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Development of a high-resolution muon tracking system based on micropattern detectors

par Bortfeldt, Jonathan;Biebel, Otmar;Heereman von Zuydtwyck, David ;Hertenberger, Ralf
Référence IEEE transactions on nuclear science, 59, 4 PART 2, page (1252-1258), 6236249
Publication Publié, 2012

Article révisé par les pairs

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Résumé :

A muon tracking system consisting of four 9 cm ×, 10 cm sized bulk Micromegas detectors with 128 μ m amplification-gap and two 10 cm ×, 10 cm triple GEM detectors is foreseen for high-precision tracking of 160 GeV muons at the H8 beamline at CERN with a readout rate above 10 kHz and an overall resolution below 20 μ m. Signal studies of both detector types have been performed by recording cosmic muon and 5.9 keV X-ray signals. The analysis of the complete signal-cycles allows for the determination of rise times, pulse heights, timing fluctuations and discrimination of background, resulting in a FWHM energy resolution of about 20% and detection efficiencies of 98% and more. Models for signal formation in both detector types will be presented. A single detector spatial resolution of 75 μ m was measured for cosmic muons using a fast Gassiplex based strip readout with readout strips of 150 μ m width and a pitch of 250 μ m. Multiple scattering of low energy cosmic muons deteriorates the observable spatial detector resolution by more than 20 μ m. Additionally, we report on the sensitivity to gamma-and neutron background and on the behavior of spatial resolution as a function of background rates. © 2012 IEEE.