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

Author

G. Testera, G. Nebbia, D. Krasnický, Fabrizio Castelli, A. Demetrio, Michael Doser, V. Lagomarsino, Rafael Ferragut, Alberto Rotondi, Giovanni Consolati, Germano Bonomi, Sebastiano Mariazzi, L. T. Glöggler, T. Wolz, A. Camper, Heidi Sandaker, M. Oberthaler, Angela Gligorova, Ruggero Caravita, Daniel Comparat, L. Di Noto, Sebastian Gerber, O. Khalidova, Patrick Nedelec, V. A. Matveev, F. Guatieri, A. Hinterberger, Marco Giammarchi, Massimo Caccia, Davide Pagano, V. Toso, C. Zimmer, F. Prelz, M. Fanì, M. Antonello, I. C. Tietje, E. Oswald, Luca Penasa, S.R. Müller, B. Rienäcker, Roberto S. Brusa, Romualdo Santoro, V. Petracek, A. S. Belov, S. Haider, Chloé Malbrunot, Ole Røhne, Nicola Zurlo, Laboratoire Aimé Cotton (LAC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
010302 applied physics, Physics, Bar (music), business.industry, Physics::Instrumentation and Detectors, Detector, General Physics and Astronomy, 02 engineering and technology, Scintillator, 021001 nanoscience & nanotechnology, Laser, 01 natural sciences, Signal, [PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph], law.invention, Optics, law, 0103 physical sciences, Microchannel plate detector, 0210 nano-technology, business, Antihydrogen, Excitation
Abstract

International audience; In this work we present a hybrid detection method providing simultaneous imaging and timing information suitable for fully monitoring positronium (Ps) formation, its laser excitation, and its spatial propagation for the first trials of pulsed antihydrogen ($\bar{H}$) production through a charge-exchange reaction with trapped antiprotons ($\bar{p}$). This combined method, based on the synchronous acquisition of an EJ-200 scintillation detector and a microchannel plate (MCP) detector with a dual readout (phosphor screen image and electrical pick-up signal), allows all relevant events in the experiment to be accurately determined in time while allowing high resolution images of e$^{+}$ from Ps laser photodissociations to be acquired. The timing calibration process of the two detectors discussed in details as well as the future perspectives opened by this method.

Published
2020
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2. Developments for pulsed antihydrogen production towards direct gravitational measurement on antimatter

Author

Alberto Rotondi, S. Müller, G. Nebbia, Davide Pagano, O. Khalidova, Massimo Caccia, L. Povolo, Giovanni Consolati, V. Toso, Germano Bonomi, Heidi Sandaker, V. Petráček, A. Hinterberger, L. T. Glöggler, Sebastiano Mariazzi, B. Rienäcker, C. Zimmer, L. Di Noto, Marco Giammarchi, Marco Prevedelli, M. Antonello, Chloé Malbrunot, G. Testera, Angela Gligorova, Ole Røhne, Nicola Zurlo, Sebastian Gerber, Fabrizio Castelli, Alban Kellerbauer, A. S. Belov, I. C. Tietje, D. Krasnicky, V. Lagomarsino, M. Fanì, L. Nowak, Romualdo Santoro, Michael Doser, Patrick Nedelec, E. Oswald, J. Fesel, V. Matveev, S. Haider, P. Cheinet, A. Demetrio, F. Guatieri, Luca Penasa, A. Camper, F. Prelz, Daniel Comparat, Ruggero Caravita, T. Wolz, Markus K. Oberthaler, R. S. Brusa, Rafael Ferragut, Fani M., Antonello M., Belov A., Bonomi G., Brusa R.S., Caccia M., Camper A., Caravita R., Castelli F., Comparat D., Cheinet P., Consolati G., Demetrio A., Di Noto L., Doser M., Ferragut R., Fesel J., Gerber S., Giammarchi M., Gligorova A., Gloggler L.T., Guatieri F., Haider S., Hinterberger A., Kellerbauer A., Khalidova O., Krasnicky D., Lagomarsino V., Malbrunot C., Nowak L., Mariazzi S., Matveev V., Muller S.R., Nebbia G., Nedelec P., Oberthaler M., Oswald E., Pagano D., Penasa L., Petracek V., Povolo L., Prelz F., Prevedelli M., Rienacker B., Rohne O.M., Rotondi A., Sandaker H., Santoro R., Testera G., Tietje I.C., Toso V., Wolz T., Zimmer C., Zurlo N., Laboratoire Aimé Cotton (LAC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Gravity (chemistry), Physics::General Physics, Antimatter, experimental methods, Gravity, Antiproton, magnetic field, Positronium, 01 natural sciences, 010305 fluids & plasmas, Nuclear physics, Gravitation, temperature: low, 0103 physical sciences, general relativity, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Atomic and Molecular Clusters, Physics::Atomic Physics, 010306 general physics, Antihydrogen, Mathematical Physics, Physics, gravitation: interaction, antihydrogen: production, talk: Kolymbari 2019/08/21, sensitivity, charge exchange, Condensed Matter Physics, pulsed, Atomic and Molecular Physics, and Optics, anti-p, equivalence principle, gravitation: acceleration, gravitation: local, experimental results
Abstract

International audience; A main scientific goal of the experiment is the direct measurement of the Earth’s local gravitational acceleration g on antihydrogen. The Weak Equivalence Principle is a foundation of General Relativity. It has been extensively tested with ordinary matter but very little is known about the gravitational interaction between matter and antimatter. Antihydrogen is produced in via resonant charge-exchange reaction between cold Rydberg-excited positronium and cooled down antiprotons. The achievements for the development of a pulsed cold antihydrogen source are presented. Large number of antiprotons, necessary for a significant production rate of antihydrogen, are captured, accumulated, compressed and cooled over an extended period of time. Positronium (Ps) is formed through e$^{+}$-Ps conversion in a silica porous target at 10 K temperature in a reflection geometry inside the main apparatus. The so-formed Ps cloud is then laser-excited to Rydberg levels, for the first time in a 1 T magnetic field. Consequently, a detailed characterization of the Ps source for antihydrogen production in magnetic field needed to be performed. Several detection techniques are extensively used to monitor antiproton and positron manipulations in the formation process of antihydrogen inside the main apparatus. Positronium detection techniques underwent extensive improvements in sensitivity during the last antiproton run. At the same time, major efforts to improve integrate and commission the detectors sensitive to antihydrogen production took place.

Published
2020
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3. 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
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