Production and installation of the first GEM station in CMS

Abstract

In 2017 and during the whole 2018 LHC has reached the record beam luminosity 2 • 10 34 cm −2 s −1 , around a factor of two beyond the LHC design. In December 2018 the Large Hadron Collider (LHC) entered the LS2 phase (Long Shutdown 2), which will last until the beginning of 2021, in which the maintenance program of LHC and the other smaller accelerators is scheduled.To cope with this and also looking at the following LHC phase in which the luminosity will be increased to 5 • 10 34 cm −2 s −1 the LHC experiments must be upgraded as well. In this context the muon subsystem of the CMS experiment began installing the first GEM based detectors station (GE1/1) in July 2019, almost 5 meters from the point of interaction.GE1/1 will consist of 144 triple Gas Electron Multiplier (GEM) detectors, which will work together with the Cathode Strip Chamber (CSC) station ME1/1, improving tracking and triggering of muons produced in the pseudorapidity in range 1.6 < |η| < 2.15.

Next frontiers in particle physics detectors: INSTR2020 summary and a look into the future

“…A big step in the direction of the industrial and cost-effective manufacting of MPGDs was the development of the new fabrication technologies -resistive MM [79], to suppress destructive sparks in hadron environments, single-mask and self-stretching GEM techniques [80], which enable production of large-size foils and significantly reduce detector assembly time. Scaling up MPGD detectors, while preserving the typical properties of small prototypes, allowed their use in the LHC experiments after LS2 (Micromegas [81] in combination with Thin Gap chambers [82] in the ATLAS New Small Wheel, GEMs in the CMS Muon System [83] and in the ALICE TPC). In addition, wire-chamber based photon detectors of COMPASS RICH-1 have been replaced by hybrid MPGDs -staggered THGEM and a MM multiplication stage with CsI photocathodes -to accomplish the delicate mission of single photon detection (see section 5).…”