Author: "P. Yzombard" / Topic: 01 natural sciences - Searchworks@Jio Institute Digital Library Search Results

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1. Pulsed production of antihydrogen

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

2. 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

3. 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

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

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

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

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

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

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

7. Velocity-selected production of 2S3 metastable positronium

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

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

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

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

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

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

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

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

12. 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

13. 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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14. 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

15. AEgIS ¯ latest results

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

16. 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

17. 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

18. 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

19. Ultracold anions for high-precision antihydrogen experiments

Author: Alban Kellerbauer, Marianna Safronova, Giovanni Cerchiari, P. Yzombard, and Ulyana Safronova
Subjects: Physics, Quantum Physics, Atomic Physics (physics.atom-ph), Binding energy, General Physics and Astronomy, FOS: Physical sciences, Transition rate matrix, 7. Clean energy, 01 natural sciences, 010305 fluids & plasmas, Physics - Atomic Physics, Antiproton, Laser cooling, Antimatter, 0103 physical sciences, Physics::Atomic Physics, Atomic physics, 010306 general physics, Valence electron, Spectroscopy, Antihydrogen, Quantum Physics (quant-ph), Physics - Optics, Optics (physics.optics)
Abstract: Experiments with antihydrogen ($\overline{\text{H}}$) for a study of matter--antimatter symmetry and antimatter gravity require ultracold $\overline{\text{H}}$ to reach ultimate precision. A promising path towards anti-atoms much colder than a few kelvin involves the pre-cooling of antiprotons by laser-cooled anions. Due to the weak binding of the valence electron in anions - dominated by polarization and correlation effects - only few candidate systems with suitable transitions exist. We report on a combination of experimental and theoretical studies to fully determine the relevant binding energies, transition rates and branching ratios of the most promising candidate La$^{-}$. Using combined transverse and collinear laser spectroscopy, we determined the resonant frequency of the laser cooling transition to be $\nu = 96.592\,713(91)$ THz and its transition rate to be $A = 4.90(50) \times 10^{4}$ s$^{-1}$. Using a novel high-precision theoretical treatment of La$^-$ we calculated yet unmeasured energy levels, transition rates, branching ratios, and lifetimes to complement experimental information on the laser cooling cycle of La$^-$. The new data establish the suitability of La$^-$ for laser cooling and show that the cooling transition is significantly stronger than suggested by a previous theoretical study., Comment: 5 pages, 4 figures
Published: 2017
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20. 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

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

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

22. 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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23. 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

24. 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

25. 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

26. 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

27. 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

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

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

29. 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

30. 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

31. Investigation of silicon sensors for their use as antiproton annihilation detectors

Author: O. Ahlén, Ruggero Caravita, L. Cabaret, T. Huse, C. Regenfus, A. Sosa, V. A. Matveev, Rafael Ferragut, Alban Kellerbauer, Heidi Sandaker, P. Bräunig, G. Nebbia, S. Haider, S. N. Gninenko, Massimo Caccia, Cristina Riccardi, Marco Prevedelli, Patrick Nedelec, G. Burghart, Adriano Fontana, Giovanni Consolati, Sebastiano Mariazzi, S. Di Domizio, Johann Zmeskal, M. A. Subieta Vasquez, A. Magnani, Germano Bonomi, J. H. Derking, M. Spacek, P. Genova, D. Krasnický, Markus K. Oberthaler, Stefano Aghion, R. S. Brusa, L. Di Noto, Alberto Rotondi, Marco Giammarchi, J. Harasimowicz, Vojtech Petracek, Giovanni Cerchiari, Carsten Welsch, Carlo Canali, Angela Gligorova, P. Yzombard, C. Malbrunot, Eberhard Widmann, Alexey Dudarev, V. Lagomarsino, Sebastian Lehner, F. Moia, N. Pacifico, Clara Nellist, J. Bremer, T. Kaltenbacher, L. V. Jørgensen, A. Knecht, Sandra Zavatarelli, C. Da Via, Ole Røhne, G. Testera, Fabrizio Castelli, Michael Doser, F. Prelz, Daniel Comparat, Simone Cialdi, E. Jordan, A. S. Belov, 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: Silicon, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Antiprotons, Gravitational acceleration, 01 natural sciences, Nuclear physics, Planar, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], AEgIS, Detector, Pixel, Strip, Instrumentation, Detectors and Experimental Techniques, 010306 general physics, Antihydrogen, ComputingMilieux_MISCELLANEOUS, Physics, Large Hadron Collider, 010308 nuclear & particles physics, Antiproton Decelerator, Antiproton, Antimatter, Silicon, Antiprotons, Detector, AEgIS, Strip, Pixel
Abstract: We present here a new application of silicon sensors aimed at the direct detection of antinucleons annihilations taking place inside the sensor׳s volume. Such detectors are interesting particularly for the measurement of antimatter properties and will be used as part of the gravity measurement module in the AE g ¯ IS experiment at the CERN Antiproton Decelerator. One of the goals of the AE g ¯ IS experiment is to measure the gravitational acceleration of antihydrogen with 1% precision. Three different silicon sensor geometries have been tested with an antiproton beam to investigate their properties as annihilation detection devices: strip planar, 3D pixels and monolithic pixel planar. In all cases we were successfully detecting annihilations taking place in the sensor and we were able to make a first characterization of the clusters and tracks.
Published: 2014

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31 results on '"P. Yzombard"'

1. Pulsed production of antihydrogen

2. Gravity and antimatter: The AEgIS experiment at CERN

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

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

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

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

7. Velocity-selected production of 2S3 metastable positronium

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

9. Imaging a positronium cloud in a 1 Tesla

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

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

12. Antiproton tagging and vertex fitting in a Timepix3 detector

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

14. Compression of a mixed antiproton and electron non-neutral plasma to high densities

15. AEgIS ¯ latest results

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

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

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

19. Ultracold anions for high-precision antihydrogen experiments

20. Overview of Recent Work on Laser Excitation of Positronium for the Formation of Antihydrogen

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

22. Positronium for Antihydrogen Production in the AEGIS Experiment

23. Measurement of antiproton annihilation on Cu, Ag and Au with emulsion films

24. The AEgIS experiment: towards antimatter gravity measurements

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

26. Probing antimatter gravity – The AEGIS experiment at CERN

27. Positron manipulation and positronium laser excitation in AEgIS

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

29. The AEgIS experiment

30. Emulsion detectors for the antihydrogen detection in AEgIS

31. Investigation of silicon sensors for their use as antiproton annihilation detectors

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