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T: Fachverband Teilchenphysik

T 62: Myondetektoren

T 62.7: Vortrag

Mittwoch, 21. März 2018, 18:05–18:20, Z6 - SR 2.002

Measurement of Position Inaccuracies in Large Micromegas Chambers — •Patrick Scholer, Ulrich Landgraf, and Stefanie Zimmermann — Universität Freiburg

In the next long shutdown of the LHC in 2019/20, the innermost part of the end cap Muon Spectrometer of the ATLAS detector will be replaced. The new system is called New Small Wheel (NSW). It will use Micro Mesh Gaseous Detectors (Micromegas, MM) and small-strip Thin Gap Chambers (sTGCs) as its detector technologies; both providing a high spatial resolution achieved by a strip like segmented read-out structure.

The mechanical production tolerances on the strip alignment have a direct impact on the spatial resolution of the detector. In order to guarantee the tight requirements, a high precision optical measurement tool was developed allowing for measurements of the strip pattern and geometry over the large dimensions of the NSW PCBs of up to 2 m. It is based on a camera and a telecentric objective joined to a coordinate measurement machine. Specific optical object detection libraries were developed to allow for multiple object detection. The system reaches a precision of 30 µm within a spatial measurement range of 6.5 m x 1.4 m.

In this talk, the setup of the measurement system is discussed and first measurement results are presented.