Speaker
Description
The primary goal of the AEgIS experiment is to measure the gravitational acceleration on antimatter by means of deflectometry/interferometry. This requires the simultaneous detection of the impact position and time of arrival of the atoms at a detector with high resolution. The detection of a low-velocity positronium (Ps) beam with (88 ± 5) µm spatial resolution was demonstrated [1]. Based on this methodology, a hybrid imaging/timing detector with increased spatial resolution was developed. The detection scheme is based on field-ionization of the Ps atoms, followed by the imaging of the ionization products by a microchannel plate (MCP). The read out of the MCP with a TimePix3 chip provides time resolution on a ns-scale. Sub-pixel resolution is achieved by applying an event centroiding algorithm. The concept of the detector is presented in detail and results of first performance tests are shown.
[1] C. Amsler et al., Nuclear Instr. and Methods in Physics Research B 457 (2019) 44-48
