Hamburg 2016 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 28: Myondetektoren II
T 28.7: Vortrag
Montag, 29. Februar 2016, 18:15–18:30, VMP6 HS E
Calibration of Large Area Micromegas Using Cosmic Rays — •Philipp Lösel1, Otmar Biebel1, Jonathan Bortfeldt1, Bernhard Flierl1, Ralf Hertenberger1, Ralph Müller1, and Andre Zibell2 — 1LMU München, Germany — 2JMU Würzburg, Germany
The high luminosity upgrade of the LHC storage ring implies an upgrade of the Muon Spectrometer of the ATLAS experiment. The presently installed detectors of the inner end-cap region cannot cope with the increased background situation and will be replaced by Micromegas and sTGC detectors. Before installation at CERN, the 2 m2 sized Micromegas quadruplets (SM2) built in Germany will be calibrated.
The LMU Cosmic Ray Measurement Facility (CRF) consists of two Monitored Drift Tube chambers (MDT) with an active area of about 9 m2 for muon tracking and two trigger hodoscopes with sub-ns time-resolution and with additional position information along the wires of the MDTs. With an angular acceptance of -30∘ to +30∘ the CRF allows for centroidal or µTPC position determination and thus for calibration in three dimensions. Of particular interest are potential deviations in the micro pattern readout structures or potential deformations of the whole detector.
The Performance of the CRF is presently investigated using a telescope of a 1 m2 and three 100 cm2 resistive strip Micromegas. We report on the differences in performance between large and small detectors, report on homogeneity of efficiency and pulse height, and present results on deformation and performance of the 1 m2 Micromegas.