Abstract
The properties of a 3-GEM (Gas Electron Multiplier) element photomultiplier, with a semitransparent CsI photocathode and CF 4 gas filling, are presented. Compared to other gas mixtures, such as CH 4, Ar/CH 4, Ar/N 2 and He/Ar/N 2, CF 4 has superior performance: the highest gain, approaching 10 7, the fastest, 8 ns wide signal and the lowest photoelectron backscattering; the latter allows to reach photocathode quantum efficiency values approaching that in vacuum. The time resolution of the multi-GEM photomultiplier for single photoelectrons was measured to be 2 ns. These properties are of high relevance for applications in Cherenkov detectors and in tracking devices.
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