Hamburg 2016 – scientific programme

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T: Fachverband Teilchenphysik

T 28: Myondetektoren II

T 28.8: Talk

Monday, February 29, 2016, 18:30–18:45, VMP6 HS E

A TPC-like Readout Method for High Precision Muon-Tracking using GEM-Detectors — •Bernhard Flierl¹, Otmar Biebel¹, Jonathan Bortfeldt¹, Ralf Hertenberger¹, Felix Klitzner¹, Phillipp Loesel¹, Ralph Mueller¹, and Andre Zibell² — ¹Ludwig-Maximilians-Universität München — ²Julius-Maximilians-Universität Würzburg

Gaseous electron multiplier (GEM) detectors are well suited for tracking of charged particles. Three dimensional tracking in a single layer can be achieved by application of a time-projection-chamber like readout mode (/muTPC), if the drift time of the electrons is measured and the position dependence of the arrival time is used to calculate the inclination angle of the track. To optimize the tracking capabilities for ion tracks drift gas mixtures with low drift velocity have been investigated by measuring tracks of cosmic muons in a compact setup of four GEM-detectors of 100×100×6 mm³ active volume each and an angular acceptance of -25 to 25^∘. The setup consists of three detectors with two-dimensional strip readout layers of 0.4 mm pitch and one detector with a single strip readout layer of 0.25 mm pitch. All strips are readout by APV25 frontend boards and the amplification stage in the detectors consists of three GEM-foils. Tracks are reconstructed by the µTPC-method in one of the detectors and are then compared to the prediction from the other three detectors defined by the center of charge in every detector. We report our study of Argon and Helium based noble gas mixtures with carbon-dioxide as quencher.