Forming a pulsed beam of cold antihydrogen using charge-exchange with Rydberg positronium (Ps) is the goal of the AE?IS collaboration, which aims to a first gravity measurement on neutral antimatter. Recently achieved results in Ps formation and laser spectroscopy in the main AE?IS apparatus are summarized. First, Ps has been produced using nanochanneled silicon targets in a cryogenic environment (~ 15 K) with 1 T magnetic field and observed by means of Single-Shot Positron Annihilation Lifetime Spectroscopy. The first demonstration of Ps n=3 excitation has been obtained as well using the same technique, validating the proof-of-concept of AEgIS. Subsequently, a new fast and high sensitivity detection method for laser-excited Ps in high magnetic field has been developed, using the combination of laser/field ionization and an high sensitivity MCP detector coupled to a low-noise CMOS camera. This technique will form the basis of future experiments involving Rydberg Ps spectroscopy in AE?IS.
Positronium Rydberg excitation diagnostic in a 1T cryogenic environment / R. Caravita, S. Mariazzi, S. Aghion, C. Amsler, M. Antonello, A. Belov, G. Bonomi, R.S. Brusa, M. Caccia, A. Camper, F. Castelli, G. Cerchiari, D. Comparat, G. Consolati, A. Demetrio, L. Di Noto, M. Doser, C. Evans, M. Fani, R. Ferragut, J. Fesel, A. Fontana, S. Gerber, M. Giammarchi, A. Gligorova, F. Guatieri, P. Hackstock, S. Haider, A. Hinterberger, H. Holmestad, A. Kellerbauer, O. Khalidova, D. Krasnicky, V. Lagomarsino, P. Lansonneur, P. Lebrun, C. Malbrunot, J. Marton, V. Matveev, S.R. Muller, G. Nebbia, P. Nedelec, M. Oberthaler, D. Pagano, L. Penasa, V. Petracek, F. Prelz, M. Prevedelli, B. Rienaecker, J. Robert, O.M. Rohne, A. Rotondi, H. Sandaker, R. Santoro, L. Smestad, F. Sorrentino, G. Testera, I.C. Tietje, M. Vujanovic, E. Widmann, P. Yzombard, C. Zimmer, J. Zmeskal, N. Zurlo (AIP CONFERENCE PROCEEDINGS). - In: Positron Annihilation Spectroscopy-Fundamentals, Techniques ad Applications / [a cura di] F. Selim. - [s.l] : AIP, 2019. - ISBN 9780735419292. - pp. 030002-1-030002-6 (( Intervento presentato al 15. convegno International Conference on Positron Annihilation: Positron Annihilation Spectroscopy-Fundamentals, Techniques ad Applications tenutosi a Orlando nel 2018 [10.1063/1.5135825].
Positronium Rydberg excitation diagnostic in a 1T cryogenic environment
F. Castelli;M. Giammarchi;F. Prelz;
2019
Abstract
Forming a pulsed beam of cold antihydrogen using charge-exchange with Rydberg positronium (Ps) is the goal of the AE?IS collaboration, which aims to a first gravity measurement on neutral antimatter. Recently achieved results in Ps formation and laser spectroscopy in the main AE?IS apparatus are summarized. First, Ps has been produced using nanochanneled silicon targets in a cryogenic environment (~ 15 K) with 1 T magnetic field and observed by means of Single-Shot Positron Annihilation Lifetime Spectroscopy. The first demonstration of Ps n=3 excitation has been obtained as well using the same technique, validating the proof-of-concept of AEgIS. Subsequently, a new fast and high sensitivity detection method for laser-excited Ps in high magnetic field has been developed, using the combination of laser/field ionization and an high sensitivity MCP detector coupled to a low-noise CMOS camera. This technique will form the basis of future experiments involving Rydberg Ps spectroscopy in AE?IS.
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