 01 natural sciences, electron: density, 010305 fluids & plasmas, antiproton trapping, Penning–Malmberg trap, Nuclear physics, anti-p: density, density: spatial distribution, Physics in General, Atomic and Molecular Physics, 0103 physical sciences, Physics::Atomic Physics, 010306 general physics, Antihydrogen, Nuclear Experiment, Physics, Plasma Physics, antihydrogen: production, electron: cloud, imaging, Plasma, electron: plasma, Atomic and Molecular Physics, and Optics, anti-p: plasma, [PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph], Antiproton, efficiency, Antimatter, Physics::Accelerator Physics, High Energy Physics::Experiment, and Optics
Abstract: Abstract We describe a multi-step “rotating wall” compression of a mixed cold antiproton–electron non-neutral plasma in a 4.46 T Penning–Malmberg trap developed in the context of the AEḡIS experiment at CERN. Such traps are routinely used for the preparation of cold antiprotons suitable for antihydrogen production. A tenfold antiproton radius compression has been achieved, with a minimum antiproton radius of only 0.17 mm. We describe the experimental conditions necessary to perform such a compression: minimizing the tails of the electron density distribution is paramount to ensure that the antiproton density distribution follows that of the electrons. Such electron density tails are remnants of rotating wall compression and in many cases can remain unnoticed. We observe that the compression dynamics for a pure electron plasma behaves the same way as that of a mixed antiproton and electron plasma. Thanks to this optimized compression method and the high single shot antiproton catching efficiency, we observe for the first time cold and dense non-neutral antiproton plasmas with particle densities n ≥ 1013 m−3, which pave the way for an efficient pulsed antihydrogen production in AEḡIS. Graphical abstract
Published: 2018

23. AEgIS ¯ latest results

Author: B. Rienaecker, P. Nedelec, G. Nebbia, J. Robert, A. Hinterberger, M. Caccia, L. Smestad, V. Petráček, Fabrizio Castelli, Daniel Comparat, Chloé Malbrunot, Michael Doser, Sebastiano Mariazzi, S. Haider, Alberto Rotondi, N. Pacifico, Claude Amsler, M. Oberthaler, L. Di Noto, Luca Penasa, Stefano Aghion, R. S. Brusa, G. Testera, Angela Gligorova, P. Lebrun, Z. Mazzotta, Eberhard Widmann, F. Prelz, M. C. Simon, D. Krasnický, V. Lagomarsino, Felice Sorrentino, A. Demetrio, G. Angela, H. Holmestad, Ruggero Caravita, Alban Kellerbauer, P. Yzombard, Johann Zmeskal, C. Evans, Giovanni Consolati, Germano Bonomi, Sebastian Gerber, Giovanni Cerchiari, R. Santoro, V. A. Matveev, F. Guatieri, M. Fanì, Rafael Ferragut, P. Lansonneur, Heidi Sandaker, Andrea Fontana, O.M. Rhne., Marco Giammarchi, S.R. Müller, Davide Pagano, C. Zimmer, M. Sacerdoti, Marco Prevedelli, I. C. Tietje, Nicola Zurlo, and J. Fesel
Subjects: Physics, Large Hadron Collider, 010308 nuclear & particles physics, General relativity, QC1-999, 01 natural sciences, 7. Clean energy, Positronium, Antiproton Decelerator, Nuclear physics, Interferometry, Antiproton, Antimatter, 0103 physical sciences, 010306 general physics, Beam (structure)
Abstract: The validity of the Weak Equivalence Principle (WEP) as predicted by General Relativity has been tested up to astounding precision using ordinary matter. The lack hitherto of a stable source of a probe being at the same time electrically neutral, cold and stable enough to be measured has prevented highaccuracy testing of the WEP on anti-matter. The AEg̅IS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) experiment located at CERN's AD (Antiproton Decelerator) facility aims at producing such a probe in the form of a pulsed beam of cold anti-hydrogen, and at measuring by means of a moiré deflectometer the gravitational force that Earth's mass exerts on it. Low temperature and abundance of the H̅ are paramount to attain a high precision measurement. A technique employing a charge-exchange reaction between antiprotons coming from the AD and excited positronium atoms is being developed at AEg̅IS and will be presented hereafter, alongside an overview of the experimental apparatus and the current status of the experiment
Published: 2018

24. A moiré deflectometer for antimatter

Author: Markus K. Oberthaler, M. Kimura, S. Di Domizio, Marco Giammarchi, N. Pacifico, Marco Prevedelli, P. Nedelec, C. Pistillo, F. Prelz, Ruggero Caravita, Alban Kellerbauer, P. Genova, O. Ahlén, G. Nebbia, L. Cabaret, Viktor Matveev, Simone Cialdi, F. Moia, Paola Scampoli, James William Storey, M. A. Subieta Vasquez, E. Jordan, P. Bräunig, Carlo Canali, Daniel Comparat, G. Testera, T. Huse, Thomas Kaltenbacher, A. S. Belov, Sebastiano Mariazzi, R. S. Brusa, Claude Amsler, R. Vaccarone, Vojtech Petracek, Akitaka Ariga, S. N. Gninenko, Sebastian Lehner, Giovanni Cerchiari, Fabrizio Castelli, A. Knecht, C. Malbrunot, Angela Gligorova, Sandra Zavatarelli, Michael Doser, Antonio Ereditato, Giovanni Consolati, Germano Bonomi, M. Spacek, Johann Zmeskal, Adriano Fontana, D. Krasnický, Karl Berggren, Stefano Aghion, H. Derking, C. Regenfus, J. Bremer, Alexey Dudarev, Ole Røhne, A. Magnani, Tomoko Ariga, Jiro Kawada, L. Di Noto, Rafael Ferragut, S. Haider, Eberhard Widmann, V. Lagomarsino, Alberto Rotondi, L. V. Jørgensen, Heidi Sandaker, C. Riccardi, Laboratoire Aimé Cotton (LAC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), AEGIS, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), S., Aghion, O., Ahl?n, C., Amsler, A., Ariga, T., Ariga, A. S., Belov, K., Berggren, G., Bonomi, P., Br?unig, J., Bremer, R. S., Brusa, L., Cabaret, C., Canali, R., Caravita, F., Castelli, G., Cerchiari, S., Cialdi, D., Comparat, G., Consolati, H., Derking, S., Di Domizio, L., Di Noto, M., Doser, A., Dudarev, A., Ereditato, R., Ferragut, A., Fontana, P., Genova, M., Giammarchi, A., Gligorova, S. N., Gninenko, S., Haider, T., Huse, E., Jordan, L. V., J?rgensen, T., Kaltenbacher, J., Kawada, A., Kellerbauer, M., Kimura, A., Knecht, D., Krasnick?, V., Lagomarsino, S., Lehner, A., Magnani, C., Malbrunot, S., Mariazzi, V. A., Matveev, F., Moia, G., Nebbia, P., N?d?lec, M. K., Oberthaler, N., Pacifico, V., Petr??ek, C., Pistillo, F., Prelz, M., Prevedelli, C., Regenfu, C., Riccardi, O., R?hne, A., Rotondi, H., Sandaker, Scampoli, Paola, J., Storey, M. A., Subieta Vasquez, M., ?pa?ek, G., Testera, R., Vaccarone, E., Widmann, S., Zavatarelli, J., Zmeskal, S. Aghion, O. Ahlén, C. Amsler, A. Ariga, T. Ariga, A. S. Belov, K. Berggren, G. Bonomi, P. Bräunig, J. Bremer, R. S. Brusa, L. Cabaret, C. Canali, R. Caravita, F. Castelli, G. Cerchiari, S. Cialdi, D. Comparat, G. Consolati, H. Derking, S. Di Domizio, L. Di Noto, M. Doser, A. Dudarev, A. Ereditato, R. Ferragut, A. Fontana, P. Genova, M. Giammarchi, A. Gligorova, S. N. Gninenko, S. Haider, T. Huse, E. Jordan, L. V. Jørgensen, T. Kaltenbacher, J. Kawada, A. Kellerbauer, M. Kimura, A. Knecht, D. Krasnický, V. Lagomarsino, S. Lehner, A. Magnani, C. Malbrunot, S. Mariazzi, V. A. Matveev, F. Moia, G. Nebbia, P. Nédélec, M. K. Oberthaler, N. Pacifico, V. Petràček, C. Pistillo, F. Prelz, M. Prevedelli, C. Regenfu, C. Riccardi, O. Røhne, A. Rotondi, H. Sandaker, P. Scampoli, J. Storey, M.A. Subieta Vasquez, M. Špaček, G. Testera, R. Vaccarone, E. Widmann, S. Zavatarelli, and J. Zmeskal
Subjects: Physics::General Physics, 530 Physics, General Physics and Astronomy, Context (language use), Gravitational acceleration, 01 natural sciences, 7. Clean energy, Article, General Biochemistry, Genetics and Molecular Biology, Nuclear physics, Acceleration, 0103 physical sciences, antimatter, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Equivalence principle, 010306 general physics, Antihydrogen, Physics, Multidisciplinary, 010308 nuclear & particles physics, Matematikk og naturvitenskap: 400::Fysikk: 430::Kjerne- og elementærpartikkelfysikk: 431 [VDP], General Chemistry, Computational physics, Mathematics and natural scienses: 400::Physics: 430::Nuclear and elementary particle physics: 431 [VDP], Deflection (physics), gravitation, Antiproton, Antimatter, PARTICLE PHYSICS, Particle Physics - Experiment
Abstract: The precise measurement of forces is one way to obtain deep insight into the fundamental interactions present in nature. In the context of neutral antimatter, the gravitational interaction is of high interest, potentially revealing new forces that violate the weak equivalence principle. Here we report on a successful extension of a tool from atom optics—the moiré deflectometer—for a measurement of the acceleration of slow antiprotons. The setup consists of two identical transmission gratings and a spatially resolving emulsion detector for antiproton annihilations. Absolute referencing of the observed antimatter pattern with a photon pattern experiencing no deflection allows the direct inference of forces present. The concept is also straightforwardly applicable to antihydrogen measurements as pursued by the AEgIS collaboration. The combination of these very different techniques from high energy and atomic physics opens a very promising route to the direct detection of the gravitational acceleration of neutral antimatter., Measuring forces on antimatter is vital to testing our understanding of fundamental physics. Towards this aim, Aghion et al. present a method to measure the deflection of antiprotons based on an atom optical tool, the moiré deflectometer, which could be extended to future antihydrogen gravity measurements.
Published: 2014

25. Towards the first measurement of matter-antimatter gravitational interaction

Author: Giovanni Consolati, Heidi Sandaker, A. Kellerbauer, D. Krasnický, S. Haider, L. Di Noto, Z. Mazzotta, P. Lebrun, Giovanni Cerchiari, Daniel Comparat, Markus K. Oberthaler, Massimo Caccia, P. Nedelec, E. Widmann, Rafael Ferragut, G. Testera, G. Bonomi, B. Rienaecker, A. Fontana, C. Malbrunot, L. Ravelli, I. C. Tietje, V. Lagomarsino, Fabrizio Castelli, C. Zimmer, G. Nebbia, F. Sorrentino, Sebastian Gerber, S.R. Müller, O. Khalidova, Luca Penasa, Ruggero Caravita, V. N. Matveev, M. Doser, S. Aghion, Marco Prevedelli, F. Guatieri, R. S. Brusa, Claude Amsler, Marco Giammarchi, A. Hinterberger, Romualdo Santoro, S. Mariazzi, A. Demetrio, C. Evans, J. Fesel, P. Lansonneur, F. Prelz, M. Fanì, L. Smestad, J. Robert, A. Rotondi, A. Gligorova, H. Holmestad, N. Zurlo, P. Yzombard, Nicola Pacifico, J. Marton, Ole Røhne, V. Petracek, Johann Zmeskal, D. Pagano, Laboratoire Aimé Cotton (LAC), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Physics::General Physics, experimental methods, geometry, CERN Lab, electric field: gradient, QC1-999, deflection, 02 engineering and technology, Gravitational acceleration, 7. Clean energy, 01 natural sciences, antihydrogen: acceleration, Nuclear physics, Gravitation, Physics and Astronomy (all), Gravitational field, 0103 physical sciences, Physics::Atomic and Molecular Clusters, antimatter, Physics::Atomic Physics, Equivalence principle, positronium: excited state, 010306 general physics, Antihydrogen, Physics, General Relativity and Cosmology, detector: position sensitive, atom, gravitation: interaction, 021001 nanoscience & nanotechnology, charge exchange, anti-p, experimental equipment, Deflection (physics), equivalence principle, Antiproton, Antimatter, gravitation: acceleration, [PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc], 0210 nano-technology, experimental results
Abstract: International audience; The AEgIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) is a CERN based experiment with the central aim to measure directly the gravitational acceleration of antihydrogen. Antihydrogen atoms will be produced via charge exchange reactions which will consist of Rydberg-excited positronium atoms sent to cooled antiprotons within an electromagnetic trap. The resulting Rydberg antihydrogen atoms will then be horizontally accelerated by an electric field gradient (Stark effect), they will then pass through a moiré deflectometer. The vertical deflection caused by the Earth's gravitational field will test for the first time the Weak Equivalence Principle for antimatter. Detection will be undertaken via a position sensitive detector. Around $10^3$ antihydrogen atoms are needed for the gravitational measurement to be completed. The present status, current achievements and results will be presented, with special attention toward the laser excitation of positronium (Ps) to the $n=3$ state and the production of Ps atoms in the transmission geometry.
Published: 2017

26. The AEgIS experiment at CERN: Measuring antihydrogen free-fall in earth's gravitational field to test WEP with antimatter

Author: Daniel Comparat, P. Lebrun, Heidi Sandaker, L. Ravelli, Davide Pagano, Alberto Rotondi, G. Testera, S. Haider, Tomoko Ariga, Antonio Ereditato, F. Prelz, Rafael Ferragut, Fabrizio Castelli, Michael Doser, Sebastian Gerber, Paola Scampoli, F. Guatieri, Claude Amsler, H. Holmestad, P. Lansonneur, Felice Sorrentino, Giovanni Consolati, Germano Bonomi, M. Oberthaler, M. Sacerdoti, Angela Gligorova, Marco Prevedelli, P. Yzombard, I. C. Tietje, Nicola Zurlo, L. Cabaret, Patrick Nedelec, Johann Zmeskal, T. Huse, G. Nebbia, Adriano Fontana, Sebastiano Mariazzi, B. Rienaecker, N. Pacifico, Luca Penasa, Roberto S. Brusa, S. Vamosi, V. Petracek, C. Pistillo, Ruggero Caravita, Marco Giammarchi, Z. Mazzotta, Alban Kellerbauer, V. A. Matveev, Eberhard Widmann, V. Lagomarsino, L. Di Noto, Massimo Caccia, I. M. Strojek, Ole Røhne, Giovanni Cerchiari, P. Bräunig, D. Krasnický, A. Demetrio, C. Evans, J. Fesel, Chloé Malbrunot, L. Smestad, Romualdo Santoro, Brusa, R. S, Amsler, C, Ariga, T, Bonomi, G, Bräunig, P, Cabaret, L, Caccia, M, Caravita, R, Castelli, F, Cerchiari, G, Comparat, D, Consolati, G, Demetrio, A., Di Noto, L, Doser, M, Ereditato, A, Evans, C, Ferragut, R, Fesel, J, Fontana, A, Gerber, S, Giammarchi, M, Gligorova, A, Guatieri, F, Haider, S, Holmestad, H, Huse, T, Kellerbauer, A, Krasnický, D, Lagomarsino, V, Lansonneur, P, Lebrun, P, Malbrunot, C, Mariazzi, S, Matveev, V, Mazzotta, Z, Nebbia, G, Nedelec, P, Oberthaler, M, Pacifico, N, Pagano, D, Penasa, L, Petracek, V, Pistillo, C, Prelz, F, Prevedelli, M, Ravelli, L, Rienaecker, B, Røhne, O. M, Rotondi, A, Sacerdoti, M, Sandaker, H, Santoro, R, Scampoli, Paola, Smestad, L, Sorrentino, F, Strojek, I. M, Testera, G, Tietje, I. C, Vamosi, S, Widmann, E, Yzombard, P, Zmeskal, J, Zurlo, N., Brusa, R S, Røhne, O M, Scampoli, P, Strojek, I M, Tietje, I C, Zurlo, N, Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Aimé Cotton (LAC), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan)
Subjects: History, Physics::General Physics, CERN Lab, 530 Physics, deflection, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], antihydrogen: beam, 7. Clean energy, 01 natural sciences, Education, Nuclear physics, Physics and Astronomy (all), Gravitational field, positron: capture, anti-p: capture, 0103 physical sciences, excited state, antimatter, Physics::Atomic Physics, Equivalence principle, 010306 general physics, Antihydrogen, Physics, Large Hadron Collider, 010308 nuclear & particles physics, charge exchange, Computer Science Applications, Antiproton Decelerator, Deflection (physics), equivalence principle, Antiproton, gravitation, Antimatter, Physics::Accelerator Physics, High Energy Physics::Experiment, gravity, antihydrogen
Abstract: International audience; The AEgIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) experiment is designed with the objective to test the weak equivalence principle with antimatter by studying the free fall of antihydrogen in the Earth’s gravitational field. A pulsed cold beam of antihydrogen will be produced by charge exchange between cold Ps excited in Rydberg state and cold antiprotons. Finally the free fall will be measured by a classical moiré deflectometer. The apparatus being assembled at the Antiproton Decelerator at CERN will be described, then the advancements of the experiment will be reported: positrons and antiprotons trapping measurements, Ps two-step excitation and a test-measurement of antiprotons deflection with a small scale moiré deflectometer.
Published: 2017

27. Characterization of a transmission positron/positronium converter for antihydrogen production

Author: Victor Matveev, Paola Scampoli, Tomoko Ariga, Ulrik I. Uggerhøj, S. Haider, Claude Amsler, S.R. Müller, G. Nebbia, J. Fesel, Ole Røhne, B. Rienäcker, Roberto S. Brusa, Z. Mazzotta, G. Testera, Eberhard Widmann, Rafael Ferragut, V. Petracek, Giovanni Cerchiari, Felice Sorrentino, Romualdo Santoro, V. Lagomarsino, Alban Kellerbauer, L. Resch, S.L. Andersen, N. Pacifico, Luca Penasa, F. Lyckegaard, F. Prelz, Fabrizio Castelli, Stefano Aghion, J. Robert, D. Krasnický, A. Demetrio, Sebastiano Mariazzi, C. Evans, L. Ravelli, L. Di Noto, Michael Doser, Ruggero Caravita, Davide Pagano, P. Lebrun, C. Zimmer, Giovanni Consolati, Jacques Chevallier, Germano Bonomi, P. Lansonneur, Massimo Caccia, Sebastian Gerber, Marco Giammarchi, Daniel Comparat, Heidi Sandaker, Antonio Ereditato, M. Sacerdoti, M. C. Simon, F. Guatieri, Nicola Zurlo, Marco Prevedelli, H. Holmestad, L. Povolo, Chloé Malbrunot, I. C. Tietje, Adriano Fontana, Alberto Rotondi, A. Hinterberger, L. Smestad, Patrick Nedelec, Johann Zmeskal, M. Oberthaler, Angela Gligorova, P. Yzombard, Université Paris-Sud - Paris 11 (UP11), Laboratoire Aimé Cotton (LAC), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Aghion, S., Amsler, C., Ariga, T., Bonomi, G., Brusa, R.S., Caccia, M., Caravita, R., Castelli, F., Cerchiari, G., Comparat, D., Consolati, G., Demetrio, A., Di Noto, L., Doser, M., Ereditato, A., Evans, C., Ferragut, R., Fesel, J., Fontana, A., Gerber, S., Giammarchi, M., Gligorova, A., Guatieri, F., Haider, S., Hinterberger, A., Holmestad, H., Kellerbauer, A., Krasnický, D., Lagomarsino, V., Lansonneur, P., Lebrun, P., Malbrunot, C., Mariazzi, S., Matveev, V., Mazzotta, Z., Müller, S.R., Nebbia, G., Nedelec, P., Oberthaler, M., Pacifico, N., Pagano, D., Penasa, L., Petracek, V., Povolo, L., Prelz, F., Prevedelli, M., Ravelli, L., Resch, L., Rienäcker, B., Robert, J., Røhne, O.M., Rotondi, A., Sacerdoti, M., Sandaker, H., Santoro, R., Scampoli, P., Simon, M., Smestad, L., Sorrentino, F., Testera, G., Tietje, I.C., Widmann, E., Yzombard, P., Zimmer, C., Zmeskal, J., Zurlo, N., Andersen, S.L., Chevallier, J., Uggerhøj, U.I., Lyckegaard, F., Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Brusa, R. S., Müller, S. R., Røhne, O. M., Scampoli, Paola, Tietje, I. C., Andersen, S. L., and Uggerhøj, U. I.
Subjects: Photomultiplier, COLLISIONS, Positronium, Transmission, Antihydrogen, Nuclear and High Energy Physics, GRAPHITE, Astrophysics::High Energy Astrophysical Phenomena, BEAM, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Kinetic energy, Positronium, 01 natural sciences, Secondary electrons, 010305 fluids & plasmas, SECONDARY-ELECTRON EMISSION, Positron, POSITRON-ANNIHILATION, THIN-FILMS, 0103 physical sciences, Transmission, Antihydrogen, mesa-structured silica, 010306 general physics, COLD, Instrumentation, Physics, PLASMA, Scattering, SURFACES, positronium, mesa-structured silica, TRANSPORT, Time of flight, Physics::Accelerator Physics, Atomic physics
Abstract: In this work a characterization study of forward emission from a thin, meso-structured silica Received 17 March 2017 positron/positronium (Ps) converter following implantation of positrons in light of possible antihydrogen production is presented. The target consisted of a similar to 1 mu m thick ultraporous silica film e-gun evaporated onto a 20 nm carbon foil. The Ps formation and emission was studied via Single Shot Positron Annihilation Lifetime Spectroscopy measurements after implantation of pulses with 3 4.10(7) positrons and 10 ns temporal width. The forward emission of implanted positrons and secondary electrons was investigated with a micro-channel plate phosphor screen assembly, connected either to a CCD camera for imaging of the impinging particles, or to a fast photomultiplier tube to extract information about their time of flight. The maximum Ps formation fraction was estimated to be similar to 10%. At least 10% of the positrons implanted with an energy of 3.3 keV are forward-emitted with a scattering angle smaller than 50 and maximum kinetic energy of 1.2 keV. At least 0.1-0.2 secondary electrons per implanted positron were also found to be forward-emitted with a kinetic energy of a few eV. The possible application of this kind of positron/positronium converter for antihydrogen production is discussed. (C) 2017 Elsevier B.V. All rights reserved.
Published: 2017

28. Advances in PS manipulations and laser studies in the AEgIS experiment

Author: S. Haider, Johann Marton, Ruggero Caravita, Davide Pagano, S. Müller, J. Robert, G. Nebbia, Nicola Pacifico, Markus K. Oberthaler, J. Fesel, Rafael Ferragut, D. Krasnický, R. S. Brusa, L. Ravelli, Massimo Caccia, Giovanni Consolati, A. Demetrio, C. Zimmer, Patrick Nedelec, Johann Zmeskal, C. Evans, Sebastiano Mariazzi, Felice Sorrentino, B. Rienäcker, V. Petráček, F. Prelz, Marco Giammarchi, L. Di Noto, Giovanni Cerchiari, Heidi Sandaker, E. Widmann, Stefano Aghion, Andrea Fontana, Sebastian Gerber, V. Lagomarsino, A. Hinterberger, V. Matveev, Chloé Malbrunot, Angela Gligorova, Ole Røhne, F. Guatieri, O. Khalidova, Daniel Comparat, P. Lansonneur, Marco Prevedelli, I. C. Tietje, Alberto Rotondi, G. Testera, Lillian Smestad, Luca Penasa, Fabrizio Castelli, Michael Doser, Ph. Lebrun, H. Holmestad, P. Yzombard, Z. Mazzotta, Alban Kellerbauer, Germano Bonomi, Nicola Zurlo, Claude Amsler, Romualdo Santoro, Laboratoire Aimé Cotton (LAC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Caravita, R., Aghion, S., Amsler, C., Bonomi, G., Brusa, R. S., Caccia, M., Castelli, F., Cerchiari, G., Comparat, D., Consolati, G., Demetrio, A., Di Noto, L., Doser, M., Evans, C., Ferragut, R., Fesel, J., Fontana, A., Gerber, S., Giammarchi, M., Gligorova, A., Guatieri, F., Haider, S., Hinterberger, A., Holmestad, H., Kellerbauer, A., Khalidova, O., Krasnickã½, D., Lagomarsino, V., Lansonneur, P., Lebrun, P., Malbrunot, C., Mariazzi, S., Marton, J., Matveev, V., Mazzottae, Z., Mã¼ller, S. R., Nebbia, G., Nedelec, P., Oberthaler, M., Pacifico, N., Pagano, D., Penasa, L., Petracek, V., Prelz, F., Prevedelli, Marco, Ravelli, L., Rienã¤cker, B., Robert, J., Rã¸hne, O. M., Rotondi, A., Sandaker, H., Santoro, R., Smestad, L., Sorrentino, F., Testera, G., Tietje, I., Widmann, E., Yzombard, P., Zimmer, C., Zmeskal, J., and Zurlo, N.
Subjects: Physics, Antimatter, 010308 nuclear & particles physics, Physics and Astronomy, Positronium formation, 020209 energy, General Physics and Astronomy, Nanotechnology, 02 engineering and technology, Laser, 01 natural sciences, law.invention, Physics and Astronomy (all), Antimatter, Gravity, law, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Physics::Atomic Physics, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Detectors and Experimental Techniques
Abstract: International audience; Positronium (Ps), the unstable bound state of electron and positron, is a valuable system for neutral antimatter spectroscopic studies and for antihydrogen production. Forming a pulsed beam cold antihydrogen using charge-exchange with the Rydberg Ps is the goal of the AEgIS Collaboration, which aims to measure gravity on neutral antimatter. Recent results achieved in producing, manipulating and studying Ps are summarized. Ps has been first produced with mesoporous silica targets in a reflection geometry. Spectroscopy of Ps n = 3 state has been conducted, yielding as a byproduct an independent estimate of the produced Ps temperature. Efficient laser excitation to the Rydberg levels was then achieved, validating the proof-of-concept of AEgIS. Subsequently, production of Ps from a new class of transmission targets was also achieved, opening the possibility for future experiments.
Published: 2017

29. Positronium for Antihydrogen Production in the AEGIS Experiment

Author: Heidi Sandaker, G. Nebbia, Eberhard Widmann, V. Lagomarsino, Sebastian Gerber, Z. Mazzotta, S.R. Müller, Markus K. Oberthaler, Romualdo Santoro, M. Fanì, F. Guatieri, B. Rienaecker, Alban Kellerbauer, P. Yzombard, Alberto Rotondi, Sebastiano Mariazzi, L. Di Noto, A. Hinterberger, Ole Røhne, A. Demetrio, Claude Amsler, Daniel Comparat, Giovanni Consolati, C. Evans, L. Smestad, Germano Bonomi, Massimo Caccia, Johann Marton, Nicola Zurlo, Rafael Ferragut, Andrea Fontana, V. Petráček, Nicola Pacifico, C. Malbrunot, Ruggero Caravita, O. Khalidova, D. Krasnicky, Felice Sorrentino, V. A. Matveev, Marco Giammarchi, P. Lansonneur, F. Prelz, Stefano Aghion, R. S. Brusa, J. Fesel, Patrick Nedelec, Johann Zmeskal, Giovanni Cerchiari, Luca Penasa, Marco Prevedelli, H. Holmestad, I. C. Tietje, S. Haider, G. Testera, Fabrizio Castelli, Michael Doser, Angela Gligorova, P. Lebrun, J. Robert, L. Ravelli, Davide Pagano, C. Zimmer, Laboratoire Aimé Cotton (LAC), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Consolati, G., Aghion, S., Amsler, C., Bonomi, G., Brusa, R. S., Caccia, M., Caravita, R., Castelli, F., Cerchiari, G., Comparat, D., Demetrio, A., Di Noto, L., Doser, M., Evans, C., Fanì, M., Ferragut, R., Fesel, J., Fontana, A., Gerber, S., Giammarchi, M., Gligorova, A., Guatieri, F., Haider, S., Hinterberger, A., Holmestad, H., Kellerbauer, A., Khalidova, O., Krasnicky, D., Lagomarsino, V., Lansonneur, P., Lebrun, P., Malbrunot, C., Mariazzi, S., Marton, J., Matveev, V., Mazzotta, Z., Müller, S. R., Nebbia, G., Nedelec, P., Oberthaler, M., Pacifico, N., Pagano, D., Penasa, L., Petracek, V., Prelz, F., Prevedelli, M., Ravelli, L., Rienaecker, B., Robert, J., Røhne, O. M., Rotondi, A., Sandaker, H., Santoro, R., Smestad, L., Sorrentino, F., Testera, G., Tietje, I. C., Widmann, E., Yzombard, P., Zimmer, C., Zmeskal, J., and Zurlo, N.
Subjects: Physics::General Physics, experimental methods, CERN Lab, talk: Lublin 2017/08/28, General Physics and Astronomy, anti-p: acceleration, Gravitational acceleration, 7. Clean energy, 01 natural sciences, anti-p p: annihilation, Nuclear physics, symbols.namesake, Physics and Astronomy (all), 0103 physical sciences, antimatter, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Atomic Physics, positronium: excited state, anti-p: beam, 010306 general physics, Antihydrogen, Physics, 010308 nuclear & particles physics, antihydrogen: production, Antiproton Decelerator, positronium: target, Antiproton, Antimatter, Excited state, gravitation: acceleration, Rydberg formula, symbols, proposed experiment, Rydberg state, gravity, antimatter, Particle Physics - Experiment
Abstract: International audience; The primary goal of the Antihydrogen Experiment: Gravity, Interferometry, Spectroscopy (AEGIS) collaboration is to measure for the first time precisely the gravitational acceleration of antihydrogen, H¯ , a fundamental issue of contemporary physics, using a beam of antiatoms. Indeed, although indirect arguments have been raised against a different acceleration of antimatter with respect to matter, nevertheless some attempts to formulate quantum theories of gravity, or to unify gravity with the other forces, consider the possibility of a non-identical gravitational interaction between matter and antimatter. We plan to generate H¯ through a charge-exchange reaction between excited Ps and antiprotons coming from the Antiproton Decelerator facility at CERN. It offers the advantage to produce sufficiently cold antihydrogen to make feasible a measurement of gravitational acceleration with reasonable uncertainty (of the order of a few percent). Since the cross-section of the above reaction increases with n 4 , n being the principal quantum number of Ps, it is essential to generate Ps in a highly excited (Rydberg) state. This will occur by means of two laser excitations of Ps emitted from a nanoporous silica target: a first UV laser (at 205 nm) will bring Ps from the ground to the n = 3 state; a second laser pulse (tunable in the range 1650–1700 nm) will further excite Ps to the Rydberg state.
Published: 2017
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30. Measurement of antiproton annihilation on Cu, Ag and Au with emulsion films

Author: Ole Røhne, M. Sacerdoti, D. Krasnicky, Marco Prevedelli, Daniel Comparat, I. C. Tietje, Patrick Nedelec, A. Hinterberger, Akitaka Ariga, Johann Zmeskal, V. Lagomarsino, Rafael Ferragut, V. Matveev, Z. Mazzotta, C. Pistillo, Roberto S. Brusa, J. Fesel, P. Bräunig, S. Vamosi, Nicola Pacifico, Alban Kellerbauer, Ruggero Caravita, V. Petracek, L. Ravelli, G. Nebbia, L. Cabaret, Paola Scampoli, Davide Pagano, Giovanni Consolati, Germano Bonomi, T. Huse, F. Prelz, Heidi Sandaker, Massimo Caccia, B. Rienaecker, Claude Amsler, C. Zimmer, Sebastiano Mariazzi, E. Widmann, M. Oberthaler, Angela Gligorova, Michal Simon, Sebastian Gerber, Jiro Kawada, S. Müller, Alberto Rotondi, L. Di Noto, Adriano Fontana, Chloé Malbrunot, F. Guatieri, M. Vladymyrov, P. Yzombard, P. Lansonneur, Ph. Lebrun, H. Holmestad, S. Haider, Tomoko Ariga, Stefano Aghion, Antonio Ereditato, Marco Giammarchi, Lillian Smestad, Felice Sorrentino, G. Testera, Fabrizio Castelli, Michael Doser, Giovanni Cerchiari, M. Kimura, A. Demetrio, C. Evans, Nicola Zurlo, Luca Penasa, Romualdo Santoro, Aghion, S., Amsler, C., Ariga, A., Ariga, T., Bonomi, G., Bräunig, P., Brusa, R.S., Cabaret, L., Caccia, M., Caravita, R., Castelli, F., Cerchiari, G., Comparat, D., Consolati, G., Demetrio, A., Noto, L. Di, Doser, M., Ereditato, A., Evans, C., Ferragut, R., Fesel, J., Fontana, A., Gerber, S., Giammarchi, M., Gligorova, A., Guatieri, F., Haider, S., Hinterberger, A., Holmestad, H., Huse, T., Kawada, J., Kellerbauer, A., Kimura, M., Krasnický, D., Lagomarsino, V., Lansonneur, P., Lebrun, P., Malbrunot, C., Mariazzi, S., Matveev, V., Mazzotta, Z., Müller, S.R., Nebbia, G., Nedelec, P., Oberthaler, M., Pacifico, N., Pagano, D., Penasa, L., Petracek, V., Pistillo, C., Prelz, F., Prevedelli, M., Ravelli, L., Rienaecker, B., Røhne, O.M., Rotondi, A., Sacerdoti, M., Sandaker, H., Santoro, R., Scampoli, P., Simon, M., Smestad, L., Sorrentino, F., Testera, G., Tietje, I.C., Vamosi, S., Vladymyrov, M., Widmann, E., Yzombard, P., Zimmer, C., Zmeskal, J., Zurlo, N., Laboratoire Aimé Cotton (LAC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Brusa, R. S., Müller, S. R., Røhne, O. M., Scampoli, Paola, and Tietje, I. C.
Subjects: Particle physics, Physics - Instrumentation and Detectors, 530 Physics, Monte Carlo method, Detector modelling and simulations I (interaction of radiation with matter, FOS: Physical sciences, interaction of radiation with matter, interaction of photons with matter, interaction of hadrons with matter, Particle tracking detectors, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), emulsion detectors, 0103 physical sciences, antimatter, free fall, Detector modelling and simulations I (interaction of radiation with matter, interaction of photons with matter, interaction of hadrons with matter, etc), Particle tracking detectors (Solidstate detectors), Instrumentation, Mathematical Physics, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Detectors and Experimental Techniques, 010306 general physics, Nuclear Experiment, Particle tracking detectors (Solid- state detectors), physics.ins-det, detectors, antiproton annihilation, etc), antihydrogen, Physics, Large Hadron Collider, Annihilation, 010308 nuclear & particles physics, hep-ex, emulsion detectors, antiproton annihilation, antimatter, free fall, antimatter, antihydrogen, detectors, antiprotons, interaction of photons with matter, Instrumentation and Detectors (physics.ins-det), Hadronization, Antiproton Decelerator, interaction of hadrons with matter, Beamline, Antiproton, Particle, Physics::Accelerator Physics, High Energy Physics::Experiment, antiprotons, Particle Physics - Experiment
Abstract: The characteristics of low energy antiproton annihilations on nuclei (e.g. hadronization and product multiplicities) are not well known, and Monte Carlo simulation packages that use different models provide different descriptions of the annihilation events. In this study, we measured the particle multiplicities resulting from antiproton annihilations on nuclei. The results were compared with predictions obtained using different models in the simulation tools GEANT4 and FLUKA. For this study, we exposed thin targets (Cu, Ag and Au) to a very low energy antiproton beam from CERN's Antiproton Decelerator, exploiting the secondary beamline available in the AEgIS experimental zone. The antiproton annihilation products were detected using emulsion films developed at the Laboratory of High Energy Physics in Bern, where they were analysed at the automatic microscope facility. The fragment multiplicity measured in this study is in good agreement with results obtained with FLUKA simulations for both minimally and heavily ionizing particles. The characteristics of low energy antiproton annihilations on nuclei (e.g. hadronization and product multiplicities) are not well known, and Monte Carlo simulation packages that use different models provide different descriptions of the annihilation events. In this study, we measured the particle multiplicities resulting from antiproton annihilations on nuclei. The results were compared with predictions obtained using different models in the simulation tools GEANT4 and FLUKA. For this study, we exposed thin targets (Cu, Ag and Au) to a very low energy antiproton beam from CERN's Antiproton Decelerator, exploiting the secondary beamline available in the AEgIS experimental zone. The antiproton annihilation products were detected using emulsion films developed at the Laboratory of High Energy Physics in Bern, where they were analysed at the automatic microscope facility. The fragment multiplicity measured in this study is in good agreement with results obtained with FLUKA simulations for both minimally and heavily ionizing particles.
Published: 2017

31. The DAQ system for the AEḡIS experiment

Author: Patrick Nedelec, Z. Mazzotta, Tomoko Ariga, F. Sorrentino, Paola Scampoli, Johann Zmeskal, Alban Kellerbauer, Claude Amsler, P. Lansonneur, Antonio Ereditato, J. Robert, G. Nebbia, F. Prelz, Giovanni Consolati, Andrea Fontana, Germano Bonomi, B. Rienaecker, Heidi Sandaker, Chloé Malbrunot, Fabrizio Castelli, N. Pacifico, P. Lebrun, Michael Doser, Luca Penasa, M. Sacerdoti, Daniel Comparat, M. C. Simon, Marco Prevedelli, Sebastiano Mariazzi, I. C. Tietje, H. Holmestad, L. Ravelli, L. Di Noto, D. Krasnický, A. Demetrio, Stefano Aghion, Marco Giammarchi, C. Evans, Sebastian Gerber, Davide Pagano, Alberto Rotondi, M. Oberthaler, G. Testera, Angela Gligorova, Giovanni Cerchiari, C. Zimmer, Eberhard Widmann, F. Guatieri, A. Hinterberger, V. Lagomarsino, P. Yzombard, Rafael Ferragut, S. Haider, Ruggero Caravita, Ole Røhne, L. Smestad, R. S. Brusa, Massimo Caccia, V. Petráček, S.R. Müller, Romualdo Santoro, J. Fesel, Viktor Matveev, Nicola Zurlo, Prelz, F, Aghion, S, Amsler, C, Ariga, T, Bonomi, G, Brusa, R. S, Caccia, M, Caravita, R, Castelli, F, Cerchiari, G, Comparat, D, Consolati, G, Demetrio, A, Di Noto, L, Doser, M, Ereditato, A, Evans, C, Ferragut, R, Fesel, J, Fontana, A, Gerber, S, Giammarchi, M, Gligorova, A, Guatieri, F, Haider, S, Hinterberger, A, Holmestad, H, Kellerbauer, A, Krasnický, D, Lagomarsino, V, Lansonneur, P, Lebrun, P, Malbrunot, C, Mariazzi, S, Matveev, V, Mazzotta, Z, Müller, S. R, Nebbia, G, Nedelec, P, Oberthaler, M, Pacifico, N, Pagano, D, Penasa, L, Petracek, V, Prevedelli, Marco, Ravelli, L, Rienaecker, B, Robert, J, Røhne, O. M, Rotondi, A, Sacerdoti, M, Sandaker, H, Santoro, R, Scampoli, P, Simon, M, Smestad, L, Sorrentino, F, Testera, G, Tietje, I. C, Widmann, E, Yzombard, P, Zimmer, C, Zmeskal, J, Zurlo, N., Prelz, F., Aghion, S., Amsler, C., Ariga, T., Bonomi, G., Brusa, R. S., Caccia, M., Caravita, R., Castelli, F., Cerchiari, G., Comparat, D., Consolati, G., Demetrio, A., Di Noto, L., Doser, M., Ereditato, A., Evans, C., Ferragut, R., Fesel, J., Fontana, A., Gerber, S., Giammarchi, M., Gligorova, A., Guatieri, F., Haider, S., Hinterberger, A., Holmestad, H., Kellerbauer, A., Krasnický, D., Lagomarsino, V., Lansonneur, P., Lebrun, P., Malbrunot, C., Mariazzi, S., Matveev, V., Mazzotta, Z., Müller, S. R., Nebbia, G., Nedelec, P., Oberthaler, M., Pacifico, N., Pagano, D., Penasa, L., Petracek, V., Prevedelli, M., Ravelli, L., Rienaecker, B., Robert, J., Rohne, O. M., Rotondi, A., Sacerdoti, M., Sandaker, H., Santoro, R., Scampoli, P., Simon, M., Smestad, L., Sorrentino, F., Testera, G., Tietje, I. C., Widmann, E., Yzombard, P., Zimmer, C., and Zmeskal, J.
Subjects: 0301 basic medicine, History, Data collection, Multicast, 530 Physics, data acquisition, Detector, 02 engineering and technology, 021001 nanoscience & nanotechnology, computer.software_genre, Data type, Computer Science Applications, Education, 03 medical and health sciences, Physics and Astronomy (all), 030104 developmental biology, Data acquisition, Data logger, Operating system, Software system, 0210 nano-technology, Representation (mathematics), computer
Abstract: In the sociology of small- to mid-sized (O(100) collaborators) experiments the issue of data collection and storage is sometimes felt as a residual problem for which well-established solutions are known. Still, the DAQ system can be one of the few forces that drive towards the integration of otherwise loosely coupled detector systems. As such it may be hard to complete with off-the-shelf components only. LabVIEW and ROOT are the (only) two software systems that were assumed to be familiar enough to all collaborators of the AEḡIS (AD6) experiment at CERN: working out of the GXML representation of LabVIEW Data types, a semantically equivalent representation as ROOT TTrees was developed for permanent storage and analysis. All data in the experiment is cast into this common format and can be produced and consumed on both systems and transferred over TCP and/or multicast over UDP for immediate sharing over the experiment LAN. We describe the setup that has been able to cater to all run data logging and long term monitoring needs of the AEḡIS experiment so far.
Published: 2017

32. The AEgIS experiment: towards antimatter gravity measurements

Author: Ole Røhne, G. Nebbia, Giovanni Consolati, Marco Prevedelli, M. Antonello, Germano Bonomi, F. Prelz, I. C. Tietje, M. Vujanovic, O. Khalidova, Daniel Comparat, A. Camper, S. Haider, Ruggero Caravita, Sebastiano Mariazzi, Massimo Caccia, Johann Marton, V. Petráček, V. A. Matveev, Marco Giammarchi, Eberhard Widmann, V. Lagomarsino, B. Rienaecker, A. S. Belov, D. Krasnický, A. Demetrio, P. Lebrun, A. Hinterberger, M. Oberthaler, Lea Di Noto, C. Evans, P. Yzombard, J. Fesel, Alban Kellerbauer, G. Testera, Angela Gligorova, P. Hackstock, Andrea Fontana, L. Smestad, Felice Sorrentino, P. Lansonneur, Stefano Aghion, R. S. Brusa, S.R. Müller, Patrick Nedelec, Claude Amsler, Johann Zmeskal, Romualdo Santoro, Luca Penasa, M. Fanì, Giovanni Cerchiari, Nicola Zurlo, Chloé Malbrunot, Rafael Ferragut, Heidi Sandaker, Fabrizio Castelli, Alberto Rotondi, Michael Doser, H. Holmestad, J. Robert, Davide Pagano, C. Zimmer, Sebastian Gerber, F. Guatieri, Laboratoire Aimé Cotton (LAC), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), AEgIS, Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Physics::General Physics, History, CERN Lab, electric field: gradient, General relativity, positronium, antihydrogen: beam, 01 natural sciences, 010305 fluids & plasmas, Education, Nuclear physics, symbols.namesake, Gravitational field, 0103 physical sciences, Physics::Atomic and Molecular Clusters, general relativity, Physics::Atomic Physics, Equivalence principle, 010306 general physics, Antihydrogen, Physics, Large Hadron Collider, General Relativity and Cosmology, antimatter: gravitation, charge exchange, pulsed, anti-p, Computer Science Applications, Automatic Keywords, interpretation of experiments, equivalence principle, Antiproton, Antimatter, [PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc], Rydberg formula, symbols
Abstract: AE g ¯ IS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) is a CERN based experiment aiming to probe the Weak Equivalence Principle of General Relativity with antimatter by studying free fall of antihydrogen in the Earth’s gravitational field. A pulsed cold beam of antihydrogen produced by charge exchange between Rydberg positronium and cold antiprotons will be horizontally accelerated by an electric field gradient. The free fall of antihydrogen will then be measured by a classical moire deflectometer. An overview of the experimental setup, present status of the experiment along with current achievements and results is presented.
Published: 2019

33. Development of nuclear emulsions with 1μm spatial resolution for the AEgIS experiment

Author: M. Kimura, F. Moia, G. Nebbia, A. Knecht, Sandra Zavatarelli, Simone Cialdi, D. Krasnický, T. Kaltenbacher, Davide Trezzi, E. Jordan, Marco Prevedelli, A. S. Belov, Tomoko Ariga, Heidi Sandaker, Sebastiano Mariazzi, Paola Scampoli, S. Haider, P. Genova, S. Di Domizio, G. Testera, V. Lagomarsino, James William Storey, G. Burghart, Giovanni Consolati, Germano Bonomi, Fabrizio Castelli, Claude Amsler, R. Vaccarone, M. Spacek, Vojtech Petracek, Marco Giammarchi, Rafael Ferragut, Cristina Riccardi, Michael Doser, C. Regenfus, Alberto Rotondi, Subieta Vasquez, Giovanni Cerchiari, Carlo Canali, Jiro Kawada, L. V. Jørgensen, L. Di Noto, Alban Kellerbauer, R. S. Brusa, Antonio Ereditato, P. Bräunig, Stefano Aghion, S. D. Hogan, N. Pacifico, L. Cabaret, T. Huse, Frédéric Merkt, Alexey Dudarev, Angela Gligorova, Patrick Nedelec, Akitaka Ariga, Adriano Fontana, Ole Røhne, J. Bremer, O. Ahlén, F. Prelz, Daniel Comparat, S. N. Gninenko, C. Pistillo, Ruggero Caravita, V. A. Matveev, and Markus K. Oberthaler
Subjects: Physics, Physics::General Physics, Nuclear and High Energy Physics, Large Hadron Collider, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Vacuum tube, Detector, Position sensitive device, Gravitational acceleration, 01 natural sciences, 7. Clean energy, law.invention, Nuclear physics, law, Antimatter, 0103 physical sciences, Nuclear emulsion, 010306 general physics, Antihydrogen, Instrumentation
Abstract: The main goal of the AEgIS experiment at CERN is to test the weak equivalence principle for antimatter. We will measure the Earth's gravitational acceleration g with antihydrogen atoms being launched in a horizontal vacuum tube and traversing a moire deflectometer. We intend to use a position sensitive device made of nuclear emulsions (combined with a time-of-flight detector such as silicon μ� strips) to
Published: 2013

34. Particle tracking at 4 K: The Fast Annihilation Cryogenic Tracking (FACT) detector for the AEgIS antimatter gravity experiment

Author: G. Nebbia, A. Magnani, Simone Cialdi, Davide Trezzi, Paola Scampoli, M. Kimura, E. Jordan, P. Bräunig, James William Storey, M. A. Subieta Vasquez, Alban Kellerbauer, A. S. Belov, F. Moia, Claude Amsler, Sebastiano Mariazzi, R. Vaccarone, Vojtech Petracek, R. S. Brusa, D. Krasnický, T. Kaltenbacher, O. Ahlén, Jiro Kawada, L. Di Noto, G. Testera, Tomoko Ariga, Cristina Riccardi, A. Knecht, F. Prelz, Sandra Zavatarelli, P. Genova, S. Di Domizio, Giovanni Cerchiari, V. Lagomarsino, Fabrizio Castelli, S. Haider, Daniel Comparat, Michael Doser, J. Bremer, Stefano Aghion, Marco Giammarchi, Ole Røhne, N. Pacifico, Patrick Nedelec, Rafael Ferragut, L. V. Jørgensen, Carlo Canali, C. Regenfus, M.P. Carante, Angela Gligorova, Antonio Ereditato, Markus K. Oberthaler, C. Pistillo, Ruggero Caravita, Adriano Fontana, Alberto Rotondi, G. Burghart, L. Cabaret, T. Huse, Giovanni Consolati, Heidi Sandaker, V. A. Matveev, Germano Bonomi, M. Spacek, Frédéric Merkt, Alexey Dudarev, S. N. Gninenko, S. D. Hogan, Marco Prevedelli, L. Dassa, Akitaka Ariga, Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), AEGIS, J. Storey, C. Canali, S. Aghion, O. Ahlén, C. Amsler, A. Ariga, T. Ariga, A.S. Belov, G. Bonomi, P. Bräunig, J. Bremer, R.S. Brusa, G. Burghart, L. Cabaret, M. Carante, R. Caravita, F. Castelli, G. Cerchiari, S. Cialdi, D. Comparat, G. Consolati, L. Dassa, S. Di Domizio, L. Di Noto, M. Doser, A. Dudarev, A. Ereditato, R. Ferragut, A. Fontana, P. Genova, M. Giammarchi, A. Gligorova, S.N. Gninenko, S. Haider, S.D. Hogan, T. Huse, E. Jordan, L.V. Jørgensen, T. Kaltenbacher, J. Kawada, A. Kellerbauer, M. Kimura, A. Knecht, D. Krasnický, V. Lagomarsino, A. Magnani, S. Mariazzi, V.A. Matveev, F. Merkt, F. Moia, G. Nebbia, P. Nédélec, M.K. Oberthaler, N. Pacifico, V. Petráček, C. Pistillo, F. Prelz, M. Prevedelli, C. Regenfu, C. Riccardi, O. Røhne, A. Rotondi, H. Sandaker, P. Scampoli, M.A. Subieta Vasquez, M. Špaček, G. Testera, D. Trezzi, R. Vaccarone, S. Zavatarelli, J., Storey, C., Canali, S., Aghion, O., Ahl?n, C., Amsler, A., Ariga, T., Ariga, A. S., Belov, G., Bonomi, P., Br?unig, J., Bremer, R. S., Brusa, G., Burghart, L., Cabaret, M., Carante, R., Caravita, F., Castelli, G., Cerchiari, S., Cialdi, D., Comparat, G., Consolati, L., Dassa, S., Di Domizio, L., Di Noto, M., Doser, A., Dudarev, A., Ereditato, R., Ferragut, A., Fontana, P., Genova, M., Giammarchi, A., Gligorova, S. N., Gninenko, S., Haider, S. D., Hogan, T., Huse, E., Jordan, L. V., J?rgensen, T., Kaltenbacher, J., Kawada, A., Kellerbauer, M., Kimura, A., Knecht, D., Krasnick?, V., Lagomarsino, A., Magnani, S., Mariazzi, V. A., Matveev, F., Merkt, F., Moia, G., Nebbia, P., N?d?lec, M. K., Oberthaler, N., Pacifico, V., Petr??ek, C., Pistillo, F., Prelz, M., Prevedelli, C., Regenfu, C., Riccardi, O., R?hne, A., Rotondi, H., Sandaker, Scampoli, Paola, M. A., Subieta Vasquez, M., ?pa?ek, G., Testera, D., Trezzi, R., Vaccarone, and S., Zavatarelli
Subjects: Cryostat, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Gravity, Scintillator, Tracking (particle physics), 01 natural sciences, 7. Clean energy, Nuclear physics, Silicon photomultiplier, 0103 physical sciences, Antihydrogen, Scintillators, Tracking, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Instrumentation, Physics, Scintillation, 010308 nuclear & particles physics, Detector, GRAVITATION, Antimatter, PARTICLE PHYSICS
Abstract: see paper for full list of authors; International audience; The AEgIS experiment is an international collaboration with the main goal of performing the first direct measurement of the Earth's gravitational acceleration on antimatter. Critical to the success of AEgIS is the production of cold antihydrogen (View the MathML source) atoms. The FACT detector is used to measure the production and temperature of the View the MathML source atoms and for establishing the formation of a View the MathML source beam. The operating requirements for this detector are very challenging: it must be able to identify each of the thousand or so annihilations in the 1 ms period of pulsed View the MathML source production, operate at 4 K inside a 1 T solenoidal field and not produce more than 10 W of heat. The FACT detector consists of two concentric cylindrical layers of 400 scintillator fibres with a 1 mm diameter and a 0.6 mm pitch. The scintillating fibres are coupled to clear fibres which transport the scintillation light to 800 silicon photomultipliers. Each silicon photomultiplier signal is connected to a linear amplifier and a fast discriminator, the outputs of which are sampled continuously by Field Programmable Gate Arrays (FPGAs). In the course of the developments for the FACT detector we have established the performance of scintillating fibres at 4 K by means of a cosmic-ray tracker operating in a liquid helium cryostat. The FACT detector was installed in the AEgIS apparatus in December 2012 and will be used to study the View the MathML source formation when the low energy antiproton physics programs resume at CERN in the Summer of 2014. This paper presents the design requirements and construction methods of the FACT detector and provides the first results of the detector commissioning.
Published: 2013

35. Development of nuclear emulsions with spatial resolution for the AEgIS experiment

Author: M. Kimura, S. Aghion, O. Ahl?n, C. Amsler, A. Ariga, T. Ariga, A. S. Belov, G. Bonomi, P. Br?unig, J. Bremer, R. S. Brusa, G. Burghart, L. Cabaret, C. Canali, R. Caravita, F. Castelli, G. Cerchiari, S. Cialdi, D. Comparat, G. Consolati, S. Di Domizio, L. Di Noto, M. Doser, A. Dudarev, A. Ereditato, R. Ferragut, A. Fontana, P. Genova, M. Giammarchi, A. Gligorova, S. N. Gninenko, S. Haider, S. D. Hogan, T. Huse, E. Jordan, L. V. J?rgensen, T. Kaltenbacher, J. Kawada, A. Kellerbauer, A. Knecht, D. Krasnick?, V. Lagomarsino, S. Mariazzi, V. A. Matveev, F. Merkt, F. Moia, G. Nebbia, P. N?d?lec, M. K. Oberthaler, N. Pacifico, V. Petr??ek, C. Pistillo, F. Prelz, M. Prevedelli, C. Regenfus, C. Riccardi, O. R?hne, A. Rotondi, H. Sandaker, J. Storey, M. A. Subieta Vasquez, M. ?pa?ek, G. Testera, D. Trezzi, R. Vaccarone, S. Zavatarelli, SCAMPOLI, PAOLA, M. Kimura, S. Aghion, O. Ahlén, C. Amsler, A. Ariga, T. Ariga, A.S. Belov, G. Bonomi, P. Bräunig, J. Bremer, R.S. Brusa, G. Burghart, L. Cabaret, C. Canali, R. Caravita, F. Castelli, G. Cerchiari, S. Cialdi, D. Comparat, G. Consolati, S. Di Domizio, L. Di Noto, M. Doser, A. Dudarev, A. Ereditato, R. Ferragut, A. Fontana, P. Genova, M. Giammarchi, A. Gligorova, S.N. Gninenko, S. Haider, S.D. Hogan, T. Huse, E. Jordan, L.V. Jørgensen, T. Kaltenbacher, J. Kawada, A. Kellerbauer, A. Knecht, D. Krasnický, V. Lagomarsino, S. Mariazzi, V.A. Matveev, F. Merkt, F. Moia, G. Nebbia, P. Nédélec, M.K. Oberthaler, N. Pacifico, V. Petráček, C. Pistillo, F. Prelz, M. Prevedelli, C. Regenfu, C. Riccardi, O. Røhne, A. Rotondi, H. Sandaker, P. Scampoli, J. Storey, M.A. Subieta Vasquez, M. Špaček, G. Testera, D. Trezzi, R. Vaccarone, S. Zavatarelli, M., Kimura, S., Aghion, O., Ahl?n, C., Amsler, A., Ariga, T., Ariga, A. S., Belov, G., Bonomi, P., Br?unig, J., Bremer, R. S., Brusa, G., Burghart, L., Cabaret, C., Canali, R., Caravita, F., Castelli, G., Cerchiari, S., Cialdi, D., Comparat, G., Consolati, S., Di Domizio, L., Di Noto, M., Doser, A., Dudarev, A., Ereditato, R., Ferragut, A., Fontana, P., Genova, M., Giammarchi, A., Gligorova, S. N., Gninenko, S., Haider, S. D., Hogan, T., Huse, E., Jordan, L. V., J?rgensen, T., Kaltenbacher, J., Kawada, A., Kellerbauer, A., Knecht, D., Krasnick?, V., Lagomarsino, S., Mariazzi, V. A., Matveev, F., Merkt, F., Moia, G., Nebbia, P., N?d?lec, M. K., Oberthaler, N., Pacifico, V., Petr??ek, C., Pistillo, F., Prelz, M., Prevedelli, C., Regenfu, C., Riccardi, O., R?hne, A., Rotondi, H., Sandaker, Scampoli, Paola, J., Storey, M. A., Subieta Vasquez, M., ?pa?ek, G., Testera, D., Trezzi, R., Vaccarone, and S., Zavatarelli
Subjects: Physics::Instrumentation and Detectors, ELEMENTARY PARTICLE PHYSICS, GRAVITATION, Nuclear Experiment
Abstract: The main goal of the AEgIS experiment at CERN is to test the weak equivalence principle for antimatter. We will measure the Earth's gravitational acceleration g with antihydrogen atoms being launched in a horizontal vacuum tube and traversing a moiré deflectometer. We intend to use a position sensitive device made of nuclear emulsions (combined with a time-of-flight detector such as silicon μ-strips) to measure precisely their annihilation points at the end of the tube. The goal is to determine g with a 1% relative accuracy. In 2012 we tested emulsion films in vacuum and at room temperature with low energy antiprotons from the CERN antiproton decelerator. First results on the expected performance for AEgIS are presented.
Published: 2013

36. AEgIS Experiment Commissioning at CERN

Author: Alban Kellerbauer, Daniel Comparat, S. D. Hogan, M. Kimura, L. V. Jo, Cristina Riccardi, G. Nebbia, Thomas Kaltenbacher, D. Krasnický, P. Bräunig, C. Regenfus, Markus K. Oberthaler, L. Dassa, S. Di Domizio, Fabio Villa, Akitaka Ariga, Sebastiano Mariazzi, Tomoko Ariga, Marco Giammarchi, Giovanni Cerchiari, Marco Prevedelli, P. Genova, Sergei Gninenko, F. Prelz, G. Testera, Simone Cialdi, Andrea Fontana, E. Jordan, S. Haider, Fabrizio Castelli, A. S. Belov, Viktor Matveev, Antonio Ereditato, Michael Doser, Frédéric Merkt, L. Cabaret, Alexey Dudarev, Rafael Ferragut, hne, O. Ro, Heidi Sandaker, G. Burghart, Angela Gligorova, Giovanni Consolati, Germano Bonomi, Sandra Zavatarelli, M. Spacek, C. Pistillo, Ruggero Caravita, J. Bremer, Alberto Rotondi, Patrick Nedelec, rgensen, Paola Scampoli, James William Storey, M. A. Subieta Vasquez, Claude Amsler, R. Vaccarone, F. Moia, Stefano Aghion, R. S. Brusa, N. Pacifico, V. Lagomarsino, Carlo Canali, Jiro Kawada, L. Di Noto, Massimo Caccia, V. Petráček, Laboratoire Aimé Cotton (LAC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), AEGIS, D., Krasnicky?, S., Aghion, C., Amsler, A., Ariga, T., Ariga, A. S., Belov, G., Bonomi, P., Bra?unig, R. S., Brusa, J., Bremer, G., Burghart, L., Cabaret, M., Caccia, C., Canali, R., Caravita, F., Castelli, G., Cerchiari, S., Cialdi, D., Comparat, G., Consolati, L., Dassa, S., Di Domizio, L., Di Noto, M., Doser, A., Dudarev, A., Ereditato, R., Ferragut, A., Fontana, P., Genova, M., Giammarchi, A., Gligorova, S. N., Gninenko, S. D., Hogan, S., Haider, E., Jordan, L. V., Jo?rgensen, T., Kaltenbacher, J., Kawada, A., Kellerbauer, M., Kimura, V., Lagomarsino, S., Mariazzi, V. A., Matveev, F., Merkt, F., Moia, G., Nebbia, P., Ne?de?lec, M. K., Oberthaler, N., Pacifico, V., Petra?c?ek, C., Pistillo, F., Prelz, M., Prevedelli, C., Regenfu, C., Riccardi, O., Ro?hne, A., Rotondi, H., Sandaker, Scampoli, Paola, J., Storey, M. A., Subieta Vasquez, M., S?pac?ek, G., Testera, R., Vaccarone, F., Villa, S., Zavatarelli, D. Krasnický, S. Aghion, C. Amsler, A. Ariga, T. Ariga, A. S. Belov, G. Bonomi, P. Bräunig, R. S. Brusa, J. Bremer, G. Burghart, L. Cabaret, M. Caccia, C. Canali, R. Caravita, F. Castelli, G. Cerchiari, S. Cialdi, D. Comparat, G. Consolati, L. Dassa, S. Di Domizio, L. Di Noto, M. Doser, A. Dudarev, A. Ereditato, R. Ferragut, A. Fontana, P. Genova, M. Giammarchi, A. Gligorova, S. N. Gninenko, S. D. Hogan, S. Haider, E. Jordan, L. V. Jo̸rgensen, T. Kaltenbacher, J. Kawada, A. Kellerbauer, M. Kimura, V. Lagomarsino, S. Mariazzi, V. A. Matveev, F. Merkt, F. Moia, G. Nebbia, P. Nédélec, M. K. Oberthaler, N. Pacifico, V. Petráček, C. Pistillo, F. Prelz, M. Prevedelli, C. Regenfu, C. Riccardi, O. Ro̸hne, A. Rotondi, H. Sandaker, P. Scampoli, J. Storey, M. A. Subieta Vasquez, M. Špaček, G. Testera, R. Vaccarone, F. Villa, and S. Zavatarelli
Subjects: Physics::General Physics, Antimatter, Penning trap, Gravity, Gravitational acceleration, Positronium, 7. Clean energy, 01 natural sciences, AEgIS, Antihydrogen, Nuclear physics, Laser cooling, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Physics::Atomic Physics, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, GeneralLiterature_REFERENCE(e.g.,dictionaries,encyclopedias,glossaries), ComputingMilieux_MISCELLANEOUS, Physics, Large Hadron Collider, 010308 nuclear & particles physics, ELEMENTARY PARTICLE PHYSICS, GRAVITATION, Deflection (physics), Antiproton, Physics::Accelerator Physics
Abstract: The AEgIS Experiment is an international collaboration based at CERN whose aim is to perform the first direct measurement of the gravitational acceleration g of antihydrogen in the gravitational field of the Earth. Cold antihydrogen will be produced with a pulsed charge exchange reaction in a cylindrical Penning trap where antiprotons will be cooled to 100mK. The cold antihydrogen will be produced in an excited Rydberg state and subsequently formed into a beam. The deflection of the antihydrogen beam will be measured by using Moiré deflectometer gratings. After being approved in late 2008, AEgIS started taking data in a commissioning phase early 2012. This report presents an overview of the AEgIS experiment, describes its current status and shows the first measurements on antiproton catching and cooling in the 5 T Penning catching trap. We will also present details on the techniques needed for the 100mK antihydrogen production, such as pulsed positronium production and its excitation with lasers.
Published: 2012

37. Laser excitation of then=3level of positronium for antihydrogen production

Author: B. Rienäcker, Roberto S. Brusa, S. Vamosi, V. Petracek, Luca Penasa, I. L. Jernelv, Giovanni Cerchiari, L. Cabaret, Alberto Rotondi, T. Huse, L. Di Noto, Paola Scampoli, G. Nebbia, M. Sacerdoti, James William Storey, Sergei Gninenko, Claude Amsler, Marco Prevedelli, V. Lagomarsino, I. C. Tietje, Simone Cialdi, M. Kimura, Adriano Fontana, E. Jordan, Sebastian Gerber, Heidi Sandaker, K. Chlouba, Sebastiano Mariazzi, Giovanni Consolati, Germano Bonomi, A. Demetrio, F. Guatieri, Massimo Caccia, M. Spacek, L. Resch, Nicola Zurlo, C. Evans, P. Bräunig, J. Bremer, F. Prelz, Viktor Matveev, E. Widmann, C. Pistillo, Ruggero Caravita, Akitaka Ariga, Ola Kenji Forslund, Davide Pagano, Rafael Ferragut, S. Haider, Daniel Comparat, Alexey Dudarev, J. Fesel, Ole Røhne, Romualdo Santoro, Stefano Aghion, Marco Giammarchi, Sebastian Lehner, Z. Mazzotta, Felice Sorrentino, Alban Kellerbauer, Chloé Malbrunot, P. Lebrun, D. Krasnicky, L. Marx, Nicola Pacifico, P. Lansonneur, L. Ravelli, I. M. Strojek, T. Koettig, Lillian Smestad, H. Holmestad, Antonio Ereditato, Tomoko Ariga, G. Testera, Fabrizio Castelli, Patrick Nedelec, Michael Doser, Johann Zmeskal, J. Liberadzka, M. Oberthaler, Angela Gligorova, P. Yzombard, Aghion, S., Amsler, C., Ariga, A., Ariga, T., Bonomi, G., Bräunig, P., Bremer, J., Brusa, R. S., Cabaret, L., Caccia, M., Caravita, R., Castelli, F., Cerchiari, G., Chlouba, K., Cialdi, S., Comparat, D., Consolati, G., Demetrio, A., Di Noto, L., Doser, M., Dudarev, A., Ereditato, A., Evans, C., Ferragut, R., Fesel, J., Fontana, A., Forslund, O. K., Gerber, S., Giammarchi, M., Gligorova, A., Gninenko, S., Guatieri, F., Haider, S., Holmestad, H., Huse, T., Jernelv, I. L., Jordan, E., Kellerbauer, A., Kimura, M., Koettig, T., Krasnicky, D., Lagomarsino, V., Lansonneur, P., Lebrun, P., Lehner, S., Liberadzka, J., Malbrunot, C., Mariazzi, S., Marx, L., Matveev, V., Mazzotta, Z., Nebbia, G., Nedelec, P., Oberthaler, M., Pacifico, N., Pagano, D., Penasa, L., Petracek, V., Pistillo, C., Prelz, F., Prevedelli, Marco, Ravelli, L., Resch, L., Rienäcker, B., Røhne, O. M., Rotondi, A., Sacerdoti, M., Sandaker, H., Santoro, R., Scampoli, P., Smestad, L., Sorrentino, F., Spacek, M., Storey, J., Strojek, I. M., Testera, G., Tietje, I., Vamosi, S., Widmann, E., Yzombard, P., Zmeskal, J., Zurlo, N., Prevedelli, M., Scampoli, Paola, Laboratoire Aimé Cotton (LAC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and AEGIS
Subjects: COLLISIONS, Atomic and Molecular Physics, and Optics, ANNIHILATION LIFETIME, SLOW POSITRONS, TRANSITION, PHYSICS, ANTIPROTONS, TRANSPORT, PLASMA, STATES, 530 Physics, Spectroscopy, particle physics, 01 natural sciences, 010305 fluids & plasmas, law.invention, Positronium, Nuclear physics, law, Atomic and Molecular Physics, 0103 physical sciences, Physics::Atomic and Molecular Clusters, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Physics::Atomic Physics, 010306 general physics, Antihydrogen, Physics, Plasma, Laser, Atomic and Molecular Physics, and Optics, Antiproton, and Optics, Atomic physics, ANNIHILATION LIFETIME, Particle Physics - Experiment, Excitation
Abstract: We demonstrate laser excitation of the n=3 state of positronium (Ps) in vacuum. A specially designed high-efficiency pulsed slow positron beam and single shot positronium annihilation lifetime spectroscopy were used to produce and detect Ps. Pulsed laser excitation of n=3 level at 205 nm was monitored via Ps photoionization induced by a second intense laser pulse at 1064 nm. About 15% of the overall positronium emitted in vacuum was excited to n=3 and photoionized. Saturation of both the n=3 excitation and the following photoionization was observed and is explained by a simple rate equation model. Scanning the laser frequency allowed us to extract the positronium transverse temperature related to the width of the Doppler-broadened line. Moreover, preliminary observation of excitation to Rydberg states (n = 15...17) using n=3 as intermediate level was observed, giving an independent confirmation of efficient excitation to the 33P state. We demonstrate the laser excitation of the n=3 state of positronium (Ps) in vacuum. A combination of a specially designed pulsed slow positron beam and a high-efficiency converter target was used to produce Ps. Its annihilation was recorded by single-shot positronium annihilation lifetime spectroscopy. Pulsed laser excitation of the n=3 level at a wavelength λ≈205 nm was monitored via Ps photoionization induced by a second intense laser pulse at λ=1064 nm. About 15% of the overall positronium emitted into vacuum was excited to n=3 and photoionized. Saturation of both the n=3 excitation and the following photoionization was observed and explained by a simple rate equation model. The positronium's transverse temperature was extracted by measuring the width of the Doppler-broadened absorption line. Moreover, excitation to Rydberg states n=15 and 16 using n=3 as the intermediate level was observed, giving an independent confirmation of excitation to the $3^{3}P$ state.
Published: 2016

38. Measuring GBAR with emulsion detector

Author: S. N. Gninenko, Jiro Kawada, L. Di Noto, P. Genova, Alexey Dudarev, Eberhard Widmann, V. Lagomarsino, F. Prelz, V. Petráček, Giovanni Consolati, Germano Bonomi, Akitaka Ariga, Paola Scampoli, M. A. Subieta Vasquez, M. Spacek, Patrick Nedelec, Heidi Sandaker, Johann Zmeskal, O. Ahlén, A. Rotondi, Claude Amsler, Marco Prevedelli, Ole Røhne, Daniel Comparat, Giovanni Cerchiari, N. Pacifico, H. Derking, Stefano Aghion, C. Pistillo, L. V. Jørgensen, Ruggero Caravita, Adriano Fontana, Simone Cialdi, E. Jordan, M. Kimura, L. Cabaret, T. Huse, J. Bremer, A. S. Belov, Tomoko Ariga, Rafael Ferragut, Cristina Riccardi, T. Kaltenbacher, Carlo Canali, Antonio Ereditato, Sebastian Lehner, C. Regenfus, P. Bräunig, M. Oberthaler, Angela Gligorova, P. Yzombard, G. Testera, D. Krasniký, S. Haider, R. S. Brusa, Karl Berggren, Fabrizio Castelli, Alice Magnani, Michael Doser, Viktor Matveev, J. Storet, S. Di Domizio, Marco Giammarchi, Alban Kellerbauer, G. Nebbia, C. Malbrunot, Sebastiano Mariazzi, A. Knecht, S. Zavaterelli, T., Ariga, S., Aghion, O., Ahl?n, C., Amsler, A., Ariga, A. S., Belov, K., Berggren, G., Bonomi, P., Br?unig, J., Bremer, R. S., Brusa, L., Cabaret, C., Canali, R., Caravita, F., Castelli, G., Cerchiari, S., Cialdi, D., Comparat, G., Consolati, H., Derking, S., Di Domizio, L., Di Noto, M., Doser, A., Dudarev, A., Ereditato, R., Ferragut, A., Fontana, P., Genova, M., Giammarchi, A., Gligorova, S. N., Gninenko, S., Haider, T., Huse, E., Jordan, L. V., J?rgensen, T., Kaltenbacher, J., Kawada, A., Kellerbauer, M., Kimura, A., Knecht, D., Krasnik?, V., Lagomarsino, S., Lehner, A., Magnani, C., Malbrunot, S., Mariazzi, V. A., Matveev, G., Nebbia, P., N?d?lec, M. K., Oberthaler, N., Pacifico, V., Petr??ek, C., Pistillo, F., Prelz, M., Prevedelli, C., Regenfu, C., Riccardi, O., R?hne, A., Rotondi, H., Sandaker, Scampoli, Paola, J., Storet, M. A., Subieta Vasquez, M., ?pa?ek, G., Testera, E., Widmann, P., Yzombard, S., Zavaterelli, J., Zmeskal, AEGIS, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire Aimé Cotton (LAC), and École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Particle physics, Antimatter, Annihilation, Physics::Instrumentation and Detectors, Position resolution, 530 Physics, Detector, Gravitational acceleration, Vertex (geometry), gravity, Nuclear physics, particle tracking detectors, emulsion detectors, Emulsion, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Antihydrogen, GeneralLiterature_REFERENCE(e.g.,dictionaries,encyclopedias,glossaries), ComputingMilieux_MISCELLANEOUS
Abstract: The motivation of the AEgIS experiment is to test the universality of free fall with antimatter. The goal is to reach a relative uncertainty of 1% for the measurement of the earth's gravitational acceleration [Formula: see text] on an antihydrogen beam. High vertex position resolution is required for a position detector. An emulsion based detector can measure the annihilation vertex of antihydrogen atoms with a resolution of 1-2 μm, which if realized in the actual experiment will enable a 1% measurement of [Formula: see text] with less than 1000 [Formula: see text] atoms. Developments and achievements on emulsion detectors for the AEgIS experiment are presented here.
Published: 2014

39. Measuring g with Aegis, Progress and Perspectives

Author: D. Krasnick?, S. Aghion, O. Ahl?n, C. Amsler, A. Ariga, T. Ariga, A. S. Belov, K. Berggren, G. Bonomi, P. Br?unig, J. Bremer, R. S. Brusa, L. Cabaret, C. Canali, R. Caravita, F. Castelli, G. Cerchiari, S. Cialdi, D. Comparat, G. Consolati, H. Derking, S. Di Domizio, L. Di Noto, M. Doser, A. Dudarev, A. Ereditato, R. Ferragut, A. Fontana, P. Genova, M. Giammarchi, A. Gligorova, S. N. Gninenko, S. Haider, T. Huse, E. Jordan, L. V. J?rgensen, T. Kaltenbacher, J. Kawada, A. Kellerbauer, M. Kimura, A. Knecht, V. Lagomarsino, S. Lehner, A. Magnani, C. Malbrunot, S. Mariazzi, V. A. Matveev, G. Nebbia, P. N?d?lec, M. K. Oberthaler, N. Pacifico, V. Petr??ek, C. Pistillo, F. Prelz, M. Prevedelli, C. Regenfus, C. Riccardi, O. R?hne, A. Rotondi, H. Sandaker, J. Storey, M. A. Subieta Vasquez, M. ?pa?ek, G. Testera, E. Widmann, P. Yzombard, S. Zavatarelli, J. Zmeskal, SCAMPOLI, PAOLA, D., Krasnick?, S., Aghion, O., Ahl?n, C., Amsler, A., Ariga, T., Ariga, A. S., Belov, K., Berggren, G., Bonomi, P., Br?unig, J., Bremer, R. S., Brusa, L., Cabaret, C., Canali, R., Caravita, F., Castelli, G., Cerchiari, S., Cialdi, D., Comparat, G., Consolati, H., Derking, S., Di Domizio, L., Di Noto, M., Doser, A., Dudarev, A., Ereditato, R., Ferragut, A., Fontana, P., Genova, M., Giammarchi, A., Gligorova, S. N., Gninenko, S., Haider, T., Huse, E., Jordan, L. V., J?rgensen, T., Kaltenbacher, J., Kawada, A., Kellerbauer, M., Kimura, A., Knecht, V., Lagomarsino, S., Lehner, A., Magnani, C., Malbrunot, S., Mariazzi, V. A., Matveev, G., Nebbia, P., N?d?lec, M. K., Oberthaler, N., Pacifico, V., Petr??ek, C., Pistillo, F., Prelz, M., Prevedelli, C., Regenfu, C., Riccardi, O., R?hne, A., Rotondi, H., Sandaker, Scampoli, Paola, J., Storey, M. A., Subieta Vasquez, M., ?pa?ek, G., Testera, E., Widmann, P., Yzombard, S., Zavatarelli, and J., Zmeskal
Abstract: AE¯gIS experiment’s main goal is to measure the local gravitational acceleration of antihydrogen ¯g and thus perform a direct test of the weak equivalence principle with antimatter. In the first phase of the experiment the aim is to measure ¯g with 1% relative precision. This paper presents the antihydrogen production method and a description of some components of the experiment, which are necessary for the gravity measurement. Current status of the AE¯gIS experimental apparatus is presented and recent commissioning results with antiprotons are outlined. In conclusion we discuss the short-term goals of the AE¯gIS collaboration that will pave the way for the first gravity measurement in the near future.
Published: 2014

40. AEgIS Experiment: Measuring the acceleration g of the earth’s gravitational field on antihydrogen beam

Author: L. Bravina, M. A. Subieta Vasquez, S. Aghion, O. Ahlén, C. Amsler, A. Ariga, T. Ariga, A. S. Belov, G. Bonomi, P. Bräunig, J. Bremer, R. S. Brusa, L. Cabaret, M. Caccia, C. Canali, R. Caravita, F. Castelli, G. Cerchiari, S. Cialdi, D. Comparat, G. Consolati, L. Dassa, J. H. Derking, S. Di Domizio, L. Di Noto, M. Doser, A. Dudarev, A. Ereditato, R. Ferragut, A. Fontana, P. Genova, M. Giammarchi, A. Gligorova, S. N. Gninenko, S. Heider, S. D. Hogan, T. Huse, E. Jordan, L. V. Jørgensen, T. Kaltenbacher, J. Kawada, A. Kellerbauer, M. Kimura, A. Knecht, D. Krasnický, V. Lagomarsino, S. Mariazzi, V. A. Matveev, F. Merkt, F. Moia, G. Nebbia, P. Nédélec, M. K. Oberthaler, N. Pacifico, V. Petráček, C. Pistilo, F. Prelz, M. Prevedelli, C. Regenfus, C. Ricardi, O. Røhne, A. Rotondi, H. Sandaker, J. Storey, M. Špaček, G. Testera, D. Trezzi, R. Vaccarone, F. Villa, S. Zavatarelli, Y. Foka, S. Kabana, SCAMPOLI, PAOLA, L., Bravina, M. A., Subieta Vasquez, S., Aghion, O., Ahlén, C., Amsler, A., Ariga, T., Ariga, A. S., Belov, G., Bonomi, P., Bräunig, J., Bremer, R. S., Brusa, L., Cabaret, M., Caccia, C., Canali, R., Caravita, F., Castelli, G., Cerchiari, S., Cialdi, D., Comparat, G., Consolati, L., Dassa, J. H., Derking, S., Di Domizio, L., Di Noto, M., Doser, A., Dudarev, A., Ereditato, R., Ferragut, A., Fontana, P., Genova, M., Giammarchi, A., Gligorova, S. N., Gninenko, S., Heider, S. D., Hogan, T., Huse, E., Jordan, L. V., Jørgensen, T., Kaltenbacher, J., Kawada, A., Kellerbauer, M., Kimura, A., Knecht, D., Krasnický, V., Lagomarsino, S., Mariazzi, V. A., Matveev, F., Merkt, F., Moia, G., Nebbia, P., Nédélec, M. K., Oberthaler, N., Pacifico, V., Petráček, C., Pistilo, F., Prelz, M., Prevedelli, C., Regenfu, C., Ricardi, O., Røhne, A., Rotondi, H., Sandaker, Scampoli, Paola, J., Storey, M., Špaček, G., Testera, D., Trezzi, R., Vaccarone, F., Villa, S., Zavatarelli, Y., Foka, and S., Kabana
Published: 2014

41. Detection of Low Energy Antiproton Annihilations in a Segmented Silicon Detector

Author: O. Ahlén, R. S. Brusa, Marco Prevedelli, G. Nebbia, Massimo Caccia, V. Petráček, V. Lagomarsino, Alban Kellerbauer, Sebastiano Mariazzi, L. Di Noto, P. Genova, Patrick Nedelec, Carsten Welsch, Carlo Canali, L. Cabaret, Giovanni Cerchiari, T. Huse, Alberto Rotondi, J. Bremer, C. Regenfus, J. Harasimowicz, Ole Røhne, Heidi Sandaker, Alice Magnani, Cristina Riccardi, G. Testera, F. Prelz, Simone Cialdi, D. Krasnický, T. Kaltenbacher, S. Haider, E. Jordan, Adriano Fontana, Rafael Ferragut, M. A. Subieta Vasquez, Fabrizio Castelli, S. Di Domizio, A. S. Belov, Alexey Dudarev, N. Pacifico, Michael Doser, Daniel Comparat, A. Knecht, A. Sosa, Stefano Aghion, Sandra Zavatarelli, Marco Giammarchi, L. V. Jørgensen, P. Bräunig, Angela Gligorova, Ruggero Caravita, V. A. Matveev, S. N. Gninenko, F. Moia, G. Burghart, Giovanni Consolati, Germano Bonomi, J. H. Derking, M. Spacek, S Aghion, O Ahlén, A S Belov, G Bonomi, P Bräunig, J Bremer, R S Brusa, G Burghart, L Cabaret, M Caccia, C Canali, R Caravita, F Castelli, G Cerchiari, S Cialdi, D Comparat, G Consolati, J H Derking, S Di Domizio, L Di Noto, M Doser, A Dudarev, R Ferragut, A Fontana, P Genova, M Giammarchi, A Gligorova, S N Gninenko, S Haider, J Harasimowicz, T Huse, E Jordan, L V JØrgensen, T Kaltenbacher, A Kellerbauer, A Knecht, D Krasnický, V Lagomarsino, A Magnani, S Mariazzi, V A Matveev, F Moia, G Nebbia, P Nédélec, N Pacifico, V Petráček, F Prelz, M Prevedelli, C Regenfu, C Riccardi, O RØhne, A Rotondi, H Sandaker, A Sosa, M A Subieta Vasquez, M Špaček, G Testera, C P Welsch, S Zavatarelli, AEGIS, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)
Subjects: Antiparticle, Physics::Instrumentation and Detectors, Detector modelling and simulations I (interaction of radiation with matter, Solid state detectors, Detector modelling and simulations I (interaction of radiation with matter, interaction of photons with matter, interaction of hadrons with matter, etc), 7. Clean energy, Particle detector, Nuclear physics, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Detectors and Experimental Techniques, Solid state detectors, Antihydrogen, GeneralLiterature_REFERENCE(e.g.,dictionaries,encyclopedias,glossaries), Instrumentation, ComputingMilieux_MISCELLANEOUS, Mathematical Physics, etc), Detector modelling and simulations I (interaction of radiation with matter, interaction of photons with matter, interaction of hadrons with matter, etc), Physics, Detector, Semiconductor detector, Antiproton Decelerator, interaction of hadrons with matter, Antiproton, Antimatter, High Energy Physics::Experiment
Abstract: The goal of the AEḡIS experiment at the Antiproton Decelerator (AD) at CERN, is to measure directly the Earth’s gravitational acceleration on antimatter by measuring the free fall of a pulsed, cold antihydrogen beam. The final position of the falling antihydrogen will be detected by a position sensitive detector. This detector will consist of an active silicon part, where the annihilations take place, followed by an emulsion part. Together, they allow to achieve 1% precision on the measurement of ḡ with about 600 reconstructed and time tagged annihilations. We present here the prospects for the development of the AEḡIS silicon position sentive detector and the results from the first beam tests on a monolithic silicon pixel sensor, along with a comparison to Monte Carlo simulations. publishedVersion
Published: 2014

42. Comparison of Planar and 3D Silicon Pixel Sensors Used for Detection of Low Energy Antiprotons

Author: A. Gligorova, R. Caravita, F. Castelli, G. Cerchiari, S. Cialdi, D. Comparat, G. Consolati, J. H. Derking, C. Da Via, S. Di Domizio, L. Di Noto, S. Aghion, M. Doser, A. Dudarev, R. Ferragut, A. Fontana, P. Genova, M. Giammarchi, S. N. Gninenko, S. Haider, H. Holmestad, T. Huse, A. S. Belov, E. Jordan, T. Kaltenbacher, A. Kellerbauer, A. Knecht, D. Krasnicky, V. Lagomarsino, S. Lehner, A. Magnani, C. Malbrunot, S. Mariazzi, G. Bonomi, V. A. Matveev, F. Moia, C. Nellist, G. Nebbia, P. Nedelec, M. Oberthaler, N. Pacifico, V. Petracek, F. Prelz, M. Prevedelli, P. Braunig, C. Riccardi, O. Rohne, A. Rotondi, H. Sandaker, M. A. Subieta Vasquez, M. Spacek, G. Testera, E. Widmann, P. Yzombard, S. Zavatarelli, J. Bremer, J. Zmeskal, R. S. Brusa, L. Cabaret, M. Caccia, A. Gligorova, S. Aghion, A. S. Belov, G. Bonomi, P. Braunig, J. Bremer, R. S. Brusa, L. Cabaret, M. Caccia, R. Caravita, F. Castelli, G. Cerchiari, S. Cialdi, D. Comparat, G. Consolati, J. H. Derking, C. Da Via, S. Di Domizio, L. Di Noto, M. Doser, A. Dudarev, R. Ferragut, A. Fontana, P. Genova, M. Giammarchi, S. N. Gninenko, S. Haider, H. Holmestad, T. Huse, E. Jordan, T. Kaltenbacher, A. Kellerbauer, A. Knecht, D. Krasnicky, V. Lagomarsino, S. Lehner, A. Magnani, C. Malbrunot, S. Mariazzi, V. A. Matveev, F. Moia, C. Nellist, G. Nebbia, P. Nedelec, M. Oberthaler, N. Pacifico, V. Petracek, F. Prelz, M. Prevedelli, C. Riccardi, O. Rohne, A. Rotondi, H. Sandaker, M. A. Subieta Vasquez, M. Spacek, G. Testera, E. Widmann, P. Yzombard, S. Zavatarelli, J. Zmeskal, Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and AEGIS
Subjects: Nuclear and High Energy Physics, Silicon, Physics::Instrumentation and Detectors, Annihilation, antiproton, Silicon pixel sensor, chemistry.chemical_element, Annihilation, Gravitational acceleration, 7. Clean energy, Silicon pixel sensor, Nuclear physics, Optics, Gravitational field, antiproton, Nuclear Energy and Engineering, Electrical and Electronic Engineering, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Antihydrogen, Physics, CMOS sensor, business.industry, Detector, GRAVITATION, chemistry, Antiproton, Antimatter, High Energy Physics::Experiment, business, PARTICLE DETECTORS
Abstract: International audience; The principal aim of the AEgIS experiment at CERN is to measure the acceleration of antihydrogen due to Earth's gravitational field. This would be a test of the Weak Equivalence Principle, which states that all bodies fall with the same acceleration independently of their mass and composition. The effect of Earth's gravitational field on antimatter will be determined by measuring the deflection of the path of the antihydrogen from a straight line. The position of the antihydrogen will be found by detecting its annihilation on the surface of a silicon detector. The gravitational measurement in AEgIS will be performed with a gravity module, which includes the silicon detector, an emulsion detector and a scintillating fibre time-of-flight detector. As the experiment attempts to determine the gravitational acceleration with a precision of 1%, a position resolution better than 10 μm is required. Here we present the results of a study of antiproton annihilations in a 3D silicon pixel sensor and compare the results with a previous study using a monolithic active pixel sensor. This work is part of a larger study on different silicon sensor technologies needed for the development of a silicon position detector for the AEgIS experiment. The 3D detector together with its readout electronics have been originally designed for the ATLAS detector at the LHC. The direct annihilation of low energy antiprotons ( ~ 100 keV) takes place in the first few μm of the silicon sensor and we show that the charged products of the annihilation can be detected with the same sensor. The present study also aims to understand the signature of an antiproton annihilation event in segmented silicon detectors and compares it with a GEANT4 simulation model. These results will be used to determine the geometrical and process parameters to be adopted by the silicon annihilation detector to be installed in AEgIS.
Published: 2014

43. Probing antimatter gravity – The AEGIS experiment at CERN

Author: Giovanni Consolati, G. Nebbia, Germano Bonomi, Tomoko Ariga, M. Spacek, Antonio Ereditato, Sebastiano Mariazzi, L. Smestad, Romualdo Santoro, L. Cabaret, Z. Mazzotta, Rafael Ferragut, Sandra Zavatarelli, T. Huse, Alban Kellerbauer, M. Oberthaler, Angela Gligorova, Sebastian Lehner, Patrick Nedelec, Johann Zmeskal, P. Lebrun, F. Prelz, C. Pistillo, T. Koettig, J. Liberadzka, Paola Scampoli, L. Ravelli, James William Storey, Ruggero Caravita, M. Kimura, H. Holmestad, V. A. Matveev, Claude Amsler, Marco Giammarchi, Davide Pagano, Felice Sorrentino, P. Lansonneur, Adriano Fontana, P. Yzombard, G. Testera, Daniel Comparat, I. M. Strojek, M. Sacerdoti, Fabrizio Castelli, D. Krasnický, S. Haider, Nicola Zurlo, A. Demetrio, Michael Doser, Marco Prevedelli, C. Evans, I. C. Tietje, Massimo Caccia, K. Chlouba, N. Pacifico, Stefano Aghion, Giovanni Cerchiari, Luca Penasa, Eberhard Widmann, Sebastian Gerber, P. Bräunig, V. Lagomarsino, F. Guatieri, B. Rienäcker, Roberto S. Brusa, Chloé Malbrunot, V. Petracek, Simone Cialdi, E. Jordan, L. Di Noto, J. Fesel, Akitaka Ariga, J. Bremer, Alexey Dudarev, Alberto Rotondi, Heidi Sandaker, Ole Røhne, Laboratoire Aimé Cotton (LAC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), AEGIS, Bravina, L., Foka Y., Kabana S., Kellerbauer, A., Aghion, S., Amsler, C., Ariga, A., Ariga, T., Bonomi, G., Bräunig, P., Bremer, J., Brusa, R. S., Cabaret, L., Caccia, M., Caravita, R., Castelli, F., Cerchiari, G., Chlouba, K., Cialdi, S., Comparat, D., Consolati, G., Demetrio, A., Di Noto, L., Doser, M., Dudarev, A., Ereditato, A., Evans, C., Ferragut, R., Fesel, J., Fontana, A., Gerber, S., Giammarchi, M., Gligorova, A., Guatieri, F., Haider, S., Holmestad, H., Huse, T., Jordan, E., Kimura, M., Koettig, T., Krasnický, D., Lagomarsino, V., Lansonneur, P., Lebrun, P., Lehner, S., Liberadzka, J., Malbrunot, C., Mariazzi, S., Matveev, V., Mazzotta, Z., Nebbia, G., Nédélec, P., Oberthaler, M., Pacifico, N., Pagano, D., Penasa, L., Petráček, V., Pistillo, C., Prelz, F., Prevedelli, M., Ravelli, L., Rienäcker, B., Røhne, O.M., Rotondi, A., Sacerdoti, M., Sandaker, H., Santoro, R., Scampoli, P., Smestad, L., Sorrentino, F., Špaček, M., Storey, J., Strojek, I.M., Testera, G., Tietje, I., Widmann, E., Yzombard, P., Zavatarelli, S., Zmeskal, J., Zurlo, N., Røhne, O. M., and Strojek, I. M.
Subjects: Physics, Atom interferometer, Particle physics, Physics::General Physics, 010308 nuclear & particles physics, General Relativity and Cosmology, QC1-999, 01 natural sciences, Antiproton Decelerator, Nuclear physics, Physics and Astronomy (all), Physics and Astronomy. Antimatter. Antiprotons. Gravitational acceleration, Gravitational field, Deflection (physics), Antiproton, Antimatter, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Atomic Physics, Equivalence principle, gravity, antimatter, 010306 general physics, Antihydrogen
Abstract: International audience; The weak equivalence principle states that the motion of a body in a gravitational field is independent of its structure or composition. This postulate of general relativity has been tested to very high precision with ordinary matter, but no relevant experimental verification with antimatter has ever been carried out. The AEGIS experiment will measure the gravitational acceleration of antihydrogen to ultimately 1% precision. For this purpose, a pulsed horizontal antihydrogen beam with a velocity of several 100 m s−1 will be produced. Its vertical deflection due to gravity will be detected by a setup consisting of material gratings coupled with a position-sensitive detector, operating as a moiré deflectometer or an atom interferometer. The AEGIS experiment is installed at CERN’s Antiproton Decelerator, currently the only facility in the world which produces copious amounts of low-energy antiprotons. The construction of the setup has been going on since 2010 and is nearing completion. A proof-of-principle experiment with antiprotons has demonstrated that the deflection of antiparticles by a few μm due to an external force can be detected. Technological and scientific development pertaining to specific challenges of the experiment, such as antihydrogen formation by positronium charge exchange or the position-sensitive detection of antihydrogen annihilations, is ongoing.
Published: 2016

44. Positron manipulation and positronium laser excitation in AEgIS

Author: Daniel Comparat, Sandra Zavatarelli, Marco Giammarchi, Laura Resch, Giovanni Consolati, Giovanni Cerchiari, Germano Bonomi, M. Sacerdoti, F. Sorrentino, M. Spacek, G. Nebbia, Angela Gligorova, P. Lebrun, Marco Prevedelli, M. Kimura, H. Holmestad, P. Lansonneur, S. Haider, Heidi Sandaker, I. C. Tietje, Paola Scampoli, F. Prelz, James William Storey, T. Kaltenbacher, G. Testera, Tomoko Ariga, N. Pacifico, A. Demetrio, Stefan Rosenberger, Viktor Matveev, C. Evans, Romualdo Santoro, L. Ravelli, Markus K. Oberthaler, Karl Chlouba, Luca Penasa, Fabrizio Castelli, Davide Pagano, Simone Cialdi, Claude Amsler, Michael Doser, E. Jordan, Daniel Krasnicky, Alberto Rotondi, C. Pistillo, Ruggero Caravita, Ola Kenji Forslund, Sebastiano Mariazzi, Patrick Nedelec, Lea Di Noto, Adriano Fontana, P. Yzombard, Johann Zmeskal, Sebastian Gerber, L. Cabaret, T. Huse, J. Liberadzka, F. Guatieri, B. Rienäcker, Roberto S. Brusa, S. Vamosi, V. Petracek, Sebastian Lehner, Izabela M Strojek, Antonio Ereditato, Alexey Dudarev, J. Fesel, S. Gninenko, Z. Mazzotta, Alban Kellerbauer, Chloé Malbrunot, Lisa Marx, Ole Røhne, Rafael Ferragut, Ine L Jernelv, Akitaka Ariga, P. Bräunig, J. Bremer, Stefano Aghion, Eberhard Widmann, V. Lagomarsino, Torsten Koetting, Massimo Caccia, Mariazzi, S., Caravita, R., Aghion, S., Amsler, C., Ariga, A., Ariga, T., Bonomi, G., Braunig, P., Bremer, J., Brusa, R. S., Cabaret, L., Caccia, M., Castelli, F., Cerchiari, G., Chlouba, K., Cialdi, S., Comparat, D., Consolati, G., Demetrio, A., Di Noto, L., Doser, M., Dudarev, A., Ereditato, A., Evans, C., Ferragut, R., Fesel, J., Fontana, A., Forslund, O. K., Gerber, S., Giammarchi, M., Gligorova, A., Gninenko, S., Guatieri, F., Haider, S., Holmestad, H., Huse, T., Jernelv, I. L., Jordan, E., Kaltenbacher, T., Kellerbauer, A., Kimura, M., Koetting, T., Krasnicky, D., Lagomarsino, V., Lansonneur, P., Lebrun, P., Lehner, S., Liberadzka, J., Malbrunot, C., Marx, L., Matveev, V., Mazzotta, Z., Nebbia, G., Nedelec, P., Oberthaler, M., Pacifico, N., Pagano, D., Penasa, L., Petracek, V., Pistillo, C., Prelz, F., Prevedelli, M., Ravelli, L., Resch, L., Rienacker, B., Rohne, O. M., Rosenberger, S., Rotondi, A., Sacerdoti, M., Sandaker, H., Santoro, R., Scampoli, P., Sorrentino, F., Spacek, M., Storey, J., Strojek, I. M., Testera, G., Tietje, I., Vamosi, S., Widmann, E., Yzombard, P., Zavatarelli, S., and Zmeskal, J.
Subjects: Positron, Positronium, Radiation, Materials Science (all), Condensed Matter Physics, 01 natural sciences, 010305 fluids & plasmas, law.invention, symbols.namesake, law, 0103 physical sciences, Physics::Atomic and Molecular Clusters, General Materials Science, Physics::Atomic Physics, 010306 general physics, Antihydrogen, Physics, Laser, Excited state, Antimatter, Rydberg formula, symbols, Atomic physics, Excitation
Abstract: Production of antihydrogen by using the charge exchange reaction, as proposed by AEgIS (Antimatter Experiment: gravity, Interferometry, Spectroscopy), requires the formation of a dense cloud of positronium atoms excited to Rydberg states. In this work, the recent advances in AEgIS towards this result are described. Namely, the manipulation of positrons to produce bunches containing more than 108 particles and the laser excitation of positronium to Rydberg states, using n=3 as intermediate level, are presented.
Published: 2016

45. Direct detection of antiprotons with the Timepix3 in a new electrostatic selection beamline

Author: K. Chlouba, N. Pacifico, Chloé Malbrunot, Daniel Comparat, Luca Penasa, Nicola Zurlo, L. Di Noto, M. Kimura, Ole Røhne, P. Lansonneur, G. Nebbia, D. Krasnický, L. Smestad, A. Demetrio, Giovanni Consolati, Germano Bonomi, Sebastiano Mariazzi, Stefano Aghion, C. Evans, Massimo Caccia, Lukas Tlustos, M. Campbell, M. Spacek, J. Alozy, Giovanni Cerchiari, P. Bräunig, Roberto S. Brusa, V. Petracek, J. Bremer, Adriano Fontana, Gerard Lawler, M. Oberthaler, Angela Gligorova, Eberhard Widmann, P. Yzombard, Sandra Zavatarelli, L. Cabaret, T. Huse, V. Lagomarsino, Akitaka Ariga, P. Lebrun, M. Sacerdoti, Alexey Dudarev, Romualdo Santoro, Marco Prevedelli, Marco Giammarchi, X. Llopart, J. Fesel, Rafael Ferragut, I. C. Tietje, Paola Scampoli, James William Storey, Z. Mazzotta, Antonio Ereditato, Patrick Nedelec, Alban Kellerbauer, Claude Amsler, L. Resch, Johann Zmeskal, L. Marx, Felice Sorrentino, S. Haider, F. Prelz, Sebastian Gerber, C. Pistillo, F. Guatieri, H. Holmestad, Ruggero Caravita, Tomoko Ariga, V. A. Matveev, L. Ravelli, Davide Pagano, G. Testera, I. M. Strojek, Fabrizio Castelli, Simone Cialdi, E. Jordan, Michael Doser, Heidi Sandaker, Alberto Rotondi, Laboratoire Aimé Cotton (LAC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Pacifico, N, Aghion, S., Alozy, J., Amsler, C., Ariga, A., Ariga, T., Bonomi, G., Bräunig, P., Bremer, J., Brusa, R.S., Cabaret, L., Caccia, M., Campbell, M., Caravita, R., Castelli, F., Cerchiari, G., Chlouba, K., Cialdi, S., Comparat, D., Consolati, G., Demetrio, A., Di Noto, L., Doser, M., Dudarev, A., Ereditato, A., Evans, C., Ferragut, R., Fesel, J., Fontana, A., Gerber, S., Giammarchi, M., Gligorova, A., Guatieri, F., Haider, S., Holmestad, H., Huse, T., Jordan, E., Kellerbauer, A., Kimura, M., Krasnický, D., Lagomarsino, V., Lansonneur, P., Lawler, G., Lebrun, P., Llopart, X., Malbrunot, C., Mariazzi, S., Marx, L., Matveev, V., Mazzotta, Z., Nebbia, G., Nedelec, P., Oberthaler, M., Pagano, D., Penasa, L., Petracek, V., Pistillo, C., Prelz, F., Prevedelli, M., Ravelli, L., Resch, L., Røhne, O.M., Rotondi, A., Sacerdoti, M., Sandaker, H., Santoro, R., Scampoli, P., Smestad, L., Sorrentino, F., Spacek, M., Storey, J., Strojek, I.M., Testera, G., Tietje, I., Tlustos, L., Widmann, E., Yzombard, P., Zavatarelli, S., Zmeskal, J., Zurlo, N., Brusa, R. S., Røhne, O. M., Scampoli, Paola, and Strojek, I. M.
Subjects: Antimatter, Silicon, Nuclear and High Energy Physics, AEgIS, Antiprotons, Detector, Timepix, Antiproton, 01 natural sciences, Nuclear physics, Instrumentation, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Physics, Large Hadron Collider, Annihilation, 010308 nuclear & particles physics, Antiproton Decelerator, Time of flight, Beamline, High Energy Physics::Experiment
Abstract: see paper for full list of authors; International audience; We present here the first results obtained employing the Timepix3 for the detection and tagging of annihilations of low energy antiprotons. The Timepix3 is a recently developed hybrid pixel detector with advanced Time-of-Arrival and Time-over-Threshold capabilities and has the potential of allowing precise kinetic energy measurements of low energy charged particles from their time of flight. The tagging of the characteristic antiproton annihilation signature, already studied by our group, is enabled by the high spatial and energy resolution of this detector. In this study we have used a new, dedicated, energy selection beamline (GRACE). The line is symbiotic to the AEgIS experiment at the CERN Antiproton Decelerator and is dedicated to detector tests and possibly antiproton physics experiments. We show how the high resolution of the Timepix3 on the Time-of-Arrival and Time-over-Threshold information allows for a precise 3D reconstruction of the annihilation prongs. The presented results point at the potential use of the Timepix3 in antimatter-research experiments where a precise and unambiguous tagging of antiproton annihilations is required.
Published: 2016

46. Off-axial plasma displacement suitable for antihydrogen production in AEgIS experiment

Author: Carlo Canali, V. Lagomarsino, L. Di Noto, C. Carraro, D. Krasnicky, Sandra Zavatarelli, and G. Testera
Subjects: Physics, Positron, Physics::Plasma Physics, Antiproton, Physics::Atomic Physics, Plasma, Electron, Atomic physics, Penning trap, Antihydrogen, Atomic and Molecular Physics, and Optics, Excitation, Magnetic field
Abstract: Antihydrogen experiments are currently based on non neutral electron, positron or antiproton plasma manipulation techniques in cylindrical Malmberg-Penning traps. An experimental study of a plasma manipulation technique based on off-axis diocotron displacement is presented. The use of the autoresonant excitation of (1, 0) diocotron mode of pure electron plasma allows a precise positioning of the plasma by moving it across the magnetic field and allows dumping such plasma in a desired angular position. The experimental procedure described here will pave the way to positron loading into an off-axial Penning trap terminated with a positronium converter target as it is proposed for the AEgIS experimental apparatus. The technique was studied over a range of confining magnetic field values and reproduces experimental conditions similar to most of the currently running antihydrogen experiments. The efficiency of the autoresonant excitation – in terms of plasma expansion rate and particle loss – is analyzed, studying the behaviour of electron plasma subjected to large off-axial displacements, showing that this method fulfills the requirements imposed by the AEgIS experiment.
Published: 2011

47. Particle manipulation techniques in AEgIS

Author: Carlo Canali, C. Carraro, V. Lagomarsino, Sandra Zavatarelli, D. Krasnicky, L. Di Noto, and G. Testera
Subjects: Physics, Nuclear and High Energy Physics, Large Hadron Collider, Annihilation, Astrophysics::Cosmology and Extragalactic Astrophysics, Electron, Condensed Matter Physics, Gravitational acceleration, Atomic and Molecular Physics, and Optics, Nuclear physics, Interferometry, Positron, Antimatter, Physical and Theoretical Chemistry, Antihydrogen
Abstract: The AEgIS experiment (http://aegis.web.cern.ch) will measure the gravitational acceleration g of antihydrogen. Once performed this could be the first direct test of the gravitational interaction between matter and antimatter. In the AEgIS experiment a beam of antihydrogen will travel horizontally along a path of about 1 m trough a moire deflectometer followed by a position sensitive detector. The g value will be obtained measuring the vertical displacement of the annihilation patterns. Before producing the beam, several tasks have to be performed mainly involving positron and electron plasma manipulation and particles cooling in Malmberg-Penning traps. The AEgIS experiment is currently under construction at CERN, meanwhile several tests involving particle manipulation and particle cooling are in progress. In this report some experimental results involving diocotron manipulation of plasma will be presented.
Published: 2011

48. Antihydrogen physics: gravitation and spectroscopy in AEgISThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at École de Physique, les Houches, France, 30 May – 4 June, 2010

Author: A. Fischer, L. Cabaret, Patrick Nedelec, Alfredo Dupasquier, F. Prelz, Daniel Comparat, S. D. Hogan, Alban Kellerbauer, Nikolay Djourelov, Alberto Rotondi, D. S. Zvezhinskij, Fabio Villa, G. Nebbia, Victor Matveev, L. V. Jørgensen, Sergey V. Stepanov, Adriano Fontana, I.Y. Al-Qaradawi, L. Dassa, C. Carraro, D. Perini, Davide Trezzi, G. Drobychev, R. Heyne, D. Krasnicky, Roberto S. Brusa, Alexey Dudarev, Ilario Boscolo, V. Petracek, D. Sillou, Sebastiano Mariazzi, Marco Giammarchi, Giovanni Consolati, Gabriele Ferrari, M. Oberthaler, Simone Cialdi, Germano Bonomi, Sergei Gninenko, U. Warring, Rafael Ferragut, Aldo Zenoni, M. Sacerdoti, P. Folegati, Marco Prevedelli, A. S. Belov, Ole Røhne, L. Formaro, Heidi Sandaker, Carlo Canali, G. Testera, Cristina Riccardi, C. Morhard, Fabrizio Castelli, Michael Doser, Fiorenza Quasso, Alberto Calloni, A. V. Turbabin, Sandra Zavatarelli, G. Manuzio, R. Vaccarone, V. Lagomarsino, Vsevolod M. Byakov, and H. H. Stroke
Subjects: Physics, 010308 nuclear & particles physics, General Physics and Astronomy, 7. Clean energy, 01 natural sciences, Positronium, Gravitation, Nuclear physics, symbols.namesake, Stark effect, Antiproton, Antimatter, Excited state, 0103 physical sciences, Physics::Atomic and Molecular Clusters, symbols, Physics::Atomic Physics, Rydberg state, 010306 general physics, Antihydrogen
Abstract: AEgIS (Antimatter experiment: gravity, interferometry, spectroscopy) is an experiment approved by CERN with the goal of studying antihydrogen physics. In AEgIS, antihydrogen will be produced by charge exchange reactions of cold antiprotons with positronium atoms excited in a Rydberg state (n > 20). In the first phase of the experiment, controlled acceleration by an electric field gradient (Stark effect) and subsequent measurement of free fall in a Moiré deflectometer will allow a test of the weak equivalence principle. In a second phase, the antihydrogen will be slowed, confined, and laser-cooled to perform CPT studies and detailed spectroscopy. In the present work, after a general description of the experiment, the present status of advancement will be reviewed, with special attention to the production and excitation of positronium atoms.
Published: 2011

49. Development of nuclear emulsions operating in vacuum for the AEgIS experiment

Author: Akitaka Ariga, A. Knecht, Sandra Zavatarelli, L. V. Jørgensen, V. Lagomarsino, E. Wildmann, A. Fontana, R. S. Brusa, Sebastiano Mariazzi, Sergei Gninenko, J. Bremere, Marco Giammarchi, Giovanni Cerchiari, Paola Scampoli, James William Storey, M. A. Subieta Vasquez, Jiro Kawada, Alban Kellerbauer, Cristina Riccardi, Claude Amsler, L. Noto, Tomoko Ariga, Alberto Rotondi, M. Kimura, S. Domizio, Ole Røhne, T. Kaltenbacher, L. Cabaret, Heidi Sandaker, T. Huse, Giovanni Consolati, Stefano Aghion, D. Krasnický, A. Gligorova, A. Dudarev, P. Genova, Rafael Ferragut, Massimo Caccia, Germano Bonomi, S. Haider, C. Regenfus, P. Bräunig, M. Špaček, N. Pacifico, V. Petráček, Carlo Canali, G. Testera, Karl Berggren, Fabrizio Castelli, O. Ahlén, Michael Doser, F. Prelz, Daniel Comparat, Chloé Malbrunot, Simone Cialdi, E. Jordan, A. S. Belov, Sebastian Lehner, F. Moia, Marco Prevedelli, Patrick Nedelec, Johann Zmeskal, H. Derking, Antonio Ereditato, Markus K. Oberthaler, C. Pistillo, Ruggero Caravita, V. A. Matveev, G. Nebbia, Laboratoire Aimé Cotton (LAC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), AEGIS, Scampoli, Paola, S., Aghion, O., Ahl?n, C., Amsler, A., Ariga, T., Ariga, A. S., Belov, K., Berggren, G., Bonomi, P., Br?unig, J., Bremer, R. S., Brusa, L., Cabaret, M., Caccia, C., Canali, R., Caravita, F., Castelli, G., Cerchiari, S., Cialdi, D., Comparat, G., Consolati, H., Derking, S., Di Domizio, L., Di Noto, M., Doser, A., Dudarev, A., Ereditato, R., Ferragut, A., Fontana, P., Genova, M., Giammarchi, A., Gligorova, S. N., Gninenko, S., Haider, T., Huse, E., Jordan, L. V., J?rgensen, T., Kaltenbacher, J., Kawada, A., Kellerbauer, M., Kimura, A., Knecht, D., Krasnick?, V., Lagomarsino, S., Lehner, C., Malbrunot, S., Mariazzi, V. A., Matveev, F., Moia, G., Nebbia, P., N?d?lec, M. K., Oberthaler, N., Pacifico, V., Petr??ek, C., Pistillo, F., Prelz, M., Prevedelli, C., Regenfu, C., Riccardi, O., R?hne, A., Rotondi, H., Sandaker, J., Storey, M. A., Subieta Vasquez, M., ?pa?ek, G., Testera, E., Wildmann, S., Zavatarelli, J., Zmeskal, and AEgIS Collaboration
Subjects: Particle tracking detectors, Particle identification methods, Gravitational acceleration, 01 natural sciences, Nuclear physics, Particle identification methods, Particle tracking detectors, 0103 physical sciences, Vertical direction, Nuclear emulsion, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Aerospace engineering, Equivalence principle, Detectors and Experimental Techniques, 010306 general physics, Antihydrogen, Instrumentation, GeneralLiterature_REFERENCE(e.g.,dictionaries,encyclopedias,glossaries), Mathematical Physics, ComputingMilieux_MISCELLANEOUS, Physics, 010308 nuclear & particles physics, business.industry, Detector, Particle tracking detector, Interferometry, Antimatter, business
Abstract: For the first time the AEgIS (Antihydrogen Experiment: Gravity, Interferometry, Spectroscopy) experiment will measure the Earth's local gravitational acceleration g on antimatter through the evaluation of the vertical displacement of an antihydrogen horizontal beam. This will be a model independent test of the Weak Equivalence Principle at the base of the general relativity. The initial goal of a g measurement with a relative uncertainty of 1% will be achieved with less than 1000 detected antihydrogens, provided that their vertical position could be determined with a precision of a few micrometers. An emulsion based detector is very suitable for this purpose featuring an intrinsic sub-micrometric spatial resolution. Nevertheless, the AEgIS experiment requires unprecedented operational conditions for this type of detector, namely vacuum environment and very low temperature. An intense R&D; activity is presently going on to optimize the detector for the AEgIS experimental requirements with rather encouraging results.
Published: 2013

50. Positron bunching and electrostatic transport system for the production and emission of dense positronium clouds into vacuum

Author: C. Pistillo, M. Sacerdoti, Ruggero Caravita, Marco Prevedelli, I. C. Tietje, L. Cabaret, Ola Kenji Forslund, T. Huse, S. Rosenberger, Patrick Nedelec, V. A. Matveev, Adriano Fontana, Giovanni Cerchiari, Johann Zmeskal, Sandra Zavatarelli, J. Liberadzka, Simone Cialdi, E. Jordan, Marco Giammarchi, G. Nebbia, Fiodor Sorrentino, Akitaka Ariga, Daniel Comparat, M. Kimura, N. Pacifico, Z. Mazzotta, G. Testera, Giovanni Consolati, A. S. Belov, Germano Bonomi, Romualdo Santoro, Luca Penasa, D. Krasnicky, I. L. Jernelv, T. Kaltenbacher, M. Spacek, Alban Kellerbauer, A. Demetrio, Sebastiano Mariazzi, Fabrizio Castelli, Chloé Malbrunot, Heidi Sandaker, P. Lansonneur, Ole Røhne, C. Evans, Michael Doser, S. N. Gninenko, J. Fesel, M. Oberthaler, L. Marx, Angela Gligorova, H. Holmestad, Paola Scampoli, James William Storey, P. Bräunig, F. Prelz, P. Yzombard, Alberto Rotondi, Claude Amsler, T. Koetting, B. Rienäcker, Sebastian Gerber, Roberto S. Brusa, S. Vamosi, J. Bremer, V. Petracek, Antonio Ereditato, K. Chlouba, F. Guatieri, Sebastian Lehner, Alexey Dudarev, Stefano Aghion, S. Haider, P. Lebrun, Eberhard Widmann, V. Lagomarsino, L. Di Noto, L. Ravelli, Davide Pagano, Tomoko Ariga, I. M. Strojek, Massimo Caccia, Aghion, S., Amsler, C., Ariga, A., Ariga, T., Belov, A. S., Bonomi, G., Bräunig, P., Bremer, J., Brusa, R. S., Cabaret, L., Caccia, M., Caravita, R., Castelli, F., Cerchiari, G., Chlouba, K., Cialdi, S., Comparat, D., Consolati, G., Demetrio, A., Di Noto, L., Doser, M., Dudarev, A., Ereditato, A., Evans, C., Fesel, J., Fontana, A., Forslund, O. K., Gerber, S., Giammarchi, M., Gligorova, A., Gninenko, S., Guatieri, F., Haider, S., Holmestad, H., Huse, T., Jernelv, I. L., Jordan, E., Kaltenbacher, T., Kellerbauer, A., Kimura, M., Koetting, T., Krasnicky, D., Lagomarsino, V., Lebrun, P., Lansonneur, P., Lehner, S., Liberadzka, J., Malbrunot, C., Mariazzi, S., Marx, L., Matveev, V., Mazzotta, Z., Nebbia, G., Nedelec, P., Oberthaler, M., Pacifico, N., Pagano, D., Penasa, L., Petracek, V., Pistillo, C., Prelz, F., Prevedelli, M., Ravelli, L., Rienäcker, B., Røhne, O. M., Rosenberger, S., Rotondi, A., Sacerdoti, M., Sandaker, H., Santoro, R., Scampoli, Paola, Sorrentino, F., Spacek, M., Storey, J., Strojek, I. M., Testera, G., Tietje, I., Vamosi, S., Widmann, E., Yzombard, P., Zavatarelli, S., Zmeskal, J., Belov, A.S., Braunig, P., Brusa, R.S., Forslund, O.K., Jernelv, I.L., Rienacker, B., Rohne, O.M., Scampoli, P., Strojek, I.M., Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and AEGIS
Subjects: Physics, Bunching, Positron, Positronium, Instrumentation, Nuclear and High Energy Physics, 530 Physics, Astrophysics::High Energy Astrophysical Phenomena, Porous silicon, Positron, Positronium, Bunching, Magnetic field, Full width at half maximum, Bunches, Physics in General, Physics::Accelerator Physics, High Energy Physics::Experiment, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Positron emission, Atomic physics, Spectroscopy
Abstract: International audience; We describe a system designed to re-bunch positron pulses delivered by an accumulator supplied by a positron source and a Surko-trap. Positron pulses from the accumulator are magnetically guided in a 0.085 T field and are injected into a region free of magnetic fields through a μμ-metal field terminator. Here positrons are temporally compressed, electrostatically guided and accelerated towards a porous silicon target for the production and emission of positronium into vacuum. Positrons are focused in a spot of less than 4 mm FWTM in bunches of ∼8 ns FWHM. Emission of positronium into the vacuum is shown by single shot positron annihilation lifetime spectroscopy.
Published: 2015

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