Dr Gilles De Lentdecker (Universite Libre de Bruxelles) Patrizia Barria (Universite Libre de Bruxelles (BE))
The dedicated CMS R&D program was launched to study the feasibility of using micropattern detectors for the instrumentation of the vacant |η| > 1.6 region in the present RPC endcap system. The proposed detector for CMS is a triple-GEM trapezoidal chamber, equipped with 1D readout, with dimensions (990x440-220) cm2. While during 2010-2011 the collaboration worked on the prototyping of the detector, during the first part of 2012 the new developed assembly technique, that will be used for the mass production, has been adopted. GEMs can provide precision tracking and fast trigger information, contributing on one hand to the improvement of the CMS muon Trigger and on the other hand to provide missing redundancy in the high-eta region. In the view of the next LHC long shutdown (LS1) the GEMs for CMS collaboration designed and built four full-size Triple GEM-based muon detectors. The proposed detectors, designed with a new assembly technique, are conceived to meet the stringent requirements given by the hostile environment at CMS. During 2012 several measurements have been performed using X-rays and muon/pion beams at the CERN SPS. In this paper the experience summarized above and preliminary results at the beam tests of the performance of the new full-size production prototypes will be discussed.
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