Köln 2025 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 36: Instrumentation VIII

HK 36.2: Talk

Wednesday, March 12, 2025, 18:00–18:15, SR Exp1A Chemie

Silicon Semiconductor Detectors: DPTS and BabyMOSS — •Tim Stellhorn — Institut für Kernphysik, Münster

In my talk, I will shortly present two different types of Monolithic Active Pixel Sensors (MAPS): the Digital Pixel Test Structure (DPTS) and the Monolithic Stitched Sensor (MOSS). Both serve as prototypes for an upgrade of the Inner Tracking System (ITS) in the ALICE detector. In this upgrade, silicon sensors with a thickness of 50 µm and a surface of 26· 10 cm² will be produced by applying the stitching technology. With this thinness, it is possible to bend the sensors into a truly cylindrical shape with a distance of 2 mm around the beam pipe. This will improve the tracking efficiency and pointing resolution of ALICE.

I will discuss different properties such as the efficiency and the fake-hit-rate of both prototypes under various settings as well as the possibilities for particle identification with the DPTS chip. Furthermore, I will present results of testbeams performed with a babyMOSS telescope at PS at CERN and at ELSA in Bonn.

Keywords: Silicon pixel detector; ALICE ITS3; MAPS; DPTS; BabyMOSS