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Development of a detector for inertial sensing of positronium at AEḡIS (CERN)

Glöggler, Lisa T.; Caravita, R.; Bergmann, B.; Bonomi, G.; Brusa, R. S.; Burian, P.; Camper, A.; Castelli, F.; Cheinet, P.; Comparat, D.; Consolati, G.; Doser, M.; Gjersdal, H.; Graczykowski, Ł.; Guatieri, F.; Haider, S.; Huck, S.; Janik, M.; Kasprowicz, G.; Khatri, G.; Kornakov, G.; Malbrunot, C.; Mariazzi, S.; Nebbia, G.; Nowak, L.; Nowicka, D.; Oswald, E.; Pagano, D.; Penasa, L.; Pospisil, S.; Povolo, L.; Prelz, F.; Rienäcker, B.; Røhne, O. M.; Sandaker, H.; Stekl, I.; Tefelski, D.; Tietje, I. C.; Volponi, M.; Wolz, T.; Zimmer, C.; Zurlo, N.; ,

FG Nichtlineare Optik

The primary goal of the AEgIS collaboration at CERN is to measure the gravitational acceleration on neutral antimatter. Positronium (Ps), the bound state of an electron and a positron, is a suitable candidate for a force-sensitive inertial measurement by means of deflectometry/interferometry. In order to conduct such an experiment, the impact position and time of arrival of Ps atoms at the detector must be detected simultaneously. The detection of a low-velocity Ps beam with a spatial resolution of (88 ± 5) μm was previously demonstrated [1]. Based on the methodology employed in [1] and [2], a hybrid imaging/timing detector with increased spatial resolution of about 10 μm was developed. The performance of a prototype was tested with a positron beam. The concept of the detector and first results are presented.