Development of Gas Systems for Gaseous Detector Operation at HL-LHC

by Mara Corbetta (Universite Claude Bernard Lyon I (FR))

Wednesday 12 May 2021, 11:00 → 12:00 Europe/Zurich

CERN

The long consolidation and upgrade program that is being realized during LS2 concerns among others the Muon Systems of LHC Experiments. Such detector systems are composed of gaseous detectors for which a correct and stable gas mixture is a key requirement to guarantee good and stable long-term performance. Greenhouse gases (GHGs) are widely used as gas mixture components in LHC gaseous detectors, therefore their operation shall keep into account the latest CERN requirements in terms of reduction of GHGs emission and gas system cost. This seminar will address the development and upgrades of two different research lines put in place to contribute to the CERN strategy to minimize GHGs consumption.  The first is the operation of gas systems with gas recirculation, in particular for the Triple-GEM detectors case, which performance was validated in a HL-LHC-like radiation environment, in terms of long-term stability, Muon detection efficiency and CF4-based impurity production. Another possible strategy to limit GHG emission is the recuperation of valuable gas components after their usage in the detectors, with the aim of re-injecting them in the gas system. The recuperation of two GHGs used in LHC Experiments gaseous detectors will be discussed, CF4 and C2H2F4. The design and operation of CF4 recuperation plants on the LHCb RICH2 and CMS CSC gas systems will be illustrated, showing how good recuperation efficiencies can be reached with a good purity of the recuperated CF4. Furthermore, the development of a C2H2F4 recuperation prototype plant will be presented, which characterization proved a high separation efficiency (about 80%) and an extremely good quality of the recuperated C2H2F4.

DTtraining_MCorbetta.pdf