Paper

Real-time antiproton annihilation vertexing with sub-micron resolution

Pospisil, S, Prelz, F, Pandey, P, Guatieri, F, Krumins, V, Zawada, M, Kasprowicz, G, Sandaker, H, Piwiński, M, Castelli, F, Giszczak, A, Orsucci, D, Brusa, R S, Auzins, M, Germann, M, Vafeiadis, T, Cerchiari, G, Mariazzi, S, Linek, A, Burian, P, Hugenschmidt, C, Moskal, P, Rauschendorfer, T, Volponi, M, Ferguson, R, Sowiński, T, Eliaszuk, K, Consolati, G, Kłosowski, Ł, Graczykowski, Ł, Glöggler, L T, Sharma, S, Doser, M, Petracek, V, Rangwala, S A, Rodin, V, Januszek, T, Nowicka, D, Lappo, L, Gusakova, N, Welsch, C P, Smolyanskiy, P, Kornakov, G, Camper, A, Khatri, G, Kempny, K, Pęcak, D, Røhne, O M, Caravita, R, Chehaimi, A, Alfaro, S, Huck, S, Tefelski, D, Janik, M A, Penasa, L, Rawat, B S, Povolo, L, Grosbart, M, Zurlo, N, Rienäcker, B, Bergmann, B, Zielinski, J, Berghold, M, Gustafsson, F, Haider, S, Ciuryło, R

2024

Overview

The primary goal of the AEgIS experiment is to precisely measure the free fall of antihydrogen within Earth's gravitational field. To this end, a cold ~50K antihydrogen beam has to pass through two grids forming a moiré deflectometer before annihilating onto a position-sensitive detector, which shall determine the vertical position of the annihilation vertex relative to the grids with micrometric accuracy. Here we introduce a vertexing detector based on a modified mobile camera sensor and experimentally demonstrate that it can measure the position of antiproton annihilations with an accuracy of \\(0.62^{+0.40}_{-0.22}\\mu m\\), which represents a 35-fold improvement over the previous state-of-the-art for real-time antiproton vertexing. Importantly, these antiproton detection methods are directly applicable to antihydrogen. Moreover, the sensitivity to light of the sensor enables the in-situ calibration of the moiré deflectometer, significantly reducing systematic errors. This sensor emerges as a breakthrough technology for achieving the \\aegis scientific goals and has been selected as the basis for the development of a large-area detector for conducting antihydrogen gravity measurements.

• Publisher: Cornell University Library, arXiv.org
• Subject: Antihydrogen / Antiparticles / Antiprotons / Deflectometers / Earth gravitation / Error reduction / Free fall / Gravitational fields / Position measurement / Position sensing / Real time / Sensors / Systematic errors / Vertical orientation