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Resistive Plate Chambers (RPCs) are gaseous detectors that find a great use at the CERN LHC experiments as muon trigger, due to their excellent time resolution. Currently they are operated with a greenhouse gas mixture, containing C2H2F4 (R134a) and SF6. These gases exhibit a high Global Warming Potential (GWP) value and therefore they are subject to European regulations for the reduction of the use of these gases. The goal of this work is to study the performances of RPC detectors operated with eco-friendly gas mixtures. The detectors were tested at the CERN Gamma Irradiation Facility (GIF ++), which provides a high energy muon beam combined with an intense gamma radiation source, allowing to simulate the background radiation expected at the High Luminosity LHC Phase (HL-LHC).The eco-friendly gas mixtures selected for these studies, such as CO2 and the new Hydro-Fluoro-Olefin (HFO), exhibit a low GWP value.The data obtained were analyzed and performance were compared with the RPC gas mixture recently in use at ATLAS, CMS and ALICE experiments. In particular, the following RPC parameters were analysed: efficiency, avalanche and streamer charge, streamer probability, cluster and detector currents at different gamma rates, ranging from few Hz/cm2 to 600 Hz/cm2.The Gas Mixture with the best trade-off between GWP and good detectors performances was selected and now several RPC detectors are under aging test at GIF++ for final validations.
Link zoom:
https://infn-it.zoom.us/j/97832927493?pwd=MXNwcVJKbWlkZk1QZUx6dDJNQVlEdz09
ID riunione: 978 3292 7493
Codice d’accesso: 303992
Andrea Gozzelino