Abstract
GEM detectors are used in high energy physics experiments given their good spatial resolution, high rate capability and radiation hardness.An international collaboration is investigatingthe possibility of covering the 1.6 < |η| < 2.4 region of the CMS muon endcaps with large-areatriple-GEM detectors. The CMS high-η area is actually not fully instrumented, only Cathode Strip Chamber (CSC) are installed. The vacant area presents an opportunity for a detector technology able to to cope with the harsh radiation environment; these micropattern gas detectors are an appealing option to simultaneously enhance muon tracking and triggering capabilities in a future upgrade of the CMS detector. A general overview of this feasibility study is presented. Design and construction of small (10cm × 10cm) and full-sizetrapezoidal (1m × 0.5m) triple-GEM prototypes is described. Results from measurementswith x-rays and from test beam campaigns at the CERN SPS is shown for the small andlarge prototypes. Preliminary simulation studies on the expected muon reconstruction andtrigger performances of this proposed upgraded muon system are reported.
Highlights
Construction and performance of small and full scale prototypesIn the last two years several prototypes have been built and extensively studied [3, 4]
Simulations prove that a CMS muon system upgrade with triple-GEMs would bring significant improvements to its triggering and tracking capabilities [8]
In the following we demonstrate the operation and study of small and large scale prototypes and corroborate the requirements for a high eta tracking and trigger complement for the CMS forward muon detector
Summary
In the last two years several prototypes have been built and extensively studied [3, 4]. In figure 5 we see beam test results from standard GEMs and single mask GEMs with various operational gas mixtures with almost full efficiencies and a wide efficiency plateau [5]. We took this technology a step further and built large size detectors commensurate with requirements in CMS in the first muon station, the dimensions being about 1m × 0.5m. The readout strips are trapezoidal like the detector shown in figure 6. The detector configuration is shown in figure 7 This prototype was tested in the laboratory and a gain was measured as shown in figure 6(right) for two different sectors.
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