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1. Toward a pulsed antihydrogen beam for WEP tests in AEgIS

Author

Saiva Huck, Marcis Auzins, Benedikt Bergmann, Petr Burian, Roberto S. Brusa, Antoine Camper, Ruggero Caravita, Fabrizio Castelli, Roman Ciuryło, Giovanni Consolati, Michael Doser, Aaron Farricker, Lisa T. Glöggler, Łukasz Graczykowski, Malgorzata Grosbart, Francesco Guatieri, Natali Gusakova, Stefan Haider, Malgorzata Janik, Grzegorz Kasprowicz, Ghanshyambhai Khatri, Łukasz Kłosowski, Georgy Kornakov, Valts Krumins, Lidia Lappo, Adam Linek, Chloé Malbrunot, Sebastiano Mariazzi, Lilian Nowak, Dorota Nowicka, Emmanuel Oswald, Luca Penasa, Vojtech Petracek, Mariusz Piwiński, Stanislav Pospisil, Luca Povolo, Francesco Prelz, Sadiq Rangwala, Benjamin Rienäcker, Volodymyr Rodin, Ole M. Røhne, Heidi Sandaker, Petr Smolyanskiy, Tomasz Sowiński, Dariusz Tefelski, Marco Volponi, Carsten Welsch, Tim Wolz, Michal Zawada, Jakub Zielinski, Christian Zimmer, and Nicola Zurlo

Subjects
antihydrogen, General Medicine
Abstract

The AEg̅IS collaboration at CERN’s AD produces antihydrogen atoms in the form of a pulsed, isotropic source with a precisely defined formation time. AEg̅IS has recently undergone major upgrades to fully benefit from the increased number of colder antiprotons provided by the new ELENA decelerator and to move toward forming a horizontal beam to directly investigate the influence of gravity on the H̅ atoms, thereby probing the Weak Equivalence Principle for antimatter. This contribution gives an overview of these upgrades as well as subsequent results from the first beam times with ELENA.

Published
2023

2. 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
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3. 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
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4. 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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5. 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
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6. 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
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7. 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
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8. 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

9. 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
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10. 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
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11. 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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12. 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
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13. 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
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14. 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
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15. 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
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16. 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
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17. 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
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18. Overview of Recent Work on Laser Excitation of Positronium for the Formation of Antihydrogen

Author

J. Fesel, P. Yzombard, Z. Mazzotta, Giovanni Cerchiari, Alban Kellerbauer, Romualdo Santoro, G. Nebbia, Matveev, P. Bräunig, Alberto Rotondi, Andrea Fontana, Antonio Ereditato, Lagomarsino, Sebastiano Mariazzi, Giovanni Consolati, Germano Bonomi, Ole Røhne, L. Ravelli, Ph. Lebrun, H. Holmestad, Massimo Caccia, M. Sacerdoti, Lillian Smestad, D. Krasnický, A. Demetrio, L. Cabaret, Marco Prevedelli, Davide Pagano, Marco Giammarchi, C. Evans, Heidi Sandaker, Felice Sorrentino, I. C. Tietje, T. Huse, M. Oberthaler, I. M. Strojek, G. Testera, Angela Gligorova, S. Haider, Petracek, L. Di Noto, Patrick Nedelec, Nicola Zurlo, Fabrizio Castelli, Johann Zmeskal, Tomoko Ariga, Michael Doser, Rafael Ferragut, S. Vamosi, Paola Scampoli, Claude Amsler, Luca Penasa, Nicola Pacifico, Chloé Malbrunot, Sebastian Gerber, F. Guatieri, P. Lansonneur, Daniel Comparat, F. Prelz, B. Rienaecker, C. Pistillo, Ruggero Caravita, R. S. Brusa, E. Widmann, 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), Yasuyuki Matsuda, Yzombard, P., Amsler, C., 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., 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, Marco, Ravelli, L., Rienaecker, B., Røne, O. M., Rotondi, A., Sacerdoti, M., Sandaker, H., Santoro, R., Scampoli, P., Smestad, L., Sorrentino, F., Strojek, I. M., Testera, G., Tietje, I. C., Vamosi, S., Widmann, E., Zmeskal, J., Zurlo, N., 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
Work (thermodynamics), CERN Lab, antihydrogen: beam, Positronium laser cooling, Positronium, 7. Clean energy, 01 natural sciences, 010305 fluids & plasmas, law.invention, laser excitation, Nuclear physics, antihydrogen: formation, Physics in General, law, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Positronium laser excitation, Physics::Atomic Physics, anti-matter, laser excitation, positronium: excited state, 010306 general physics, Antihydrogen, Physics, Positronium, Antihydrogen, Laser-matter interaction, Positronium laser excitation, Positronium laser cooling, anions laser cooling, Condensed Matter::Quantum Gases, anions laser cooling, atom, antihydrogen: production, Laser, charge exchange, [PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph], anti-p, laser, Laser-matter interaction, anti-matter, gravitation, Physics::Accelerator Physics, Excitation
Abstract

International audience; The AEgIS experiment carried out at CERN aims to form a cold antihydrogen beam to perform precision studies on gravity. A key ingredient is the creation of antihydrogen via a charge-exchange process between trapped antiprotons and Rydberg excited positronium atoms (Ps). In the present, the latest results of laser excitation of Ps are reviewed, as well as studies on a possible laser manipulation and cooling of Ps and antiprotons.

Published
2017
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19. 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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20. 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
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21. 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
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22. 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

23. The AEgIS experiment

Author

Sebastiano Mariazzi, A. S. Belov, Marco Prevedelli, Marco Giammarchi, Z. Mazzotta, S. N. Gninenko, J. Bremer, Alban Kellerbauer, Rafael Ferragut, F. Prelz, L. Cabaret, Giovanni Cerchiari, Sebastian Gerber, Chloé Malbrunot, Simone Cialdi, Ole Røhne, E. Jordan, C. Pistillo, M. Kimura, T. Huse, Ruggero Caravita, N. Pacifico, D. Krasnický, Daniel Comparat, Alexey Dudarev, S. Rosenberger, Luca Penasa, A. Demetrio, Jiro Kawada, Akitaka Ariga, Alberto Rotondi, L. Di Noto, V. A. Matveev, S. D. Hogan, K. Chlouba, Sandra Zavatarelli, L. Semeria, Heidi Sandaker, Sebastian Lehner, Romualdo Santoro, Roberto S. Brusa, Paola Scampoli, Eberhard Widmann, James William Storey, V. Petracek, V. Lagomarsino, Claude Amsler, Stefano Aghion, M. Subieta, P. Bräunig, Massimo Caccia, Adriano Fontana, Tomoko Ariga, Cristina Riccardi, Giovanni Consolati, Germano Bonomi, M. Spacek, S. Curreli, S. Haider, Patrick Nedelec, Johann Zmeskal, H. Derking, G. Testera, Antonio Ereditato, M. Oberthaler, Angela Gligorova, Fabrizio Castelli, P. Yzombard, Michael Doser, M. C. Simon, L. Ravelli, H. Holmestad, I. M. Strojek, 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, Testera, G., Aghion, S., Amsler, C., Ariga, A., Ariga, T., Belov, A., Bonomi, G., Braunig, P., Bremer, J., Brusa, R., Cabaret, L., Caccia, M., Caravita, R., Castelli, F., Cerchiari, G., Chlouba, K., Cialdi, S., Comparat, D., Consolati, G., Curreli, S., Demetrio, A., Derking, H., Noto, L. Di, Doser, M., Dudarev, A., Ereditato, A., Ferragut, R., Fontana, A., Gerber, S., Giammarchi, M., Gligorova, A., Gninenko, S., Haider, S., Hogan, S., Holmestad, H., Huse, T., Jordan, E. J., Kawada, J., Kellerbauer, A., Kimura, M., Krasnický, D., Lagomarsino, V., Lehner, S., Malbrunot, C., Mariazzi, S., Matveev, V., Mazzotta, Z., Nebbia, G., Nedelec, P., Oberthaler, M., Pacifico, N., Penasa, L., Petracek, V., Pistillo, C., Prelz, F., Prevedelli, M., Ravelli, L., Riccardi, C., Røhne, O. M., Rosenberger, S., Rotondi, A., Sandaker, H., Santoro, R., Scampoli, Paola, Semeria, L., Simon, M., Spacek, M., Storey, J., Strojek, I. M., Subieta, M., Widmann, E., Yzombard, P., Zavatarelli, S., and Zmeskal, J.

Subjects
Physics::General Physics, Nuclear and High Energy Physics, Atomic and Molecular Physics, and Optic, 530 Physics, Electron, Condensed Matter Physic, Gravitational acceleration, 01 natural sciences, Nuclear physics, Atomic and Molecular Physics, 0103 physical sciences, Antihydrogen, Equivalence Principle, Traps, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Physical and Theoretical Chemistry, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Physics::Atomic Physics, Equivalence principle, 010306 general physics, Nuclear and High Energy Physic, Physics, Large Hadron Collider, 010308 nuclear & particles physics, Trap, Antiproton, Antimatter, Physics::Accelerator Physics, and Optics, Beam (structure)
Abstract

see paper for full list of authors; International audience; The AEgIS experiment is presently almost completely installed at CERN. It is currently taking data with antiprotons, electrons and positrons. The apparatus is designed to form a cold, pulsed beam of antihydrogen to measure the Earth’s gravitational acceleration g on antimatter and to perform spectroscopy measurements. This paper describes the main features of the apparatus and shows a selected review of some achieved results.

Published
2015
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24. Testing the Weak Equivalence Principle with an antimatter beam at CERN

Author

L. Ravelli, Patrick Nedelec, Davide Pagano, N. Pacifico, Sebastiano Mariazzi, Jiro Kawada, L. Di Noto, Johann Zmeskal, Luca Penasa, I. M. Strojek, S. Rosenberger, Massimo Caccia, Eberhard Widmann, V. Lagomarsino, Giovanni Consolati, H. Derking, Germano Bonomi, M. Sacerdoti, S. Haider, Romualdo Santoro, M. Subieta, Roberto S. Brusa, Ole Røhne, Paola Scampoli, James William Storey, M. Spacek, V. Petracek, M. Kimura, Marco Prevedelli, Claude Amsler, K. Chlouba, Alberto Rotondi, Tomoko Ariga, F. Prelz, D. Krasnicky, A. Demetrio, Heidi Sandaker, Alexey Dudarev, Giovanni Cerchiari, M. Oberthaler, Daniel Comparat, Adriano Fontana, Angela Gligorova, Chloé Malbrunot, L. Cabaret, P. Yzombard, Marco Giammarchi, Antonio Ereditato, T. Huse, Cristina Riccardi, G. Testera, J. Bremer, Z. Mazzotta, Simone Cialdi, Sandra Zavatarelli, E. Jordan, Felice Sorrentino, Alban Kellerbauer, A. S. Belov, Akitaka Ariga, Fabrizio Castelli, Michael Doser, H. Holmestad, Sebastian Gerber, P. Bräunig, S. N. Gninenko, C. Pistillo, Ruggero Caravita, Stefano Aghion, V. A. Matveev, Sebastian Lehner, Rafael Ferragut, G. Nebbia, Kimura, M, Aghion, S, Amsler, C, Ariga, A, Ariga, T, Belov, A, 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, Derking, H, Noto, L Di, Doser, M, Dudarev, A, Ereditato, A, Ferragut, R, Fontana, A, Gerber, S, Giammarchi, M, Gligorova, A, Gninenko, S, Haider, S, Holmestad, H, Huse, T, Jordan, E J, Kawada, J, Kellerbauer, A, Krasnicky, D, Lagomarsino, V, Lehner, S, 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, Riccardi, C, Røhne, O M, Rosenberger, S, Rotondi, A, Sacerdoti, M, Sandaker, H, Santoro, R, Scampoli, P, Sorrentino, F, Spacek, M, Strojek, I M, Storey, J, Subieta, M, Testera, G, Widmann, E, Yzombard, P, Zavatarelli, S, Zmeskal, J, Kimura, M., Aghion, S., Amsler, C., Ariga, A., Ariga, T., Belov, A., 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., Derking, H., Noto, L. Di, Doser, M., Dudarev, A., Ereditato, A., Ferragut, R., Fontana, A., Gerber, S., Giammarchi, M., Gligorova, A., Gninenko, S., Haider, S., Holmestad, H., Huse, T., Jordan, E. J., Kawada, J., Kellerbauer, A., Krasnicky, D., Lagomarsino, V., Lehner, S., 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., Riccardi, C., Røhne, O. M., Rosenberger, S., Rotondi, A., Sacerdoti, M., Sandaker, H., Santoro, R., Scampoli, Paola, Sorrentino, F., Spacek, M., Strojek, I. M., Storey, J., Subieta, M., Testera, G., Widmann, E., Yzombard, P., Zavatarelli, S., Zmeskal, J., 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
Photographic emulsions, Atoms, History, Particle physics, Physics::General Physics, 530 Physics, Nuclear emulsions, Gravitational acceleration, 7. Clean energy, Education, Nuclear physics, Physics and Astronomy (all), Positron, NUCLEAR-EMULSIONS, Gravitational accelerations, Physics and Astronomy (all), NUCLEAR-EMULSIONS, AEGIS EXPERIMENT, ANTIPROTONS, POSITRONIUM, SYSTEM, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Atomic and Molecular Clusters, Vertical displacements, Nuclear emulsion, Physics::Atomic Physics, particle physics, gravity, Antihydrogen, Gravitational forces, Stark accelerator, Physics, Large Hadron Collider, Emulsification, Tracking (position), Antihydrogen atoms, Fundamental laws, Weak equivalence principle, Detector, Computer Science Applications, Antiproton, Antimatter, Physics::Accelerator Physics, Particle Physics - Experiment
Abstract

International audience; The goal of the AEgIS experiment is to measure the gravitational acceleration of antihydrogen ? the simplest atom consisting entirely of antimatter ? with the ultimate precision of 1%. We plan to verify the Weak Equivalence Principle (WEP), one of the fundamental laws of nature, with an antimatter beam. The experiment consists of a positron accumulator, an antiproton trap and a Stark accelerator in a solenoidal magnetic field to form and accelerate a pulsed beam of antihydrogen atoms towards a free-fall detector. The antihydrogen beam passes through a moir? deflectometer to measure the vertical displacement due to the gravitational force. A position and time sensitive hybrid detector registers the annihilation points of the antihydrogen atoms and their time-of-flight. The detection principle has been successfully tested with antiprotons and a miniature moir? deflectometer coupled to a nuclear emulsion detector.

Published
2015
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25. Emulsion detectors for the antihydrogen detection in AEgIS

Author

G. Testera, Ole Røhne, S. N. Gninenko, Fabrizio Castelli, M. Subieta, Michael Doser, M. C. Simon, C. Pistillo, Paola Scampoli, James William Storey, Claude Amsler, Giovanni Consolati, Ruggero Caravita, Patrick Nedelec, Akitaka Ariga, H. Holmestad, Germano Bonomi, K. Chlouba, Johann Zmeskal, M. Spacek, L. Cabaret, G. Nebbia, T. Huse, Chloé Malbrunot, P. Bräunig, S. Rosenberger, H. Derking, F. Prelz, J. Bremer, Marco Giammarchi, V. A. Matveev, Sebastiano Mariazzi, Alexey Dudarev, Rafael Ferragut, Daniel Comparat, Z. Mazzotta, Alban Kellerbauer, Sebastian Gerber, Stefano Aghion, Simone Cialdi, Sebastian Lehner, S. D. Hogan, E. Jordan, A. S. Belov, S. Haider, N. Pacifico, M. Oberthaler, Luca Penasa, Angela Gligorova, P. Yzombard, Antonio Ereditato, Cristina Riccardi, Tomoko Ariga, L. Ravelli, I. M. Strojek, Massimo Caccia, V. Petráček, Eberhard Widmann, V. Lagomarsino, Jiro Kawada, L. Di Noto, Sandra Zavatarelli, Marco Prevedelli, Romualdo Santoro, M. Kimura, D. Krasnický, A. Demetrio, Heidi Sandaker, Alberto Rotondi, Andrea Fontana, Giovanni Cerchiari, R. S. Brusa, Pistillo, C, Aghion, S., Amsler, C., Ariga, A., Ariga, T., Belov, A., 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., Derking, H., Di Noto, L., Doser, M., Dudarev, A., Ereditato, A., Ferragut, R., Fontana, A., Gerber, S., Giammarchi, M., Gligorova, A., Gninenko, S., Haider, S., Hogan, S., Holmestad, H., Huse, T., Jordan, E. J., Kawada, J., Kellerbauer, A., Kimura, M., Krasnický, D., Lagomarsino, V., Lehner, S., Malbrunot, C., Mariazzi, S., Matveev, V., Mazzotta, Z., Nebbia, G., Nédélec, P., Oberthaler, M., Pacifico, N., Penasa, L., Petráček, V., Prelz, F., Prevedelli, M., Ravelli, L., Riccardi, C., Røhne, O., Rosenberger, S., Rotondi, A., Sandaker, H., Santoro, R., Scampoli, Paola, Simon, M., Špaček, M., Storey, J., Strojek, I. M., Subieta, M., Testera, G., Widmann, E., Yzombard, P., Zavatarelli, S., Zmeskal, J., 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
Nuclear and High Energy Physics, Physics::General Physics, Antimatter, Atomic and Molecular Physics, and Optic, 530 Physics, Physics::Instrumentation and Detectors, Condensed Matter Physic, 01 natural sciences, Nuclear physics, Gravitational field, Atomic and Molecular Physics, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Physical and Theoretical Chemistry, 010306 general physics, Antihydrogen, Nuclear and High Energy Physic, Physics, Large Hadron Collider, 010308 nuclear & particles physics, Emulsion, Detector, Gravitational interaction, Emulsions, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, and Optics, Beam (structure)
Abstract

see paper for full list of authors; International audience; The AEgIS experiment at CERN aims to perform the first direct measurement of gravitational interaction between matter and antimatter by measuring the deviation of a cold antihydrogen beam in the Earth gravitational field. The design of the experiment has been recently updated to include emulsion films as position sensitive detector. The submicrometric position accuracy of emulsions leads indeed to a significant improvement of the experimental sensitivity. We present results of preliminary tests and discuss perspectives for the final measurement.

Published
2015
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26. Particle tracking at cryogenic temperatures: the Fast Annihilation Cryogenic Tracking (FACT) detector for the AEgIS antimatter gravity experiment

Author

Sandra Zavatarelli, Tomoko Ariga, Andrea Fontana, Giovanni Consolati, Marco Prevedelli, Chloé Malbrunot, Germano Bonomi, L. Ravelli, M. Spacek, G. Nebbia, S. N. Gninenko, S. Haider, Sebastiano Mariazzi, Simone Cialdi, J. Bremer, L. Cabaret, I. M. Strojek, T. Huse, E. Jordan, A. S. Belov, Ole Røhne, Sebastian Gerber, M. Kimura, Markus K. Oberthaler, S. D. Hogan, Heidi Sandaker, Rafael Ferragut, P. Scampoli, C. Pistillo, F. Prelz, Marco Giammarchi, Ruggero Caravita, Giovanni Cerchiari, Alberto Rotondi, K. Chlouba, Romualdo Santoro, Z. Mazzotta, Akitaka Ariga, James William Storey, Alban Kellerbauer, Daniel Comparat, Alexey Dudarev, V. A. Matveev, Claude Amsler, R. Vaccarone, Patrick Nedelec, Johann Zmeskal, H. Derking, M. Subieta, Angela Gligorova, P. Yzombard, N. Pacifico, Stefano Aghion, R. S. Brusa, Luca Penasa, P. Bräunig, Alice Magnani, Sebastian Lehner, Eberhard Widmann, V. Lagomarsino, Massimo Caccia, V. Petráček, Jiro Kawada, L. Di Noto, M. C. Simon, S. Rosenberger, H. Holmestad, D. Krasnicky, Antonio Ereditato, G. Testera, Cristina Riccardi, Fabrizio Castelli, Michael Doser, Storey, J., Aghion, S., Amsler, C., Ariga, A., Ariga, T., Belov, A., Bonomi, G., Braunig, P., Bremer, J., Brusa, R., Cabaret, L., Caccia, M., Caravita, R., Castelli, F., Cerchiari, G., Chlouba, K., Cialdi, S., Comparat, D., Consolati, G., Derking, H., Di Noto, L., Doser, M., Dudarev, A., Ereditato, A., Ferragut, R., Fontana, A., Gerber, S., Giammarchi, M., Gligorova, A., Gninenko, S., Haider, S., Hogan, S., Holmestad, H., Huse, T., Jordan, E. J., Kawada, J., Kellerbauer, A., Kimura, M., Krasnicky, D., Lagomarsino, V., Lehner, S., Magnani, A., Malbrunot, C., Mariazzi, S., Matveev, V., Mazzotta, Z., Nebbia, G., Nedelec, P., Oberthaler, M., Pacifico, N., Penasa, L., Petracek, V., Pistillo, C., Prelz, F., Prevedelli, M., Ravelli, L., Riccardi, C., Rohne, O. M., Rosenberger, S., Rotondi, A., Sandaker, H., Santoro, R., Scampoli, P., Simon, M., Spacek, M., Strojek, I. M., Subieta, M., Testera, G., Vaccarone, R., Widmann, E., Yzombard, P., Zavatarelli, S., Zmeskal, J., 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
Atom interferometer, gas and liquid scintillators), Physics::Instrumentation and Detectors, 530 Physics, Context (language use), Cryogenics, Tracking (particle physics), Nuclear physics, Particle tracking detectors, Scintillators, scintillation and light emission processes (solid, gas and liquid scintillators), Silicon photomultiplier, Physics::Atomic and Molecular Clusters, Physics::Atomic Physics, Detectors and Experimental Techniques, Antihydrogen, Instrumentation, Mathematical Physics, Physics, Detector, antimatter. scintillating fibers, [SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], Particle tracking detector, antimatter. scintillating fibers, silicon photomultipliers, scintillation and light emission processes (solid, Scintillators, Antimatter, silicon photomultipliers
Abstract

see paper for full list of authors; International audience; The AEgIS experiment is an interdisciplinary collaboration between atomic, plasma and particle physicists, with the scientific goal of performing the first precision measurement of the Earth's gravitational acceleration on antimatter. The principle of the experiment is as follows: cold antihydrogen atoms are synthesized in a Penning-Malmberg trap and are Stark accelerated towards a moiré deflectometer, the classical counterpart of an atom interferometer, and annihilate on a position sensitive detector. Crucial to the success of the experiment is an antihydrogen detector that will be used to demonstrate the production of antihydrogen and also to measure the temperature of the anti-atoms and the creation of a beam. The operating requirements for the detector are very challenging: it must operate at close to 4 K inside a 1 T solenoid magnetic field and identify the annihilation of the antihydrogen atoms that are produced during the 1 μs period of antihydrogen production. Our solution—called the FACT detector—is based on a novel multi-layer scintillating fiber tracker with SiPM readout and off the shelf FPGA based readout system. This talk will present the design of the FACT detector and detail the operation of the detector in the context of the AEgIS experiment.

Published
2015
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