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T: Fachverband Teilchenphysik
T 81: Myondetektoren 2
T 81.1: Talk
Wednesday, March 26, 2014, 16:45–17:00, P12
High-Rate Capable and Discharge Tolerant Floating Strip Micromegas — •Jonathan Bortfeldt, Michael Bender, Otmar Biebel, Helge Danger, Bernhard Flierl, Ralf Hertenberger, Philipp Lösel, Samuel Moll, Ralph Müller, and André Zibell — LS Schaile, LMU München
Micromegas are high-rate capable micro-pattern gaseous detectors. Charge densities exceeding 1.8×108 e/mm2 can trigger non-destructive discharges in the detector, creating dead time. The impact of discharges can be reduced to a negligible level by supplying all anode strips individually with high-voltage. The discharge behavior in a novel floating strip Micromegas has been investigated in depth. We demonstrate, that the overall voltage drop after a discharge is negligible and we discuss the microscopic structure of discharges.
A floating strip Micromegas doublet with 2×128 strips and low material budget has been successfully tested in a 550 kHz 20 MeV proton beam at the tandem accelerator in Garching. We discuss the performance with respect to TPC-like single plane angular resolution, efficiency and high-rate capability.
A 48 cm×50 cm floating strip Micromegas has been tested in 120 GeV pion beams at the H6 beamline at SPS/CERN. It showed a spatial resolution of (48±2) µm, efficiencies above 97% and a homogenous gas gain with variations on the order of 15%.