Abstract
With the high luminosity upgrade of the LHC the ATLAS Muon spectrometer will face increased particle rates, requiring an upgrade of the innermost end-cap detectors with a high-rate capable technology. Micromegas have been chosen as main tracking technology for this New Small Wheel upgrade. In an intense R&D and prototype phase the technology has proven to meet the stringent performance requirements of highly efficient particle detection with better than 100μm spatial resolution, independent of the track incidence angle up to 32°, in a magnetic field B≤0.3T and at background hit rate of up to 15kHz/cm2.
Highlights
With the high luminosity upgrade of the LHC the ATLAS Muon spectrometer will face increased particle rates, requiring an upgrade of the innermost end-cap detectors with a high-rate capable technology
Micromegas have been chosen as main tracking technology for this New Small Wheel upgrade
Two Micromegas Small Wheel (MMSW) prototype quadruplets were built, following the layout of the New Small Wheel (NSW) detectors described in Section 2, despite their reduced size (0.95 Â 0.5 m2) compared to the full NSW modules
Summary
Resistive Micromegas (MICRO MEsh GAseous Structure) detectors have proven over the years to be a reliable high rate capable detector technology characterized by an excellent spatial resolution and discharge immunity. The NSW shall provide a muon pT measurement with 10% resolution at 1 TeV/c This requires fully efficient Micromegas chambers with spatial resolution better than 100 μm independent of the track incidence angle (r 32°), the magnetic field (B ≤ 0.3 T) and with a rate capability of up to 15 kHz/cm. A quadruplet design has been chosen for the NSW Micromegas to accommodate four detector layers within the 8 cm wide envelope of a module (Fig. 2). To reach a spatial resolution of 100 μm, the 300 μm wide readout strips are orientated perpendicularly to the precision coordinate on the two sides of the first panel (eta).
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