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389 results on '"Lagomarsino, V."'

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

Author

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., Fani, M., Ferragut, R., Gerber, S., Giammarchi, M., Gligorova, A., Guatieri, F., Hackstock, P., Haider, D., 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., Nowak, L., Oberthaler, M., Oswald, E., Pagano, D., Penasa, L., Petracek, V., Prelz, F., Prevedelli, M., Rienaecker, B., Robert, J., Rohne, 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., and Zurlo, N.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment, Physics - Atomic Physics
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 AE\=gIS 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
2022
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2. Rydberg-positronium velocity and self-ionization studies in 1T magnetic field and cryogenic environment

Author

Antonello, M., Belov, A., Brusa, G. Bonomi R. S., Caccia, M., Camper, A., Caravita, R., Castelli, F., Comparat, D., Consolati, G., Di Noto, L., Doser, M., Fani, M., Ferragut, R., Fesel, J., Gerber, S., Gligorova, A., Glöggler, L. T., Guatieri, F., Haider, S., Hinterberger, A., Khalidova, O., Krasnicky, 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., Rienäcker, B., Røhne, O. M., Rotondi, A., Sandaker, H., Santoro, R., Testera, G., Tietje, I. C., Wolz, T., Zimmer, C., and Zurlo, N.

Subjects
Physics - Atomic Physics
Abstract

We characterized the pulsed Rydberg-positronium production inside the AEgIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) apparatus in view of antihydrogen formation by means of a charge exchange reaction between cold antiprotons and slow Rydberg-positronium atoms. Velocity measurements on positronium along two axes in a cryogenic environment (10K) and in 1T magnetic field were performed. The velocimetry was done by MCP-imaging of photoionized positronium previously excited to the $n=3$ state. One direction of velocity was measured via Doppler-scan of this $n=3$-line, another direction perpendicular to the former by delaying the exciting laser pulses in a time-of-flight measurement. Self-ionization in the magnetic field due to motional Stark effect was also quantified by using the same MCP-imaging technique for Rydberg positronium with an effective principal quantum number $n_{eff}$ ranging between 14 and 22. We conclude with a discussion about the optimization of our experimental parameters for creating Rydberg-positronium in preparation for an efficient pulsed production of antihydrogen.

Published
2019
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3. Efficient $2^3S$ positronium production by stimulated decay from the $3^3P$ level

Author

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., Gerber, S., Gligorova, A., Guatieri, F., Hackstock, P., Haider, S., Hinterberger, A., Kellerbauer, A., Khalidova, O., Krasnicky, D., Lagomarsino, V., Lebrun, P., 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., Rienaecker, B., Robert, J., Rohne, O. M., Rotondi, A., Sandaker, H., Santoro, R., Testera, G., Tietje, I. C., Widmann, E., Wolz, T., Yzombard, P., Zimmer, C., and Zurlo, N.

Subjects
Physics - Atomic Physics, High Energy Physics - Experiment
Abstract

We investigate experimentally the possibility of enhancing the production of $2^3S$ positronium atoms by driving the $1^3S$-$3^3P$ and $3^3P$-$2^3S$ transitions, overcoming the natural branching ratio limitation of spontaneous decay from $3^3P$ to $2^3S$. The decay of $3^3P$ positronium atoms towards the $2^3S$ level has been effciently stimulated by a 1312.2nm 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 $ \times (3.1 \pm 1.0) $ in the $2^3S$ production efficiency, with respect to the case where only spontaneous decay is present, was obtained., Comment: 6 pages, 4 figures

Published
2019
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4. Velocity selected production of $2^3S$ metastable positronium

Author

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., Gerber, S., 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., Mariazzi, S., Matveev, V., Muller, S. R., Nebbia, G., Nedelec, P., Oberthaler, M., Pagano, D., Penasa, L., Petracek, V., Prelz, F., Prevedelli, M., Rienaecker, B., Robert, J., Rohne, O. M., Rotondi, A., Sandaker, H., Santoro, R., Smestad, L., Sorrentino, F., Testera, G., Tietje, I. C., Widmann, E., Yzombard, P., Zimmer, C., and Zurlo, N.

Subjects
Physics - Atomic 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., Comment: 6 pages, 3 figures, 1 table

Published
2018
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5. Measurement of antiproton annihilation on Cu, Ag and Au with emulsion films

Author

Aghion, S., Amsler, C., Ariga, A., Ariga, T., Bonomi, G., Braunig, 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., Hinterberger, A., Holmestad, H., Huse, T., Kawada, J., Kellerbauer, A., Kimura, M., Krasnicky, D., Lagomarsino, V., Lansonneur, P., Lebrun, P., Malbrunot, C., Mariazzi, S., Matveev, V., Mazzotta, Z., Muller, 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., Rohne, 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., and Zurlo, N.

Subjects
High Energy Physics - Experiment, Physics - Instrumentation and Detectors
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.

Published
2017
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6. A cryogenic tracking detector for antihydrogen detection in the [formula omitted] experiment

Author

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., and Zurlo, N.

Published
2020
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7. Annihilation of low energy antiprotons in silicon

Author

Aghion, S., Ahlén, O., Belov, A. S., Bonomi, G., Bräunig, P., Bremer, J., Brusa, R. S., Burghart, G., Cabaret, L., Caccia, M., Canali, C., Caravita, R., Castelli, F., Cerchiari, G., Cialdi, S., Comparat, D., Consolati, G., Derking, J. H., Di Domizio, S., Di Noto, L., Doser, M., Dudarev, A., Ferragut, R., Fontana, A., Genova, P., Giammarchi, M., Gligorova, A., Gninenko, S. N., Haider, S., Harasimowicz, J., Huse, T., Jordan, E., Jørgensen, L. V., Kaltenbacher, T., Kellerbauer, A., Knecht, A., Krasnický, D., Lagomarsino, V., Magnani, A., Mariazzi, S., Matveev, V. A., Moia, F., Nebbia, G., Nédélec, P., Pacifico, N., Petrácek, V., Prelz, F., Prevedelli, M., Regenfus, C., Riccardi, C., Røhne, O., Rotondi, A., Sandaker, H., Sosa, A., Vasquez, M. A. Subieta, Špacek, M., Testera, G., Welsch, C. P., and Zavatarelli, S.

Subjects
Physics - Instrumentation and Detectors
Abstract

The goal of the AE$\mathrm{\bar{g}}$IS experiment at the Antiproton Decelerator (AD) at CERN, is to measure directly the Earth's gravitational acceleration on antimatter. To achieve this goal, the AE$\mathrm{\bar{g}}$IS collaboration will produce a pulsed, cold (100 mK) antihydrogen beam with a velocity of a few 100 m/s and measure the magnitude of the vertical deflection of the beam from a straight path. The final position of the falling antihydrogen will be detected by a position sensitive detector. This detector will consist of an active silicon part, where the annihilations take place, followed by an emulsion part. Together, they allow to achieve 1$%$ precision on the measurement of $\bar{g}$ with about 600 reconstructed and time tagged annihilations. We present here, to the best of our knowledge, the first direct measurement of antiproton annihilation in a segmented silicon sensor, the first step towards designing a position sensitive silicon detector for the AE$\mathrm{\bar{g}}$IS experiment. We also present a first comparison with Monte Carlo simulations (GEANT4) for antiproton energies below 5 MeV, Comment: 21 pages in total, 29 figures, 3 tables

Published
2013

8. Prospects for measuring the gravitational free-fall of antihydrogen with emulsion detectors

Author

AEgIS Collaboration, Aghion, S., Ahlén, O., Amsler, C., Ariga, A., Ariga, T., Belov, A. S., Bonomi, G., Bräunig, P., Bremer, J., Brusa, R. S., Cabaret, L., Canali, C., Caravita, R., Castelli, F., Cerchiari, G., Cialdi, S., Comparat, D., Consolati, G., Derking, J. H., Di Domizio, S., Di Noto, L., Doser, M., Dudarev, A., Ereditato, A., Ferragut, R., Fontana, A., Genova, P., Giammarchi, M., Gligorova, A., Gninenko, S. N., Haider, S., Harasimovicz, J., Hogan, S. D., Huse, T., Jordan, E., Jørgensen, L. V., Kaltenbacher, T., Kawada, J., Kellerbauer, A., Kimura, M., Knecht, A., Krasnický, D., Lagomarsino, V., Magnani, A., Mariazzi, S., Matveev, V. A., Moia, F., Nebbia, G., Nédélec, P., Oberthaler, M. K., Pacifico, N., Petrácek, V., Pistillo, C., Prelz, F., Prevedelli, M., Regenfus, C., Riccardi, C., Røhne, O., Rotondi, A., Sandaker, H., Scampoli, P., Sosa, A., Storey, J., Vasquez, M. A. Subieta, Spacek, M., Testera, G., Trezzi, D., Vaccarone, R., Welsch, C. P., and Zavatarelli, S.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract

The main goal of the AEgIS experiment at CERN is to test the weak equivalence principle for antimatter. AEgIS will measure the free-fall of an antihydrogen beam traversing a moir\'e deflectometer. The goal is to determine the gravitational acceleration g for antihydrogen with an initial relative accuracy of 1% by using an emulsion detector combined with a silicon micro-strip detector to measure the time of flight. Nuclear emulsions can measure the annihilation vertex of antihydrogen atoms with a precision of about 1 - 2 microns r.m.s. We present here results for emulsion detectors operated in vacuum using low energy antiprotons from the CERN antiproton decelerator. We compare with Monte Carlo simulations, and discuss the impact on the AEgIS project., Comment: 20 pages, 16 figures, 3 tables

Published
2013
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9. Formation Of A Cold Antihydrogen Beam in AEGIS For Gravity Measurements

Author

Testera, G., Belov, A. S., Bonomi, G., Boscolo, I., Brambilla, N., Brusa, R. S., Byakov, V. M., Cabaret, L., Canali, C., Carraro, C., Castelli, F., Cialdi, S., de Combarieu, M., Comparat, D., Consolati, G., Djourelov, N., Doser, M., Drobychev, G., Dupasquier, A., Fabris, D., Ferragut, R., Ferrari, G., Fischer, A., Fontana, A., Forget, P., Formaro, L., Lunardon, M., Gervasini, A., Giammarchi, M. G., Gninenko, S. N., Gribakin, G., Heyne, R., Hogan, S. D., Kellerbauer, A., Krasnicky, D., Lagomarsino, V., Manuzio, G., Mariazzi, S., Matveev, V. A., Merkt, F., Moretto, S., Morhard, C., Nebbia, G., Nedelec, P., Oberthaler, M. K., Pari, P., Petracek, V., Prevedelli, M., Al-Qaradawi, I. Y., Quasso, F., Rohne, O., Pesente, S., Rotondi, A., Stapnes, S., Sillou, D., Stepanov, S. V., Stroke, H. H., Tino, G., Vairo, A., Viesti, G., Walters, H., Warring, U., Zavatarelli, S., Zenoni, A., and Zvezhinskij, D. S.

Subjects
Physics - Atomic Physics, General Relativity and Quantum Cosmology
Abstract

The formation of the antihydrogen beam in the AEGIS experiment through the use of inhomogeneous electric fields is discussed and simulation results including the geometry of the apparatus and realistic hypothesis about the antihydrogen initial conditions are shown. The resulting velocity distribution matches the requirements of the gravity experiment. In particular it is shown that the inhomogeneous electric fields provide radial cooling of the beam during the acceleration., Comment: Invited talk at Pbar08 - Workshop on Cold Antimatter Plasmas and Application to Fundamental Physics, Okinawa, Japan, 2008

Published
2008
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10. Production of Slow Protonium in Vacuum

Author

Zurlo, N., Amoretti, M., Amsler, C., Bonomi, G., Carraro, C., Cesar, C. L., Charlton, M., Doser, M., Fontana, A., Funakoshi, R., Genova, P., Hayano, R. S., Jorgensen, L. V., Kellerbauer, A., Lagomarsino, V., Landua, R., Rizzini, E. Lodi, Macri', M., Madsen, N., Manuzio, G., Mitchard, D., Montagna, P., Posada, L. G., Pruys, H., Regenfus, C., Rotondi, A., Testera, G., Van der Werf, D. P., Variola, A., Venturelli, L., and Yamazaki, Y.

Subjects
High Energy Physics - Experiment
Abstract

We describe how protonium, the quasi-stable antiproton-proton bound system, has been synthesized following the interaction of antiprotons with the molecular ion H$_2^+$ in a nested Penning trap environment. From a careful analysis of the spatial distributions of antiproton annihilation events in the ATHENA experiment, evidence is presented for protonium production with sub-eV kinetic energies in states around $n$ = 70, with low angular momenta. This work provides a new 2-body system for study using laser spectroscopic techniques., Comment: 9 pages with 5 figures and 1 table. Proceedings of the 4th International Conference on Trapped Charged Particles and Fundamental Physics (TCP 06), published in Hyperfine Interactions

Published
2008
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11. AEgIS at ELENA: outlook for physics with a pulsed cold antihydrogen beam

Author

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., and Zurlo, N.

Published
2018

12. Evidence For The Production Of Slow Antiprotonic Hydrogen In Vacuum

Author

Zurlo, N., Amoretti, M., Amsler, C., Bonomi, G., Carraro, C., Cesar, C. L., Charlton, M., Doser, M., Fontana, A., Funakoshi, R., Genova, P., Hayano, R. S., Jorgensen, L. V., Kellerbauer, A., Lagomarsino, V., Landua, R., Rizzini, E. Lodi, Macrì, M., Madsen, N., Manuzio, G., Mitchard, D., Montagna, P., Posada, L. G., Pruys, H., Regenfus, C., Rotondi, A., Testera, G., Van der Werf, D. P., Variola, A., Venturelli, L., and Yamazaki, Y.

Subjects
High Energy Physics - Experiment
Abstract

We present evidence showing how antiprotonic hydrogen, the quasistable antiproton-proton (pbar-p) bound system, has been synthesized following the interaction of antiprotons with the hydrogen molecular ion (H2+) in a nested Penning trap environment. From a careful analysis of the spatial distributions of antiproton annihilation events, evidence is presented for antiprotonic hydrogen production with sub-eV kinetic energies in states around n=70, and with low angular momenta. The slow antiprotonic hydrogen may be studied using laser spectroscopic techniques., Comment: 5 pages with 4 figures. Published as Phys. Rev. Letters 97, 153401 (2006), in slightly different form

Published
2007
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13. Cold-Antimatter Physics

Author

ATHENA Collaboration, Amoretti, M., Amsler, C., Bonomi, G., Bowe, P. D., Canali, C., Carraro, C., Cesar, C. L., Charlton, M., Doser, M., Fontana, A., Fujiwara, M. C., Funakoshi, R., Genova, P., Hangst, J. S., Hayano, R. S., Johnson, I., Jorgensen, L. V., Kellerbauer, A., Lagomarsino, V., Landua, R., Rizzini, E. Lodi, Macri, M., Madsen, N., Manuzio, G., Mitchard, D., Montagna, P., Pruys, H., Regenfus, C., Rotondi, A., Testera, G., Variola, A., Venturelli, L., van der Werf, D. P., Yamazaki, Y., and Zurlo, N.

Subjects
High Energy Physics - Experiment
Abstract

The CPT theorem and the Weak Equivalence Principle are foundational principles on which the standard description of the fundamental interactions is based. The validity of such basic principles should be tested using the largest possible sample of physical systems. Cold neutral antimatter (low-energy antihydrogen atoms) could be a tool for testing the CPT symmetry with high precision and for a direct measurement of the gravitational acceleration of antimatter. After several years of experimental efforts, the production of low-energy antihydrogen through the recombination of antiprotons and positrons is a well-established experimental reality. An overview of the ATHENA experiment at CERN will be given and the main experimental results on antihydrogen formation will be reviewed., Comment: Proceedings of the XLIII International Meeting on Nuclear Physics, Bormio (Italy), March 13-20 (2005). 10 pages, 4 figures, 1 table

Published
2005

14. ATHENA -- First Production of Cold Antihydrogen and Beyond

Author

ATHENA Collaboration, Kellerbauer, A., Amoretti, M., Amsler, C., Bonomi, G., Bowe, P. D., Canali, C., Carraro, C., Cesar, C. L., Charlton, M., Doser, M., Fontana, A., Fujiwara, M. C., Funakoshi, R., Genova, P., Hangst, J. S., Hayano, R. S., Johnson, I., Jørgensen, L. V., Lagomarsino, V., Landua, R., Rizzini, E. Lodi, Macrí, M., Madsen, N., Manuzio, G., Mitchard, D., Montagna, P., Pruys, H., Regenfus, C., Rotondi, A., Testera, G., Variola, A., Venturelli, L., van der Werf, D. P., Yamazaki, Y., and Zurlo, N.

Subjects
High Energy Physics - Experiment
Abstract

Atomic systems of antiparticles are the laboratories of choice for tests of CPT symmetry with antimatter. The ATHENA experiment was the first to report the production of copious amounts of cold antihydrogen in 2002. This article reviews some of the insights that have since been gained concerning the antihydrogen production process as well as the external and internal properties of the produced anti-atoms. Furthermore, the implications of those results on future prospects of symmetry tests with antimatter are discussed., Comment: Proc. of the Third Meeting on CPT and Lorentz Symmetry, Bloomington (Indiana), USA, August 2004, edited by V. A. Kostelecky (World Scientific, Singapore). 10 pages, 5 figures, 1 table. Author affiliations corr

Published
2004

15. Production of Cold Antihydrogen with ATHENA for Fundamental Studies

Author

ATHENA Collaboration, Kellerbauer, A., Amoretti, M., Amsler, C., Bonomi, G., Bowe, P. D., Canali, C., Carraro, C., Cesar, C. L., Charlton, M., Doser, M., Fontana, A., Fujiwara, M. C., Funakoshi, R., Genova, P., Hangst, J. S., Hayano, R. S., Johnson, I., Jørgensen, L. V., Lagomarsino, V., Landua, R., Rizzini, E. Lodi, Macrí, M., Madsen, N., Manuzio, G., Mitchard, D., Montagna, P., Pruys, H., Regenfus, C., Rotondi, A., Testera, G., Variola, A., Venturelli, L., van der Werf, D. P., Yamazaki, Y., and Zurlo, N.

Subjects
High Energy Physics - Experiment
Abstract

Since the beginning of operations of the CERN Antiproton Decelerator in July 2000, the successful deceleration, storage and manipulation of antiprotons has led to remarkable progress in the production of antimatter. The ATHENA Collaboration were the first to create and detect cold antihydrogen in 2002, and we can today produce large enough amounts of antiatoms to study their properties as well as the parameters that govern their production rate., Comment: Proceedings of the XXXIXth Rencontres de Moriond, 2004, Electroweak Interactions and Unified Theories, Ed. J. Tran Thanh Van. 8 pages, 7 figures, 1 table

Published
2004

16. Three Dimensional Annihilation Imaging of Antiprotons in a Penning Trap

Author

Fujiwara, M. C., Amoretti, M., Bonomi, G., Bouchta, A., Bowe, P. D., Carraro, C., Cesar, C. L., Charlton, M., Doser, M., Filippini, V., Fontana, A., Funakoshi, R., Genova, P., Hangst, J. S., Hayano, R. S., Jorgensen, L. V., Lagomarsino, V., Landuad, R., Lindelof, D., Rizzini, E. Lodi, Macri, M., Madsen, N., Marchesotti, M., Montagna, P., Pruys, H., Regenfus, C., Rielder, P., Rotondi, A., Testera, G., Variola, A., and van der Werf, D. P.

Subjects
Physics - Plasma Physics, High Energy Physics - Experiment, Nuclear Experiment, Physics - General Physics
Abstract

We demonstrate three-dimensional annihilation imaging of antiprotons trapped in a Penning trap. Exploiting unusual feature of antiparticles, we investigate a previously unexplored regime in particle transport; the proximity of the trap wall. Particle loss on the wall, the final step of radial transport, is observed to be highly non-uniform, both radially and azimuthally. These observations have considerable implications for the production and detection of antihydrogen atoms., Comment: Invited Talk at NNP03, Workshop on Non-Neutral Plasmas, 2003

Published
2004
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17. The First Cold Antihydrogen

Author

Fujiwara, M. C., Amoretti, M., Amsler, C., Bonomi, G., Bouchta, A., Bowe, P. D., Carraro, C., Cesar, C. L., Charlton, M., Doser, M., Filippini, V., Fontana, A., Funakoshi, R., Genova, P., Hangst, J. S., Hayano, R. S., Jorgensen, L. V., Lagomarsino, V., Landua, R., Lindelof, D., Rizzini, E. Lodi, Macri, M., Madsen, N., Marchesotti, M., Montagna, P., Pruys, H., Regenfus, C., Rielder, P., Rotondi, A., Testera, G., Variola, A., and van der Werf, D. P.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
Abstract

Antihydrogen, the atomic bound state of an antiproton and a positron, was produced at low energy for the first time by the ATHENA experiment, marking an important first step for precision studies of atomic antimatter. This paper describes the first production and some subsequent developments., Comment: Invitated Talk at COOL03, International Workshop on Beam Cooling and Related Topics, to be published in NIM A

Published
2004
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18. Positron plasma diagnostics and temperature control for antihydrogen production

Author

ATHENA Collaboration, Amoretti, M., Amsler, C., Bonomi, G., Bouchta, A., Bowe, P. D., Carraro, C., Cesar, C. L., Charlton, M., Doser, M., Filippini, V., Fontana, A., Fujiwara, M. C., Funakoshi, R., Genova, P., Hangst, J. S., Hayano, R. S., Jorgensen, L. V., Lagomarsino, V., Landua, R., Lindelof, D., Rizzini, E. Lodi, Macri', M., Madsen, N., Manuzio, G., Montagna, P., Pruys, H., Regenfus, C., Rotondi, A., Testera, G., Variola, A., and van der Werf, D. P.

Subjects
Physics - Plasma Physics, High Energy Physics - Experiment, Nuclear Experiment
Abstract

Production of antihydrogen atoms by mixing antiprotons with a cold, confined, positron plasma depends critically on parameters such as the plasma density and temperature. We discuss non-destructive measurements, based on a novel, real-time analysis of excited, low-order plasma modes, that provide comprehensive characterization of the positron plasma in the ATHENA antihydrogen apparatus. The plasma length, radius, density, and total particle number are obtained. Measurement and control of plasma temperature variations, and the application to antihydrogen production experiments are discussed., Comment: 5 pages, 4 figures, to be published in Phys. Rev. Lett

Published
2003
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19. First Production and Detection of Cold Antihydrogen Atoms

Author

Fujiwara, M. C., Amoretti, M., Amsler, C., Bonomi, G., Bouchta, A., Bowe, P., Carraro, C., Cesar, C. L., Charlton, M., Doser, M., Filippini, V., Fontana, A., Funakoshi, R., Genova, P., Hangst, J. S., Hayano, R. S., Jorgensen, L. V., Lagomarsino, V., Landua, R., Lindelof, D., Rizzini, E. Lodi, Marchesotti, M., Macri, M., Madsen, N., Montagna, P., Pruys, H., Regenfus, C., Rielder, P., Rotondi, A., Testera, G., Variola, A., and van der Werf, D. P.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
Abstract

The ATHENA experiment recently produced the first atoms of cold antihydrogen. This paper gives a brief review of how this was achieved., Comment: Invited talk at Int. Conf. on Low Energy Antiprotons 2003 (LEAP03), to be published in NIM B

Published
2003
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20. Characterization of a transmission positron/positronium converter for antihydrogen production

Author

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., and Lyckegaard, F.

Published
2017
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21. Direct detection of antiprotons with the Timepix3 in a new electrostatic selection beamline

Author

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., and Zurlo, N.

Published
2016
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22. Positron bunching and electrostatic transport system for the production and emission of dense positronium clouds into vacuum

Author

Aghion, S., Amsler, C., Ariga, A., Ariga, T., Belov, A.S., Bonomi, G., Bräunig, P., Bremer, J., Brusa, R.S., Cabaret, L., Caccia, M., Caravita, R., Castelli, F., Cerchiari, G., Chlouba, K., Cialdi, S., Comparat, D., Consolati, G., Demetrio, A., Di Noto, L., Doser, M., Dudarev, A., Ereditato, A., Evans, C., Fesel, J., Fontana, A., Forslund, O.K., Gerber, S., Giammarchi, M., Gligorova, A., Gninenko, S., Guatieri, F., Haider, S., Holmestad, H., Huse, T., Jernelv, I.L., Jordan, E., Kaltenbacher, T., Kellerbauer, A., Kimura, M., Koetting, T., Krasnicky, D., Lagomarsino, V., Lebrun, P., Lansonneur, P., Lehner, S., Liberadzka, J., Malbrunot, C., Mariazzi, S., Marx, L., Matveev, V., Mazzotta, Z., Nebbia, G., Nedelec, P., Oberthaler, M., Pacifico, N., Pagano, D., Penasa, L., Petracek, V., Pistillo, C., Prelz, F., Prevedelli, M., Ravelli, L., Rienäcker, B., Røhne, O.M., Rosenberger, S., Rotondi, A., Sacerdoti, M., Sandaker, H., Santoro, R., Scampoli, 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.

Published
2015
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23. The AEGIS experiment at CERN : Measuring the free fall of antihydrogen

Author

The AEGIS Collaboration, Kellerbauer, A., Allkofer, Y., Amsler, C., Belov, A. S., Bonomi, G., Bräunig, P., Bremer, J., Brusa, R. S., Burghart, G., Cabaret, L., Canali, C., Castelli, F., Chlouba, K., Cialdi, S., Comparat, D., Consolati, G., Dassa, L., Di Noto, L., Donzella, A., Doser, M., Dudarev, A., Eisel, T., Ferragut, R., Ferrari, G., Fontana, A., Genova, P., Giammarchi, M., Gligorova, A., Gninenko, S. N., Haider, S., Hansen, J. P., Haug, F., Hogan, S. D., Jørgensen, L. V., Kaltenbacher, T., Krasnický, D., Lagomarsino, V., Mariazzi, S., Matveev, V. A., Merkt, F., Moia, F., Nebbia, G., Nédélec, P., Niinikoski, T., Oberthaler, M. K., Perini, D., Petráček, V., Prelz, F., Prevedelli, M., Regenfus, C., Riccardi, C., Rochet, J., Røhne, O., Rotondi, A., Sacerdoti, M., Sandaker, H., Špaček, M., Storey, J., Testera, G., Tokareva, A., Trezzi, D., Vaccarone, R., Villa, F., Warring, U., Zavatarelli, S., Zenoni, A., Bühler, Paul, editor, Hartmann, Olaf, editor, Marton, Johann, editor, Suzuki, Ken, editor, Widmann, Eberhard, editor, and Zmeskal, Johann, editor

Published
2012
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24. Investigation of silicon sensors for their use as antiproton annihilation detectors

Author

Pacifico, N., Aghion, S., Ahlén, O., Belov, A.S., Bonomi, G., Bräunig, P., Bremer, J., Brusa, R.S., Burghart, G., Cabaret, L., Caccia, M., Canali, C., Caravita, R., Castelli, F., Cerchiari, G., Cialdi, S., Comparat, D., Consolati, G., Da Vià, C., Derking, J.H., Di Domizio, S., Di Noto, L., Doser, M., Dudarev, A., Ferragut, R., Fontana, A., Genova, P., Giammarchi, M., Gligorova, A., Gninenko, S.N., Haider, S., Harasimowicz, J., Huse, T., Jordan, E., Jørgensen, L.V., Kaltenbacher, T., Kellerbauer, A., Knecht, A., Krasnický, D., Lagomarsino, V., Lehner, S., Magnani, A., Malbrunot, C., Mariazzi, S., Matveev, V.A., Moia, F., Nebbia, G., Nellist, C., Nédélec, P., Oberthaler, M.K., Petráček, V., Prelz, F., Prevedelli, M., Regenfus, C., Riccardi, C., Røhne, O., Rotondi, A., Sandaker, H., Sosa, A., Subieta Vasquez, M.A., Špaček, M., Testera, G., Welsch, C.P., Widmann, E., Yzombard, P., Zavatarelli, S., and Zmeskal, J.

Published
2014
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25. Production of slow protonium in vacuum

Author

Zurlo, N., Rizzini, E. Lodi, Venturelli, L., Amoretti, M., Carraro, C., Lagomarsino, V., Macrì, M., Manuzio, G., Testera, G., Variola, A., Amsler, C., Pruys, H., Regenfus, C., Bonomi, G., Fontana, A., Genova, P., Montagna, P., Rotondi, A., Cesar, C. L., Charlton, M., Mitchard, D., Jørgensen, L. V., Madsen, N., Van der Werf, D. P., Doser, M., Kellerbauer, A., Landua, R., Funakoshi, R., Hayano, R. S., Posada, L. G., Yamazaki, Y., Dilling, J., editor, Comyn, M., editor, Thompson, J., editor, and Gwinner, G., editor

Published
2007
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26. PRODUCTION AND STUDY OF ANTIHYDROGEN IN THE ATHENA EXPERIMENT

Author

Genova, P., Amoretti, M., Amsler, C., Bonomi, G., Bowe, P. D., Canali, C., Carraro, C., Cesar, C. L., Charlton, M., Doser, M., Fontana, A., Fujiwara, M. C., Funakoshi, R., Hangst, J. S., Hayano, R. S., Jørgensen, L. V., Kellerbauer, A., Lagomarsino, V., Landua, R., Lodi Rizzinia, E., Macrí, M., Madsen, N., Manuzio, G., Mitchard, D., Montagna, P., Pruys, H., Regenfus, C., Rotondi, A., Testera, G., Variola, A., Venturelli, L., Yamazaki, Y., van der Werf, D. P., Zurlo, N., Čechák, Tomas, editor, Jenkovszky, László, editor, and Karpenko, Iurii, editor

Published
2006
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27. Antihydrogen Production and Precision Spectroscopy with ATHENA/AD-1

Author

Amsler, C., Bendiscioli, G., Bonomi, G., Bowe, P., Carraro, C., Cesar, C. L., Charlton, M., Collier, M. J. T., Doser, M., Fine, K., Fontana, A., Fujiwara, M. C., Funakoshi, R., Hangst, J., Hayano, R. S., Higaki, H., Holzscheiter, M. H., Joffrain, W., Jøergensen, L. V., Kleppner, D., Lagomarsino, V., Landua, R., Lindelof, D., Lodi-Rizzini, E., Macri, M., Manuzio, D., Manuzio, G., Marchesotti, M., Montagna, P., Pruys, H., Regenfus, C., Riedler, P., Rotondi, A., Rouleau, G., Testera, G., Watson, T. L., van der Werf, D. P., Yamazaki, T., Yamazaki, Y., Beig, R., editor, Ehlers, J., editor, Frisch, U., editor, Hepp, K., editor, Hillebrandt, W., editor, Imboden, D., editor, Jaffe, R. L., editor, Kippenhahn, R., editor, Lipowsky, R., editor, Löhneysen, H. v., editor, Ojima, I., editor, Weidenmüller, H. A., editor, Wess, J., editor, Zittartz, J., editor, Karshenboim, Savely G., editor, Bassani, F., editor, Pavone, F.S., editor, Inguscio, M., editor, and Hänsch, T.W., editor

Published
2001
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28. The AEgIS experiment

Author

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, P., Semeria, L., Simon, M., Spacek, M., Storey, J., Strojek, I. M., Subieta, M., Widmann, E., Yzombard, P., Zavatarelli, S., Zmeskal, J., and (AEgIS Collaboration)

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

Author

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, P., Simon, M., Špaček, M., Storey, J., Strojek, I. M., Subieta, M., Testera, G., Widmann, E., Yzombard, P., Zavatarelli, S., and Zmeskal, J.

Published
2015
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30. Pulsed Production of Antihydrogen in AEgIS

Author

Zurlo, N., Amsler, C., Antonello, M., Belov, A., Bonomi, G., Brusa, R. S., Caccia, M., Camper, A., Caravita, R., Castelli, F., Cheinet, P., Comparat, D., Consolati, G., Demetrio, A., Di Noto, L., Doser, M., Fani, 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., Mariazzi, S., Matveev, V., Muller, R., Nebbia, G., Nedelec, P., Nowak, L., 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., Yzombard, P., and Zimmer, C.

Subjects
Antihydrogen, antiprotons, Accelerators and Storage Rings, Antihydrogen, antiprotons
Abstract

Cold antihydrogen atoms are a powerful tool to probe the validity of fundamental physics laws, and it's clear that colder atoms, generally speaking, allow an increased level of precision. After the first production of cold antihydrogen ($\bar{H}$) in 2002, experimental efforts have progressed continuously (trapping, beam formation, spectroscopy), with competitive results already achieved by adapting to cold antiatoms techniques previously well developed for ordinary atoms. Unfortunately, the number of $\bar{H}$ atoms that can be produced in dedicated experiments is many orders of magnitude smaller than available hydrogen atoms, which are at hand in large amount, so the development of novel techniques that allow the production of $\bar{H}$ with well defined conditions (and possibly control its formation time and energy levels) is essential to improve the sensitivity of the methods applied by the different experiments. We present here the first experimental results concerning the production of $\bar{H}$ in a pulsed mode where the time when 90\% of the atoms are produced is known with an uncertainty of around 250~ns. The pulsed $\bar{H}$ source is generated by the charge-exchange reaction between Rydberg positronium atoms ($Ps$) and trapped antiprotons ($\bar{p}$), cooled and manipulated in an electromagnetic trap: $$ \bar{ p}+Ps^* \rightarrow \bar{H}^* + e^- $$ where Rydberg positronium atoms, in turn, are produced through the implantation of a pulsed positron beam into a mesoporous silica target, and are excited by two subsequent laser pulses, the first to $n=3$, the second to the needed Rydberg level ($n \simeq 17$). The pulsed production allows the control of the antihydrogen temperature, and facilitates the tunability of the Rydberg states, their de-excitation by pulsed lasers and the manipulation through electric field gradients. In fact, the production of pulsed antihydrogen is a major milestone in the AEgIS experiment to perform direct measurements of the validity of the Weak Equivalence Principle for antimatter.

Published
2022

31. AEg̅IS latest results

Author

Guatieri F., Aghion S., Amsler C., Angela G., Bonomi G., Brusa R.S., Caccia M., Caravita R., Castelli F., Cerchiari G., Comparat D., Consolati G., Demetrio A., Di Noto L., Doser M., Evans C., Fanì M., Ferragut R., Fesel J., Fontana A., Gerber S., Giammarchi M., Gligorova A., 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., Prelz F., Prevedelli M., Rienaecker B., Robert J., Rhne. O.M., Rotondi A., Sacerdoti M., Sandaker H., Santoro R., Simon M., Smestad L., Sorrentino F., Testera G., Tietje I.C., Widmann E., Yzombard P., Zimmer C., Zmeskal J., and Zurlo N.

Subjects
Physics, QC1-999
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
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32. Towards the first measurement of matter-antimatter gravitational interaction

Author

Evans C., 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., Doser M., 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., 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., 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, QC1-999
Abstract

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 103 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
2018
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33. The AEgIS Experiment: Measuring the Gravitational Interaction of Antimatter

Author

Knecht, A., Aghion, S., Ahlén, O., Amsler, C., Ariga, A., Ariga, T., Belov, A. S., Bonomi, G., Bräunig, P., Bremer, J., Brusa, R. S., Cabaret, L., Canali, C., Caravita, R., Castelli, F., Cerchiari, G., Cialdi, S., Comparat, D., Consolati, G., Derking, J. H., Domizio, S. Di, Noto, L. Di, Doser, M., Dudarev, A., Ereditato, A., Ferragut, R., Fontana, A., Genova, P., Giammarchi, M., Gligorova, A., Gninenko, S. N., Haider, S., Hogan, S. D., Huse, T., Jordan, E., Jørgensen, L. V., Kaltenbacher, T., Kawada, J., Kellerbauer, A., Kimura, M., Krasnický, D., Lagomarsino, V., Lehner, S., Malbrunot, C., Mariazzi, S., Matveev, V. A., Merkt, F., Moia, F., Nebbia, G., Nédélec, P., Oberthaler, M. K., Pacifico, N., Petráček, V., Pistillo, C., Prelz, F., Prevedelli, M., Regenfus, C., Riccardi, C., Røhne, O., Rotondi, A., Sandaker, H., Scampoli, P., Storey, J., Subieta Vasquez, M. A., Špaček, M., Testera, G., Trezzi, D., Vaccarone, R., Widmann, E., Zavatarelli, S., and Zmeskal, J.

Published
2014
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34. Measuring the gravitational free-fall of antihydrogen

Author

Storey, J., Aghion, S., Ahlén, O., Amsler, C., Ariga, A., Ariga, T., Belov, A. S., Bonomi, G., Bräunig, P., Bremer, J., S. Brusa, R., Cabaret, L., Canali, C., Caravita, R., Castelli, F., Cerchiari, G., Cialdi, S., Comparat, D., Consolati, G., Derking, J. H., Domizio, S. Di, Noto, L. Di, Doser, M., Dudarev, A., Ereditato, A., Ferragut, R., Fontana, A., Genova, P., Giammarchi, M., Gligorova, A., Gninenko, S. N., Haider, S., Hogan, S. D., Huse, T., Jordan, E., Jørgensen, L. V., Kaltenbacher, T., Kawada, J., Kellerbauer, A., Kimura, M., Knecht, A., Krasnický, D., Lagomarsino, V., Lehner, S., Malbrunot, C., Mariazzi, S., Matveev, V. A., Merkt, F., Moia, F., Nebbia, G., Nédélec, P., Oberthaler, M. K., Pacifico, N., Petráček, V., Pistillo, C., Prelz, F., Prevedelli, M., Regenfus, C., Riccardi, C., Røhne, O., Rotondi, A., Sandaker, H., Scampoli, P., Subieta Vasquez, M. A., Špaček, M., Testera, G., Trezzi, D., Vaccarone, R., Widmann, E., Zavatarelli, S., and Zmeskal, J.

Published
2014
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35. The AEGIS detection system for gravity measurements

Author

Fabris, D., Belov, A.S., Bonomi, G., Boscolo, I., Brambilla, N., Brusa, R.S., Byakov, V.M., Cabaret, L., Canali, C., Carraro, C., Castelli, F., Cialdi, S., Comparat, D., Consolati, G., Dassa, L., Djourelov, N., Doser, M., Drobychev, G., Dudarev, A., Dupasquier, A., Ferragut, R., Ferrari, G., Fischer, A., Folegati, P., Fontana, A., Formaro, L., Lunardon, M., Gervasini, A., Giammarchi, M.G., Gninenko, S.N., Heyne, R., Hogan, S.D., Jørgensen, L.V., Kellerbauer, A., Krasnicky, D., Lagomarsino, V., Leveraro, F., Manuzio, G., Mariazzi, S., Matveev, V.A., Merkt, F., Moretto, S., Morhard, C., Nebbia, G., Nedelec, P., Oberthaler, M.K., Perini, D., Petracek, V., Prevedelli, M., Al-Qaradawi, I.Y., Quasso, F., Riccardi, C., Rohne, O., Pesente, S., Rotondi, A., Spacek, M., Stapnes, S., Sillou, D., Stepanov, S.V., Stroke, H.H., Testera, G., Tino, G., Trezzi, D., Turbabin, A.V., Vaccarone, R., Vairo, A., Viesti, G., Walters, H., Warring, U., Zavatarelli, S., Zenoni, A., and Zvezhinskij, D.S.

Published
2010
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36. The liquid handling systems for the Borexino solar neutrino detector

Author

Alimonti, G., Arpesella, C., Avanzini, M.B., Back, H., Balata, M., Bartolomei, D., de Bellefon, A., Bellini, G., Benziger, J., Bevilacqua, A., Bondi, D., Bonetti, S., Brigatti, A., Caccianiga, B., Cadonati, L., Calaprice, F., Carraro, C., Cecchet, G., Cereseto, R., Chavarria, A., Chen, M., Chepurnov, A., Cubaiu, A., Czech, W., D’Angelo, D., Dalnoki-Veress, F., Davini, S., De Bari, A., De Haas, E., Derbin, A., Deutsch, M., Di Credico, A., Di Ludovico, A., Di Pietro, G., Eisenstein, R., Elisei, F., Etenko, A., von Feilitzsch, F., Fernholz, R., Fomenko, K., Ford, R., Franco, D., Freudiger, B., Gaertner, N., Galbiati, C., Gatti, F., Gazzana, S., Gehman, V., Giammarchi, M., Giugni, D., Goeger-Neff, M., Goldbrunner, T., Golubchikov, A., Goretti, A., Grieb, C., Guardincerri, E., Hagner, C., Hagner, T., Hampel, W., Harding, E., Hardy, S., Hartmann, F.X., von Hentig, R., Hertrich, T., Heusser, G., Hult, M., Ianni, A., Ianni, An., Ioannucci, L., Jaenner, K., Joyce, M., de Kerret, H., Kidner, S., Kiko, J., Kirsten, T., Kobychev, V., Korga, G., Korschinek, G., Kozlov, Y., Kryn, D., La Marche, P., Lagomarsino, V., Laubenstein, M., Lendvai, C., Leung, M., Lewke, T., Litvinovich, E., Loer, B., Loeser, F., Lombardi, P., Ludhova, L., Machulin, I., Malvezzi, S., Manco, A., Maneira, J., Maneschg, W., Manno, I., Manuzio, D., Manuzio, G., Marchelli, M., Marternianov, A., Masetti, F., Mazzucato, U., McCarty, K., McKinsey, D., Meindl, Q., Meroni, E., Miramonti, L., Misiaszek, M., Montanari, D., Monzani, M.E., Muratova, V., Musico, P., Neder, H., Nelson, A., Niedermeier, L., Nisi, S., Oberauer, L., Obolensky, M., Orsini, M., Ortica, F., Pallavicini, M., Papp, L., Parsells, R., Parmeggiano, S., Parodi, M., Pelliccia, N., Perasso, L., Perasso, S., Pocar, A., Raghavan, R., Ranucci, G., Rau, W., Razeto, A., Resconi, E., Risso, P., Romani, A., Rountree, D., Sabelnikov, A., Saggese, P., Saldanha, R., Salvo, C., Scardaoni, R., Schimizzi, D., Schonert, S., Schubeck, K.H., Shutt, T., Siccardi, F., Simgen, H., Skorokhvatov, M., Smirnov, O., Sonnenschein, A., Soricelli, F., Sotnikov, A., Sukhotin, S., Sule, C., Suvorov, Y., Tarasenkov, V., Tartaglia, R., Testera, G., Vignaud, D., Vitale, S., Vogelaar, R.B., Vyrodov, V., Williams, B., Wojcik, M., Wordel, R., Wurm, M., Zaimidoroga, O., Zavatarelli, S., and Zuzel, G.

Published
2009
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37. The Borexino detector at the Laboratori Nazionali del Gran Sasso

Author

Alimonti, G., Arpesella, C., Back, H., Balata, M., Bartolomei, D., de Bellefon, A., Bellini, G., Benziger, J., Bevilacqua, A., Bondi, D., Bonetti, S., Brigatti, A., Caccianiga, B., Cadonati, L., Calaprice, F., Carraro, C., Cecchet, G., Cereseto, R., Chavarria, A., Chen, M., Chepurnov, A., Cubaiu, A., Czech, W., D’Angelo, D., Dalnoki-Veress, F., De Bari, A., De Haas, E., Derbin, A., Deutsch, M., Di Credico, A., Di Ludovico, A., Di Pietro, G., Eisenstein, R., Elisei, F., Etenko, A., von Feilitzsch, F., Fernholz, R., Fomenko, K., Ford, R., Franco, D., Freudiger, B., Gaertner, N., Galbiati, C., Gatti, F., Gazzana, S., Gehman, V., Giammarchi, M., Giugni, D., Goeger-Neff, M., Goldbrunner, T., Golubchikov, A., Goretti, A., Grieb, C., Hagner, C., Hagner, T., Hampel, W., Harding, E., Hardy, S., Hartmann, F.X., von Hentig, R., Hertrich, T., Heusser, G., Hult, M., Ianni, A., Ianni, An., Ioannucci, L., Jaenner, K., Joyce, M., de Kerret, H., Kidner, S., Kiko, J., Kirsten, T., Kobychev, V., Korga, G., Korschinek, G., Kozlov, Yu., Kryn, D., La Marche, P., Lagomarsino, V., Laubenstein, M., Lendvai, C., Leung, M., Lewke, T., Litvinovich, E., Loer, B., Loeser, F., Lombardi, P., Ludhova, L., Machulin, I., Malvezzi, S., Manco, A., Maneira, J., Maneschg, W., Manno, I., Manuzio, D., Manuzio, G., Marchelli, M., Martemianov, A., Masetti, F., Mazzucato, U., McCarty, K., McKinsey, D., Meindl, Q., Meroni, E., Miramonti, L., Misiaszek, M., Montanari, D., Monzani, M.E., Muratova, V., Musico, P., Neder, H., Nelson, A., Niedermeier, L., Nisi, S., Oberauer, L., Obolensky, M., Orsini, M., Ortica, F., Pallavicini, M., Papp, L., Parcells, R., Parmeggiano, S., Parodi, M., Pelliccia, N., Perasso, L., Pocar, A., Raghavan, R., Ranucci, G., Rau, W., Razeto, A., Resconi, E., Risso, P., Romani, A., Rountree, D., Sabelnikov, A., Saggese, P., Saldhana, R., Salvo, C., Scardaoni, R., Schimizzi, D., Schönert, S., Schubeck, K.H., Shutt, T., Siccardi, F., Simgen, H., Skorokhvatov, M., Smirnov, O., Sonnenschein, A., Soricelli, F., Sotnikov, A., Sukhotin, S., Sule, C., Suvorov, Y., Tarasenkov, V., Tartaglia, R., Testera, G., Vignaud, D., Vitale, S., Vogelaar, R.B., Vyrodov, V., Williams, B., Wojcik, M., Wordel, R., Wurm, M., Zaimidoroga, O., Zavatarelli, S., and Zuzel, G.

Published
2009
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38. Emulsion detectors for the antihydrogen detection in AEgIS

Author

Pistillo, C., Aghion, S., Amsler, C., Ariga, A., Ariga, T., Belov, A., Bonomi, G., Bräunig, P., Bremer, J., Brusa, R., 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., 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, P., Simon, M., Špaček, M., Storey, J., Strojek, I., Subieta, M., Testera, G., Widmann, E., Yzombard, P., Zavatarelli, S., Zmeskal, J., Pistillo, C., Aghion, S., Amsler, C., Ariga, A., Ariga, T., Belov, A., Bonomi, G., Bräunig, P., Bremer, J., Brusa, R., 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., 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, P., Simon, M., Špaček, M., Storey, J., Strojek, I., Subieta, M., Testera, G., Widmann, E., Yzombard, P., Zavatarelli, S., and Zmeskal, J.

Abstract

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
2021

39. Further evidence for low-energy protonium production in vacuum

Author

Lodi Rizzini, E., Venturelli, L., Zurlo, N., Charlton, M., Amsler, C., Bonomi, G., Canali, C., Carraro, C., Fontana, A., Genova, P., Hayano, R., Jørgensen, L. V., Kellerbauer, A., Lagomarsino, V., Landua, R., Macrí, M., Manuzio, G., Montagna, P., Regenfus, C., Rotondi, A., Testera, G., Variola, A., and van der Werf, D. P.

Published
2012
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40. The AEGIS experiment at CERN: Measuring the free fall of antihydrogen

Author

Kellerbauer, A., Allkofer, Y., Amsler, C., Belov, A. S., Bonomi, G., Bräunig, P., Bremer, J., Brusa, R. S., Burghart, G., Cabaret, L., Canali, C., Castelli, F., Chlouba, K., Cialdi, S., Comparat, D., Consolati, G., Dassa, L., Di Noto, L., Donzella, A., Doser, M., Dudarev, A., Eisel, T., Ferragut, R., Ferrari, G., Fontana, A., Genova, P., Giammarchi, M., Gligorova, A., Gninenko, S. N., Haider, S., Hansen, J. P., Haug, F., Hogan, S. D., Jørgensen, L. V., Kaltenbacher, T., Krasnický, D., Lagomarsino, V., Mariazzi, S., Matveev, V. A., Merkt, F., Moia, F., Nebbia, G., Nédélec, P., Niinikoski, T., Oberthaler, M. K., Perini, D., Petráček, V., Prelz, F., Prevedelli, M., Regenfus, C., Riccardi, C., Rochet, J., Røhne, O., Rotondi, A., Sacerdoti, M., Sandaker, H., Špaček, M., Storey, J., Testera, G., Tokareva, A., Trezzi, D., Vaccarone, R., Villa, F., Warring, U., Zavatarelli, S., Zenoni, A., and The AEGIS Collaboration

Published
2012
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43. Proposed antimatter gravity measurement with an antihydrogen beam

Author

Kellerbauer, A., Amoretti, M., Belov, A.S., Bonomi, G., Boscolo, I., Brusa, R.S., Büchner, M., Byakov, V.M., Cabaret, L., Canali, C., Carraro, C., Castelli, F., Cialdi, S., de Combarieu, M., Comparat, D., Consolati, G., Djourelov, N., Doser, M., Drobychev, G., Dupasquier, A., Ferrari, G., Forget, P., Formaro, L., Gervasini, A., Giammarchi, M.G., Gninenko, S.N., Gribakin, G., Hogan, S.D., Jacquey, M., Lagomarsino, V., Manuzio, G., Mariazzi, S., Matveev, V.A., Meier, J.O., Merkt, F., Nedelec, P., Oberthaler, M.K., Pari, P., Prevedelli, M., Quasso, F., Rotondi, A., Sillou, D., Stepanov, S.V., Stroke, H.H., Testera, G., Tino, G.M., Trénec, G., Vairo, A., Vigué, J., Walters, H., Warring, U., Zavatarelli, S., and Zvezhinskij, D.S.

Published
2008
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44. Velocity-selected production of 2S3 metastable positronium

Author

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., Gerber, S., Gligorova, A., Guatieri, F., Hackstock, P., Haider, S., Hinterberger, A., Holmestad, H., Kellerbauer, A., Khalidova, O., Krasnický, D., Lagomarsino, V., Lansonneur, P., Lebrun, P., Malbrunot, C., Mariazzi, S., Matveev, V., Müller, S. R., Nebbia, G., Nedelec, P., Oberthaler, M., 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., 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., Fanì, M., Gerber, S., Gligorova, A., Guatieri, F., Hackstock, P., Haider, S., Hinterberger, A., Holmestad, H., Kellerbauer, A., Khalidova, O., Krasnický, D., Lagomarsino, V., Lansonneur, P., Lebrun, P., Malbrunot, C., Mariazzi, S., Matveev, V., Müller, S. R., Nebbia, G., Nedelec, P., Oberthaler, M., 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., and Zurlo, N.

Subjects
positronium, antihydrogen
Abstract

Positronium in the 2 3 S 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 3 S positronium is produced, in the absence of an electric field, via spontaneous radiative decay from the 3 3 P level populated with a 205-nm 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 nanochanneled positron-positronium converter were selected by delaying the excitation pulse with respect to the production instant. 2 3 S positronium atoms with velocity tuned between 7 × 10 4 ms −1 and 10 × 10 4 ms −1 were thus produced. Depending on the selected velocity, a 2 3 S production efficiency ranging from ∼0.8% to ∼1.7%, with respect to the total amount of emitted positronium, was obtained. The observed results give a branching ratio for the 3 3 P-2 3 S spontaneous decay of (9.7 ± 2.7)%. The present velocity selection technique could allow one to produce an almost monochromatic beam of ∼1 × 10 3 2 3 S atoms with a velocity spread of

Published
2019

45. Probing antimatter gravity – The AEGIS experiment at CERN

Author

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., and Zurlo N.

Subjects
Physics, QC1-999
Abstract

The weak equivalence principle states that the motion of a body in a gravitational field is independent of its structure or composition. This postulate of general relativity has been tested to very high precision with ordinary matter, but no relevant experimental verification with antimatter has ever been carried out. The AEGIS experiment will measure the gravitational acceleration of antihydrogen to ultimately 1% precision. For this purpose, a pulsed horizontal antihydrogen beam with a velocity of several 100 m s−1 will be produced. Its vertical deflection due to gravity will be detected by a setup consisting of material gratings coupled with a position-sensitive detector, operating as a moiré deflectometer or an atom interferometer. The AEGIS experiment is installed at CERN’s Antiproton Decelerator, currently the only facility in the world which produces copious amounts of low-energy antiprotons. The construction of the setup has been going on since 2010 and is nearing completion. A proof-of-principle experiment with antiprotons has demonstrated that the deflection of antiparticles by a few μm due to an external force can be detected. Technological and scientific development pertaining to specific challenges of the experiment, such as antihydrogen formation by positronium charge exchange or the position-sensitive detection of antihydrogen annihilations, is ongoing.

Published
2016
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46. Protocol for pulsed antihydrogen production in the AE$\overline{g}$IS apparatus

Author

Tietje, I.C., Amsler, C., Antonello, M., Belov, A., Bonomi, G., Brusa, R.S., Caccia, M., Camper, A., Caravita, R., Castelli, F., Cheinet, P., Comparat, D., Consolati, G., Demetrio, A., Noto, L.Di, Doser, M., Fanì, M., Ferragut, R., Fesel, J., Gerber, S., Giammarchi, M., Gligorova, A., Glöggler, L.T., Guatieri, F., Haider, S., Hinterberger, A., Kellerbauer, A., Khalidova, O., Krasnický, D., Lagomarsino, V., Malbrunot, C., Nowak, L., Mariazzi, S., Matveev, V., Müller, S.R., Nebbia, G., Nedelec, P., Oberthaler, M., Oswald, E., Pagano, D., Penasa, L., Petracek, V., Povolo, L., Prelz, F., Prevedelli, M., Rienäcker, B., Røhne, O.M., Rotondi, A., Sandaker, H., Santoro, R., Testera, G., Toso, V., 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 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), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)

Subjects
velocity, experimental methods, antihydrogen: production, deflection, gravitation: acceleration, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], beam: pulsed, anti-p: acceleration, time-of-flight, talk, anti-p p: annihilation, antihydrogen: acceleration, Particle Physics - Experiment
Abstract

International audience; The AEḡIS collaboration’s main goal is to measure the acceleration of antihydrogen it ($\textit{H}$) due to gravity. The experimental scheme is to form a pulsed beam whose vertical deflection is then measured by means of a moiré deflectometer [1]. Creating pulsed $\textit{H}$is crucial since it allows a velocity measurement of the antiatoms via time of flight ($\mathrm{ToF}$) necessary to deduce the gravitational acceleration ḡ from the vertical deflection $\Delta\mathit{s}$. The aim of this article is to outline the experimental protocol leading up to pulsed antihydrogen production in the AEḡIS experiment.

Published
2020

47. Protonium production in ATHENA

Author

Venturelli, L., Amoretti, M., Amsler, C., Bonomi, G., Carraro, C., Cesar, C.L., Charlton, M., Doser, M., Fontana, A., Funakoshi, R., Genova, P., Hayano, R.S., Jørgensen, L.V., Kellerbauer, A., Lagomarsino, V., Landua, R., Rizzini, E. Lodi, Macrì, M., Madsen, N., Manuzio, G., Mitchard, D., Montagna, P., Posada, L.G., Pruys, H., Regenfus, C., Rotondi, A., Testera, G., Van der Werf, D.P., Variola, A., Yamazaki, Y., and Zurlo, N.

Published
2007
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48. Production of slow protonium in vacuum

Author

Zurlo, N., Amoretti, M., Amsler, C., Bonomi, G., Carraro, C., Cesar, C. L., Charlton, M., Doser, M., Fontana, A., Funakoshi, R., Genova, P., Hayano, R. S., Jørgensen, L. V., Kellerbauer, A., Lagomarsino, V., Landua, R., Lodi Rizzini, E., Macrì, M., Madsen, N., Manuzio, G., Mitchard, D., Montagna, P., Posada, L. G., Pruys, H., Regenfus, C., Rotondi, A., Testera, G., Van der Werf, D. P., Variola, A., Venturelli, L., and Yamazaki, Y.

Published
2006
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49. Production and detection of cold antihydrogen atoms

Author

Amoretti, M., Amsler, C., Bonomi, G., Bouchta, A., Bowe, P., Carraro, C., Cesar, C. L., Charlton, M., Collier, M. J. T., Doser, M., Filippini, V., Fine, K. S., Fontana, A., Fujiwara, M. C., Funakoshi, R., Genova, P., Hangst, J. S., Hayano, R. S., Holzscheiter, M. H., Jørgensen, L. V., Lagomarsino, V., Landua, R., Lindelöf, D., Rizzini, E. Lodi, Macrì, M., Madsen, N., Manuzio, G., Marchesotti, M., Montagna, P., Pruys, H., Regenfus, C., Riedler, P., Rochet, J., Rotondi, A., Rouleau, G., Testera, G., Variola, A., Watson, T. L., and van der Werf, D. P.

Published
2002
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