SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 45: Instrumentation XIII

HK 45.4: Vortrag

Mittwoch, 22. März 2023, 18:15–18:30, SCH/A.101

Studying the Impact of Humidity on the Performance of MPGDs — •Henrik Fribert¹, Piotr Gasik², Berkin Ulukutlu¹, and Laura Fabbietti¹ — ¹Technische Universität München, Garching, Germany — ²FAIR/GSI GmbH, Darmstadt, Germany

MPGDs (Micro-Pattern Gaseous Detectors) are gaseous detectors used in high-energy physics experiments like ALICE or ATLAS at the LHC. Despite 30 years long experience in the production and successful operation of this type of detector, the effect of water contamination of the gas composition on their performance is still a subject of debate. We contribute to this topic with systematic studies using several MPGDs (GEMs, THGEMs, and Micromegas) operated with an Ar-CO2 mixture and introducing water content in a range of 0-5000 ppmV. Detector performance is evaluated while varying the humidity level for each type of MPGD under study. The water is introduced to the detector vessel by incorporating a water-filled bubbler into the gas system, through which gas can be flushed at different rates. It is observed that the presence of increased humidity does not degrade any of the studied performance criteria. On the contrary, our measurements suggest an improvement in discharge stability with increasing humidity levels, at the highest gains and fields. We conclude, that adding a small amount of water to the gas mixture may be beneficial for the stable operation of an MPGD. This work is funded by the BMBF Verbundforschung (05P21WOCA1 ALICE) and the DFG Sachmittel FA 898/5-1.