Aachen 2019 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 91: Elektronik

T 91.2: Vortrag

Donnerstag, 28. März 2019, 16:15–16:30, S02

Effects of humidity on deformation of PCBs in the ATLAS New Small Wheel — •Yanwen Hong, Ulrich Landgraf, and Stephanie Zimmermann — Universität Freiburg

The New Small Wheel (NSW) will replace the present Small Wheel for the Muon Spectrometer upgrade of the ATLAS experiment during the Long Shutdown 2 in next years. Small-strips Thin Gap Chamber (sTGC) and Micro-Mesh- Gaseous Detectors (Micromegas) technologies will be employed in the NSW. Printed circuit boards (PCBs) are widely used in Micromegas readout boards and the sTGC. Unfortunately the humid environment can cause deformation of the PCBs during the transportation, storage process and assembly of the NSW. This deformation misplaces the readout strip pattern and furthermore has a direct impact on the spatial resolution of the detectors. In this context, a closed chamber which can be flushed with controlled humidity density nitrogen was designed and built and a high precision Coordinate Measurement Machine is used to measure the deformation of the sTGC board and Micromegas panel over the large dimensions up to 2 m. Later on, a 3D reconstruction will be achieved to study the deformation in both Z direction and XY-plane. In this talk, the setup of the measurement system is discussed and first measurement results are presented.