We characterized the pulsed Rydberg-positronium production inside the Antimatter Experiment: Gravity, Interferometry, Spectroscopy (AEgIS) apparatus in view of antihydrogen formation by means of a charge exchange reaction between cold antiprotons and slow Rydberg-positronium atoms. Velocity measurements on the positronium along two axes in a cryogenic environment (≈10K) and in 1 T magnetic field were performed. The velocimetry was done by microchannel-plate (MCP) imaging of a photoionized positronium previously excited to the n 3 state. One direction of velocity was measured via Doppler scan of this n = 3 line, another direction perpendicular to the former by delaying the exciting laser pulses in a time-of-flight measurement. Self-ionization in the magnetic field due to the motional Stark effect was also quantified by using the same MCP-imaging technique for Rydberg positronium with an effective principal quantum number neff 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.
Rydberg-positronium velocity and self-ionization studies in a 1T magnetic field and cryogenic environment / M. Antonello, A. Belov, G. Bonomi, R.S. Brusa, M. Caccia, A. Camper, R. Caravita, F. Castelli, D. Comparat, G. Consolati, L. Di Noto, M. Doser, M. Fanì, R. Ferragut, J. Fesel, S. Gerber, A. Gligorova, L.T. Glöggler, F. Guatieri, S. Haider, A. Hinterberger, O. Khalidova, D. Krasnický, V. Lagomarsino, C. Malbrunot, S. Mariazzi, V. Matveev, S.R. Müller, G. Nebbia, P. Nedelec, L. Nowak, M. Oberthaler, E. Oswald, D. Pagano, L. Penasa, V. Petracek, F. Prelz, B. Rienäcker, O.M. Røhne, A. Rotondi, H. Sandaker, R. Santoro, G. Testera, I.C. Tietje, T. Wolz, C. Zimmer, N. Zurlo. - In: PHYSICAL REVIEW A. - ISSN 2469-9926. - 102:1(2020 Jul), pp. 013101.1-013101.10.
Rydberg-positronium velocity and self-ionization studies in a 1T magnetic field and cryogenic environment
F. Castelli;F. Prelz;
2020
Abstract
We characterized the pulsed Rydberg-positronium production inside the Antimatter Experiment: Gravity, Interferometry, Spectroscopy (AEgIS) apparatus in view of antihydrogen formation by means of a charge exchange reaction between cold antiprotons and slow Rydberg-positronium atoms. Velocity measurements on the positronium along two axes in a cryogenic environment (≈10K) and in 1 T magnetic field were performed. The velocimetry was done by microchannel-plate (MCP) imaging of a photoionized positronium previously excited to the n 3 state. One direction of velocity was measured via Doppler scan of this n = 3 line, another direction perpendicular to the former by delaying the exciting laser pulses in a time-of-flight measurement. Self-ionization in the magnetic field due to the motional Stark effect was also quantified by using the same MCP-imaging technique for Rydberg positronium with an effective principal quantum number neff 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.
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