Speakers
Description
Resistive plate chamber (RPC) detectors in the Compact Muon Solenoid (CMS) operate with a gas mixture made of 95.2% $C_2H_2F_4$ (providing a high number of ion-electron pairs), 4.5% $iC_4H_{10}$ (ensuring the suppression of photon-feedback effects), and 0.3% $SF_6$ (used as an electron quencher to further operate the detector in streamer-free mode). $C_2H_2F_4$ is known to be a greenhouse gas with a global warming potential (GWP) of 1430. Several eco-friendly alternatives to $C_2H_2F_4$ have been studied in the last few years with good performance for HFO based mixtures. Degradation studies for the chambers are now ongoing. Also in this context, one short- to medium-term approach for the coming years of LHC operation could be to focus on reducing the GWP of the RPC gas mixture by only adding $CO_2$ instead of $C_2H_2F_4$. Studies were performed at the CERN Gamma Irradiation Facility (GIF++) in the North Area of the LHC where a 13.6TBq radiation source and a muon beam from SPS mimic HL-LHC conditions. In this work we present the performance and future perspectives of a 1.4 mm gap RPC chamber with HFO and $CO_2$ based mixtures with a high gamma background.
| Your name | João Pedro Gomes Pinheiro |
|---|---|
| Institute | Universidade do Estado do Rio de Janeiro |
| Email address | joao.pedro.gomes.pinheiro@cern.ch |
