Gießen 2024 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 39: Instrumentation IX

HK 39.3: Talk

Wednesday, March 13, 2024, 16:30–16:45, HBR 19: C 1

Characterizing Cluster Behavior and Alignment Strategies in Cylindrical MAPS Detectors for ALICE at the LHC — •Berkin Ulukutlu — Technische Universität München, Munich, Germany

The ALICE experiment at CERN is upgrading its Inner Tracking System (ITS) to ITS3, replacing tracking layers with wafer-scale, cylindrically bent MAPS chips. This innovation significantly reduces material, enhancing vertexing resolution. Extensive R&D addresses challenges with this unique geometry. The ITS3, a miniature telescope with five bent ALPIDE chips, underwent testing at the Bronowice Cyclotron Center. This experiment assessed bent detectors with 80, 120, and 200 MeV protons, investigating cluster size response from highly ionizing particles. Alignment strategies, including novel machine learning approaches, were extensively investigated. The aligned detector achieved a vertexing resolution near 50 micrometers, nearing the lower limit due to scattering effects. The research was funded by the DFG Sachmittel FA 898/5-1

Keywords: Monolithic Active Pixel Detectors (MAPS); Bent detectors; Detector Alignment; Machine Learning; Vertexing