Journal Article

GSI-2026-00001

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Impact of trace amounts of water on the stability of Micro-Pattern Gaseous Detectors measured in $Ar-CO_{2}$ (90-10)

Fribert, H. (Corresponding author) ; Fabbietti, L. ; Gasik, P.GSI* ; Ulukutlu, B.

2026
Elsevier [Amsterdam]

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Please use a persistent id in citations: doi:10.1016/j.nima.2025.170912  doi:10.15120/GSI-2026-00001

Report No.: arXiv:2503.03012

Abstract: In this study, we investigate the influence of humidity on the performance of various non-resistive Micro Pattern Gaseous Detectors, such as GEM, Thick-GEM, and Micromegas, operated with Ar-CO2 (90-10) gas mixture. The water content is introduced in a range of 0-5000 ppmV. It is observed that the presence of increased humidity does not significantly 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. No significant difference is observed at the lower gains, indicating that humidity helps to reduce the rate of spurious discharges related to electrode defects or charging-up of the insulating layers. We conclude that adding a small amount of water to the gas mixture may be beneficial for the stable operation of an MPGD.

Note: This work was supported by the Deutsche Forschungsgemeinschaft - Sachbeihilfe [grant number DFG FA 898/5-1]. This is an open access article under the CC BY license ( http://creativecommons.org/licenses/by/4.0/

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Contributing Institute(s):

1. CBM (CBM)
2. Forschungskoordination (FRC)

Research Program(s):

1. 622 - Detector Technologies and Systems (POF4-622) (POF4-622)

Experiment(s):

1. External experiment at external facility/ no experiment at GSI (other)

Appears in the scientific report 2026

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Database coverage:
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