Abstract
At the CERN LHC experiments, several gaseous detector technologies are operated in gas recirculation mode to lower operational costs and gas emissions. In the next years, Micro Pattern Gaseous Detector (MPGD) technologies will be largely implemented in the LHC experiments, with dedicated gas systems, and they will experience a significantly increased background radiation rate, especially in the HL-LHC phase. It is therefore fundamental to study MPGD operated with LHC gas systems, especially under gas recirculation, to be able to guarantee their safe long-term operation. In this context, the performance of Gas Electron Multiplier (GEM) detectors operated in gas recirculating systems have been studied at the CERN Gamma Irradiation Facility (GIF++), which provides an intense gamma irradiation along with a Muon beam from the SPS accelerator. Triple-GEM detectors performance has been studied in relation to operation stability during long-term high rate irradiation, as well as in terms of Muon detection efficiency with different gamma background rates. Both tests were realized with various gas mixtures and gas system conditions. A complete overview of the results obtained at the GIF++ is presented, showing the successful operation of Triple-GEM detectors during long-term high-rate irradiation and good Muon detection efficiency in LHC HL-like background radiation.
Highlights
Gas Electron Multiplier (GEM) detectors belong to the new generation of Micro Pattern Gaseous Detectors (MPGD) [1], and in the last years they have been considered as tracking devices for Muon Systems in LHC experiments
Triple-GEM detectors have successfully been part of the LHCb experiment [2] during Run1 and Run2 as well as of TOTEM2 [3], and they are being installed in the CMS Muon System to be operational from Run3 onwards, to cope with the high rate environment of the future phases of the LHC [4]
The problem of impurities accumulation becomes even more significant when gas systems are operated under gas recirculation, necessary to reduce Greenhouse Gases (GHG) emission and detector operational costs [5]
Summary
Gas Electron Multiplier (GEM) detectors belong to the new generation of Micro Pattern Gaseous Detectors (MPGD) [1], and in the last years they have been considered as tracking devices for Muon Systems in LHC experiments. Triple-GEM detectors have successfully been part of the LHCb experiment [2] during Run and Run as well as of TOTEM2 [3], and they are being installed in the CMS Muon System to be operational from Run onwards, to cope with the high rate environment of the future phases of the LHC [4]. Detectors efficiency for Muon detection could be affected by the presence of the intense background Operation in such condition could cause detector aging that would compromise long term performance stability. Triple-GEM detectors performance was studied in a LHClike high-rate radiation environment, testing long-term operation stability and Muon detection efficiency operating the detector under gas recirculation
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