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T: Fachverband Teilchenphysik

T 95: Gaseous Detectors III

T 95.3: Talk

Friday, March 20, 2026, 09:30–09:45, KH 01.014

Testbeam Performance of 20x20 cm² triple GEM Detector — •Nick Schneider, Otmar Biebel, Valerio D’Amico, Ralf Hertenberger, Eshita Kumar, Lilla Schneider, Chrysostomos Valderanis, and Fabian Voggel — LMU Munich

Micro-Pattern Gaseous Detectors are heavily used for the detection of charged particles with excellent temporal and spatial resolution. The investigated detector is a triple-GEM detector with a size of 20x20 cm². Additionally the GEM-foils are split into 4 sectors on the top sides to reduce the capacity in case of a violent discharge, making it less likely for the foils to be damaged in such an event. While testing the detector in the lab with a ⁵⁵Fe source a charge-up effect was noticed. To further investigate this effect and determine efficiency and resolution of this detector it is tested in a 120 GeV muon testbeam at CERN and a high-rate ≈3 GeV electron testbeam at ELSA (University of Bonn). For the muon testbeam additional tracking detectors are used to determine the efficiency and the resolution of detector under test. Due to multiple scattering, it is very difficult to track the particles in the electron testbeam. Consequently, the high electron flux of this beam is used to further investigate high-rate and charge-up effects. Some of the results of these testbeams will be presented.

Keywords: MPGD; GEM; Testbeam