Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 107: Combined instrumentation session I: Gaseous detectors (joint session HK/T)

T 107.1: Talk

Friday, April 3, 2020, 11:00–11:15, J-HS C

Study of gas gain in GEM detectors — •Henning Keller, Thomas Hebbeker, Kerstin Hoepfner, Giovanni Mocellin, and Shawn Zaleski — III. Physikalisches Institut A, RWTH Aachen University

The Gas Electron Multiplier (GEM) technology is quite popular among the gaseous detector community due to the excellent performance, even in high-rate environments; it has strong resistance to aging as well as a flexible design. The heart of the detector consists of GEM foils with an etched hexagonal pattern of holes. The detection principle relies on electron multiplictation inside the holes, where a high electric field is apparent. GEM detectors are currently being installed in the CMS Muon system at the LHC in preparation for Run-3. New etching techniques have been used for the production of large-size (O(1 m²)) GEM foils needed for CMS. The new techniques result in different hole geometries inside the GEM foil. In order to better understand the gas gain dependance on the hole geometry, several measurements have been performed, and have been complemented by GARFIELD++ simulations. The findings are compared with other recent studies.