Köln 2025 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 36: Instrumentation VIII

HK 36.5: Talk

Wednesday, March 12, 2025, 18:45–19:00, SR Exp1A Chemie

Investigating bent MAPS sensors — •Berkin Ulukutlu for the ALICE Germany collaboration — Technische Universität München, Munich, Germany

The ALICE experiment at CERN is upgrading its Inner Tracking System (ITS) as part of the ITS3 project, which replaces the innermost tracking layers with wafer-scale, cylindrically bent Monolithic Active Pixel Sensors (MAPS). The implementation of bent silicon detectors at this scale is unprecedented and requires extensive R&D to address challenges associated with the geometry. This presentation will focus on studies of the effects of bending on sensor performance, carried out using bent ALPIDE sensors currently deployed in the ITS2. Laboratory and test beam measurements confirm that sensor bending does not degrade tracking performance. Studies of charge-sharing behavior and alignment strategies further support the feasibility of using bent detectors in high-energy and nuclear physics applications. Furthermore, the ongoing development of a beam telescope featuring babyMOSS sensors, prototype sensors produced for ITS3 in 65 nm technology, in a bent configuration, will also be presented.

This research was supported by the Excellence Cluster ORIGINS funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany*s Excellence Strategy EXC-2094-390783311 and the DFG through the Grant SFB 1258 *Neutrinos and Dark Matter in Astro and Particle Physics*.

Keywords: CMOS MAPS; Bent sensors; Vertex detector; Silicon tracker