SMuK 2021 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 13: Instrumentation V
HK 13.6: Talk
Tuesday, August 31, 2021, 18:00–18:15, H2
Performance Studies of Micromegas based Detectors — •Tobias Waldmann1, Rossana Facen1, Berkin Ulukutlu1, Piotr Gasik2, and Laura Fabbietti1 — 1Technische Universität München — 2GSI Helmholtzzentrum
Micro Mesh Gaseous Structures (Micromegas) and Gas Electron Multipliers (GEM) are detectors implemented in a wide range of modern particle physics experiments. Among their major advantages are high achievable gains, good energy resolution and intrinsic ion backflow suppression. One method to improve their performance even further is to stack a Micromegas and a GEM. Still, a huge limiting factor to the performance is the formation of electrical discharges between the electrodes, which can eventually blind or permanently damage the involved detector components. Therefore, the limits of safe operation of such detectors need to be studied in detail. In our studies we, hence, investigated the performance of a Micromegas and a GEM + Micromegas detector. Firstly, we performed scans of the various parameters contributing to the detector performance, including the applied electric fields and the geometry of its components. Here, a special focus was put on ion backflow reduction and energy resolution optimization. Optimal working regions with respect to a set of boundary parameters can thus be defined. Secondly, we investigated the discharge stability of the two detectors, which provides further limits for the safe working regions.