Abstract
Non-freon gas mixtures (Ar/iso-C4H10) were tested as the chamber gas for 1 and 2mm gas gap Resistive Plate Chambers (RPCs) with float glass as the resistive electrodes, operated in the streamer mode. With the narrower (1mm) gas gap, streamer charge is reduced (∼1/3), which reduces the dead time (and dead area), associated with each streamer, improving the detection efficiency. The best performance was obtained for two cases: Ar/iso-C4H10=50/50 and 60/40. For the 50/50 mixture, a detection efficiency of better than 98% was obtained for the 1mm gap RPC, while the efficiency was 95% for the 2mm gap RPC, each operated as a double-gap RPC. The measured time resolution (rms) was 1.45±0.05(2.52±0.09)ns for the 1(2)mm gap RPC for the 50/50 mixture.
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