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HK: Fachverband Physik der Hadronen und Kerne

HK 23: Poster

HK 23.6: Poster

Dienstag, 11. März 2025, 17:30–19:00, Foyer Physik

Amplitude Measurements with ALICE ITS3 MAPS Detectors — •Henrik Fribert, Berkin Ulukutlu, Roman Gernhäuser, and Laura Fabbietti for the ALICE Germany collaboration — TUM School of Natural Sciences, Technische Universität München, Munich, Germany

Monolithic Active Pixel Sensors (MAPS) are becoming increasingly important in future particle physics experiments due to their ease of integration, high spatial resolution, and low material budget. While MAPS have mostly been used for tracking where only binary hit information is stored, measuring signal amplitude could enable particle identification (PID) and enhance tracking capabilities. In this contribution, the feasibility of amplitude measurements using two promising techniques is assessed: time-encoded Time-over-Threshold (ToT), where pixels send a pulse at a signal's rising and falling edge to measure the ToT, and digital oversampling, which samples the signal multiple times above threshold. The methods were tested on two prototype sensors developed for the ALICE ITS3 upgrade: the Digital Pixel Test Structure chiplet (DPTS) and the larger babyMOSS sensor. Additionally, Geant4 simulations are carried out to assess the achievable PID performance of these methods in large-scale detectors. This research was supported by the Excellence Cluster ORIGINS funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy EXC-2094390783311 and the DFG through the Grant SFB 1258 "Neutrinos and Dark Matter in Astro and Particle Physics".

Keywords: Silicon detectors; Pixel sensors; MAPS; Particle identification