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SUMMARY:Advancing RPC Detectors with Alternative Eco-Friendly Gas Mixtures
  and Recuperation systems
DTSTART;VALUE=DATE-TIME:20230906T094000Z
DTEND;VALUE=DATE-TIME:20230906T100000Z
DTSTAMP;VALUE=DATE-TIME:20260812T031723Z
UID:indico-contribution-2960@indico.tlabs.ac.za
DESCRIPTION:Speakers: Gianluca Rigoletti (CERN)\nResistive Plate Chamber (
 RPC) detectors\, employed in the muon systems of CERN LHC experiments\, ar
 e operated with gas mixtures containing C2H2F4 (R-134a) and SF6\, both gre
 enhouse gases (GHGs) with a high global warming potential (GWP). Among str
 ategies developed by CERN Gas Team to reduce GHG emissions\, one branch is
  focused on studying alternative gas mixtures and one on recuperating gase
 s from gas mixtures used in the detectors. Firstly\, R-1234ze is investiga
 ted as a potential replacement for R-134a\, with additional tests explorin
 g the necessity of a fourth gas to maintain the same working point range a
 s R-134a based gas mixture. The performance of RPCs with R-1234ze was eval
 uated at different gamma rates in the presence of a muon beam at the CERN 
 GIF++ facility by measuring efficiency\, streamer probability\, induced ch
 arge\, cluster size\, and time resolution. Secondly\, adding CO2 to the st
 andard gas mixture is studied as a mid-term solution to reduce R-134a usag
 e and decrease CO2-equivalent emissions by 15-20%. These gas mixtures were
  characterized using muon beams and gamma background at the GIF++ facility
 \, and an aging test is planned with the collaboration of EP-DT Gas team\,
  ATLAS\, and CMS RPC teams. This mid-term solution is particularly relevan
 t to the ATLAS RPC system\, as its leak rate disallows the use of a recupe
 ration system. The third strategy involves the development of an R-134a re
 cuperation system for the standard gas mixture\, with a prototype tested i
 n 2020-2021 and a production version under operation at CMS. This recupera
 tion system separates and recuperates R-134a from the standard gas mixture
  with an efficiency of approximately 80%\, allowing the recovered gas to b
 e reused and injected into the system.\n\nhttps://indico.tlabs.ac.za/event
 /112/contributions/2960/
LOCATION: Meeting Room 2.44 - 2.46
URL:https://indico.tlabs.ac.za/event/112/contributions/2960/
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