SMuK 2021 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 3: Instrumentation I
HK 3.4: Vortrag
Montag, 30. August 2021, 17:30–17:45, H2
Characterizing new (TH)GEM coating materials using spectroscopy methods — •Berkin Ulukutlu1, Piotr Gasik2, Tobias Waldmann1, Lukas Lautner1, and Laura Fabbietti1 — 1Technische Universität München — 2GSI Helmholtzzentrum für Schwerionenforschung
Gas Electron Multiplier (GEM) has become a commonly employed technology for modern high-rate particle and nuclear physics experiments. Nonetheless, one of the key limitations to the long-term sustainability of these devices are electrical discharges which might occur during high gain operation. Discharge events lead to dead-times and can even result in irreparable damage on the detector components, therefore, there has been extensive research aiming to develop methods to mitigate or subdue such events. This effort has yielded great success and enabled the development of very reliable and stable instruments. However, there are still major unanswered questions remaining concerning the fundamental mechanisms leading to the formation of electrical discharges in GEMs. In our studies, we investigated discharge formation in GEMs and Thick-GEMs (THGEM) produced with various conductive layer materials replacing the standard copper with aluminium, molybdenum, tantalum, and tungsten. Moreover, we employed optical spectroscopy to study the light emitted from such discharges as a probe to analyze the material content of the formed plasma. The measurements provide new insight into the mechanism of the secondary discharge creation.