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T: Fachverband Teilchenphysik
T 117: Myondetektoren 2
T 117.7: Vortrag
Donnerstag, 30. März 2017, 18:20–18:35, VSH 06
Precision Studies with Resistive Strip Micromegas and their Dependence on Detector Size — •Philipp Lösel1, Otmar Biebel1, Bernhard Flierl1, Maximilian Herrmann1, Ralf Hertenberger1, Felix Klitzner1, Ralph Müller1, and Andre Zibell2 — 1LMU München, Germany — 2JMU Würzburg, Germany
Currently square-meter sized Micromegas are of big interest for many particle physics experiments. Smaller Micromegas are used often as reference detectors for testbeam setups. They have been intensively investigated in particle beams under background irradiation and with cosmic muons. Micromegas have excellent spatial resolution below 100 µm for perpendicular incident of the traversing particle. Additionally Micromegas allow for angle reconstruction in a single plane with an angular resolution of up to 2∘ depending on the drift field. The achievable resolution is limited for measurements with cosmic muons due to increased multiple scattering at lower energies.
We will present a comparison of the spatial resolution, angular resolution, efficiency and signal shape effects of square-meter sized resistive strip Micromegas in comparison with (10 × 10) cm2 versions in particle beams as well as in measurements with cosmic muons. The Micromegas were exposed to 120 GeV pions at the H6 beam-line at SPS/CERN, where the test Micromegas were investigated in a telescope, consisting of four reference Micromegas. Measurements with cosmic muons were performed in the Cosmic Ray Facility at LMU Munich with two high precision Monitored Drift Tube chambers for reference tracking and three small Micromegas for comparison.