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T: Fachverband Teilchenphysik

T 74: Gaseous Detectors II

T 74.4: Talk

Thursday, March 19, 2026, 17:00–17:15, KH 01.014

Performance Studies on Ecofriendly Gas Alternatives for RPC Detectors — Roberto Guida², Stefania Juks³, •Maximilian Kerker¹, Beatrice Mandelli², Gianluca Rigoletti², Stefan Roth¹, and Mattia Verzeroli⁴ — ¹RWTH Aachen University — ²CERN — ³Université Paris Saclay — ⁴Shanghai Jiao Tong University

Resistive Plate Chambers are important particle detectors used as muon triggers in many experiments at the Large Hadron Collider. At the ALICE, ATLAS, and CMS LHC experiments, a gas mixture made of 65-95% R-134a, 4.5-10% i-C4H10 and 0.3-0.5% SF6 is used. R-134a and SF6 are greenhouse gases having a significant global warming potential of 1430 and 24300 respectively. In this work, a study was conducted searching for alternatives for SF6. In particular, two chlorinated hydrofluoroolefins, R-1233zd and R-1224yd, were identified as possible SF6 replacements. These gases were tested in different concentrations both in laboratory conditions and at the Gamma Irradiation Facility at CERN under LHC-like conditions. The RPC performance was evaluated by measuring the detector's efficiency, currents, streamer probability, cluster size and time resolution. The results were compared against SF6-based gas mixtures. Preliminary results will be presented.

Keywords: RPC; Ecofriendly; Alternatives; SF6