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Descrição
RPC systems of CMS, ATLAS and ALICE operate with a gas mixture with around 95% of C2H2F4, also known as R134a, which has a high GWP. Due to the use restrictions of greenhouse gases and their increasing cost, finding eco-friendly alternatives has become crucial. Mixtures with low GWPs like HFO are candidates to replace C2H2F4, but more studies have to be done. Performance of detection efficiency, spatial resolution, noise, rate capability and long term stability have to be characterized. Moreover, the prospect for the use of the RPC technology in future detector future colliders, e.g. ILC and FCC, are strictly related to the proof that RPC based detectors can operate in required performance and cope with GWP emission restrictions.
The CMS-RPC muon subsystem is being upgraded to extend the eta coverage and ensure a reliable operation in the HL-LHC phase. Since 2017 the UERJ group has participated in crucial maintenance and upgrade activities of the RPC system. It includes on-site work during LS2, tests of electronics and chambers in irradiation facilities, and the new systems' integration tests. In particular, the development of the online DAQ software and the DCS (Detector Control System) are group responsibility in this subsystem, as well as validation of prototype chambers and electronics for the upgrade program.
We plan to equip the local laboratory infrastructure at UERJ and UEA to accomplish the commitments and join the effort to find an alternative gas mixture for RPC operation, and investigate other gas detector technologies in view of contributions for future experiments, seeding a long term expertise for this kind of detector technology. A summary of the work done and the perspective for the coming years will be presented.
| Key Words | RPC gas HEP |
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