Abstract
We show that adding CF 4 to the standard Ar/CO 2 gas mixture allows to substantially improve the time resolution of triple-GEM detectors. In this paper we discuss measurements of time resolution, discharge probability per incident charged particle and pad multiplicity of a triple-GEM detector with pad readout, with new gas mixtures with CF 4 and isobutane. Results for detectors with GEM foil size of both 10×10 cm 2 and 20×24 cm 2 are presented.
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