Münster 2017 – scientific programme
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T: Fachverband Teilchenphysik
T 117: Myondetektoren 2
T 117.1: Group Report
Thursday, March 30, 2017, 16:45–17:05, VSH 06
Construction and Quality Assurance of Large Area Resistive Strip Micromegas for the Upgrade of the ATLAS Muon Spectrometer — •Ralf Hertenberger1, Otmar Biebel1, Bernhard Flierl1, Maximilian Herrmann1, Felix Klitzner1, Philipp Lösel1, Ralph Müller1, Chrysostomos Valderanis1, and Andre Zibell2 — 1LMU München — 2JMU Würzburg
To cope with the increasing luminosity of LHC intrinsically high-rate capable resistive strip Micromegas detectors of 2-3 m2 size will replace in 2019 the present tracking detectors of the innermost stations of the ATLAS muon endcap system.
In order to retain 15% transverse momentum resolution for 1 TeV muons, a challenging mechanical precision is required for each of the eight planes of the assembled double-quadruplets, with an alignment of the readout strips at the level of 30 µm along the precision coordinate and 80 µm perpendicular to the plane and with a single plane spatial resolution better than 100 µm at a rate capability up to 15 kHz/cm2.
Several PCB boards with micro readout strips need to be joined and precisely aligned to form a full readout plane. The precision in the alignment is reached either with precision mechanical holes or by optical masks, both referenced to the readout strips. Methods to confirm the precision of components and assembly are based on precise optical devices and X-ray or cosmic muon investigations.
We will report on the construction procedures for Micromegas quadruplets, on results from quality control, on assembly and calibration methods.