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T: Fachverband Teilchenphysik

T 19: Myondetektoren

T 19.7: Vortrag

Montag, 25. März 2019, 17:35–17:50, ST 3

Effects of humidity on the gas gain in MicroMegas detectors — •Thorwald Klapdor-Kleingrothaus — Universität Freiburg

The Micro-Mesh-Gaseous Detectors (MicroMegas) are planar and high-rate capable detectors with a high spatial resolution of ∼100µm. In the recent years, the MM technology was intensively studied to replace the innermost station of the ATLAS endcap muon spectrometer. The new detector assembly is known as the New Small Wheel Upgrade and will be installed in the next few years. The NSW will use the MicroMegas and sTGC detectors for triggering and track reconstruction. The performance and response of the MicroMegas detectors can be influenced by variations in the pressure or the gas mixture, like the admixing of humidity, of the operation gas. In addition, there is a further influence by the operation voltage, as the detectors are operated in proportional mode. In this context, MicroMegas prototypes (10x10cm²) were used to study their performance and their behavior with respect to the mentioned influences. These effects are studied with an experimental setup and according simulations. A potential compensation by the adjustment of the applied operation voltage is investigated. The obtained results affect the design of detector-slow-control system at the New Small Wheel in ATLAS. The measurements, corresponding simulation studies and the detector-slow-control system will be presented.