Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 62: Myondetektoren

T 62.6: Talk

Wednesday, March 21, 2018, 17:50–18:05, Z6 - SR 2.002

Effects of humidity on the gas gain in MicroMegas detectors — •Thorwald Klapdor-Kleingrothaus, Stephanie Zimmermann, and Ulrich Landgraf — Universität Freiburg

The Micro-Mesh-Gaseous Detectors (MicroMegas) are planar and high-rate capable detectors with a very good spatial resolution. In the recent years, the MM technology was intensively studied in view of replacing the innermost station of the ATLAS endcap muon spectrometer. The new detector assembly is known as the New Small Wheel (NSW) Upgrade and will be installed in the next long LHC shutdown in 2019/20. The NSW will use the MicroMegas technology as well as small strip-Thin-Gap-Chambers (sTGC) for triggering and track reconstruction. In this context, small MicroMegas prototypes (10x10cm) were developed to study their performance and their behavior. The presented work uses a cosmic muon test setup with two of these prototypes in combination with a scalable readout system. Influences on the detector performance caused by variations in the pressure of the operation gas or by changes in the humidity at the low ppm level are investigated. These parameters will affect the later design of detector-slow-control system at the NSW in ATLAS. The results of the first measurements and corresponding simulation studies are presented.