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T: Fachverband Teilchenphysik
T 64: Detectors 7 (gas detectors)
T 64.6: Talk
Wednesday, March 6, 2024, 17:15–17:30, Geb. 30.23: 2/17
The Influence of Combined Oxygen and Water Impurities on Measurements with a MicroMegas Detector filled with an Ar-CO2 Gas Mixture — •Burkhard Böhm and Raimund Ströhmer — Universität Würzburg, Germany
In particle physics, Micro-Pattern Gaseous Detectors (MPGD) find high usage in different experiments like ATLAS, CMS or ALICE. In this study MicroMegas Detectors (MM) - a special type of MPGDs - are researched in terms of combined contamination from H2O and O2. These detectors are well known for their simple single-stage amplification, high and stable gain and excellent spatial and temporal resolutions. Gas systems are rarely perfectly tight and can be contaminated by H2O or O2 from ambient air. The effect of H2O impurities on measurement results was researched to be very small while O2 concentration can significantly effect the results. As processes in 3 or more component gases are complex, studying the behaviour of the combination O2 and H2O in an Argon atmosphere experimentally is very useful. By precisely controlled inflowing of O2 and humid Ar-CO2 inside a resistive MM chamber, the effect on the gas-gain, mainly due to attachment in the drift region, and the amplification of the number of primary electrons are studied. In parallel to the experimental study numerical investigations were done to explore the parameter space of the amplification gap of the MM detector.
Keywords: Micro-Pattern Gaseous Detectors (MPGD); Micromegas; Gas-System; Oxygen; Water