Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 16: Instrumentation VI
HK 16.3: Vortrag
Montag, 28. März 2022, 16:30–16:45, HK-H5
Impact of the gas choice and the geometry on the breakdown limit in (TH)GEM-based detectors — •Lukas Lautner1,2, Piotr Gasik3, Andreas Mathis1, Laura Fabbietti1, Tobias Waldmann1, Berkin Ulukutlu1, and Thomas Klemenz1 — 1Physik Department, Technische Universität München — 2CERN — 3GSI - Helmholtzzentrum fur Schwerionenforschung GmbH
In this study we investigate the intrinsic stability limits of Gas Electron Multiplier (GEM) and Thick GEM detectors upon irradiation with alpha particles. The measurements are performed in Ar- and Ne- based mixtures with different CO2 content to study the influence of the gas on discharge probability and critical charge limits. The latter are obtained by comparing the experimental data to results obtained within a Geant4 simulation framework. The measurements provide a direct comparison between GEMs and THGEMs and allow us to evaluate the influence of geometrical parameters, such as hole size, pitch and (TH)GEM thickness, on the stability of a structure and the resulting critical charge value. We observe that the breakdown limit is strongly dependent on the gas, and that the amount of quencher in the mixture does not necessarily correlate with higher stability. The outcome of these studies is of particular interest for currently running or planned photon and hadron-blind detectors based on THGEM technology as well as cryogenic applications.