Münster 2017 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 70: Myondetektoren

T 70.4: Vortrag

Dienstag, 28. März 2017, 17:35–17:50, VSH 06

Monte Carlo Studies on the Impact of Strip Misalignment on the Resolution of the ATLAS New Small Wheel Micromegas Detectors — •Patrick Scholer, Ulrich Landgraf, and Stephanie Zimmermann — Physikalisches Institut, 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) as one of its detector technologies; MMs have a high intrinsic spatial resolution and rate capability of >15kHz/cm².

The NSW MM system consists of 64 chambers per wheel. Each chamber has 4 active detection layers, and is build from 3-5 PCBs containing the readout-strips per layer. Therefore the mechanical precision with which readout PCBs can be positioned is a critical factor for the overall position resolution.

In this talk, the spatial resolution of the NSW MMs is investigated via a geometric Monte Carlo simulation by varying the position of the PCBs within the foreseen mechanical tolerances. Also non conformities of the strip pattern on the PCBs are taken into account. Furthermore a contactless position measurement tool will be presented. It uses a high resolution camera mounted on a CMM, which allows multi pattern recognition with a spatial resolution of 30 µm, i.e. to measure large area readout planes.