Abstract
Resistive strip Micromegas detectors have been tested extensively as small detectors of about 10×10cm2 in size and they work reliably at high rates of 100kHz/cm2 and above. Tracking resolution well below 100μm has been observed for 100GeV muons and pions. Micromegas detectors are meanwhile proposed as large area muon precision trackers of 2–3m2 in size. To investigate possible differences between small and large detectors, a 1m2 detector with 2048 resistive strips at a pitch of 450μm was studied in the LMU Cosmic Ray Measurement Facility (CRMF) using two 4×2.2m2 large Monitored Drift Tube (MDT) chambers for cosmic muon reference tracking. A segmentation of the resistive strip anode plane in 57.6mm×93mm large areas has been realized by the readout of 128 strips with one APV25 chip each and by eleven 93mm broad trigger scintillators placed along the readout strips. This allows for mapping of homogeneity in pulse height and efficiency, determination of signal propagation along the 1m long anode strips and calibration of the position of the anode strips.
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