Erlangen 2026 – scientific programme

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T: Fachverband Teilchenphysik

T 95: Gaseous Detectors III

T 95.4: Talk

Friday, March 20, 2026, 09:45–10:00, KH 01.014

Rate characteristics of triple GEM detectors with results from the ELSA testbeam measurements — Erik Ehlert, Kerstin Hoepfner, Stella Israel, •Daniel Klee, Markus Merschmeyer, Alexander Schmidt, and Shawn Zaleski — III. Physikalisches Institut, RWTH Aachen University, Aachen, Germany

Gas electron multipliers (GEM detectors) are often used in challenging conditions. For example in the CMS experiment the new ME0 detector will see particle-fluxes of up to 150 kHz/cm². For a muon detector it is not trivial to cope with such high rates. GEM detectors are particularly well suited for this environment because of their high rate capability and good spatial resolution. This talk will present results on studies of operating a GEM detector at high and highest rates. In particular, we present the influence of boundary conditions, such as variation of protection resistors. Besides measuring the rate capability of a triple GEM test detector with an X-Ray source, the presented results also include measurements recorded at the Elektronen-Stretcher-Anlage (ELSA) in Bonn. Here we were able to reach even higher rates, pushing the GEM detector to its limits.

Keywords: GEM; Rate-capability; CMS; Muon