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T: Fachverband Teilchenphysik

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

T 107.6: Vortrag

Freitag, 3. April 2020, 12:15–12:30, J-HS C

Modelling of discharge in parallel-plate-type Micro-Pattern gaseous detectors — •Deb Sankar Bhattacharya, Raimund Ströhmer, and Thomas Trefzger — University of Wüzburg, Physik und ihre Didaktik, Emil-Hilb-Weg 22, 97074, Germany

The Micro-Pattern Gaseous Detectors (MPGD) have been widely adopted in nuclear and particle physics experiments, for their fast response and other excellent characteristics. To achieve the required signal strength and detection efficiency, sometimes they are operated at a high voltage range. This often challenges the limit of high voltage stability of the detector. Discharge in gaseous detectors is a complex process and there are several factors which may directly or indirectly influence. The microscopic geometrical structures of the MPGDs may itself sometimes induce discharges. In this study, we are numerically investigating the discharge phenomena in non-resistive Micromegas. Within the COMSOL framework, a 3-dimensional model is developed to observe the occurrence and the development of discharge in Micromegas. The effect of space charge has been taken into account in the calculation. The model allows to vary the geometrical parameters of the detector as well as to study the effects of gas impurities and a different number of primary charges.