Ion-induced effects in GEM & GEM/MHSP gaseous photomultipliers for the UV and the visible spectral range

Details Ion-induced effects in GEM & GEM/MHSP gaseous photomultipliers for the UV and the visible spectral range Ion-induced effects in GEM & GEM/MHSP gaseous photomultipliers for the UV and the visible spectral range

2005-02-24

arxiv.org/abs/physics/0502132v1

Nucl.Instrum.Meth.A553:46-52,2005

Physics

Instrumentation and Detectors

6 pages, 8 figures

Scientific paper

10.1016/j.nima.2005.08.005

We report on the progress in the study of cascaded GEM and GEM/MHSP gas avalanche photomultipliers operating at atmospheric pressure, with CsI and bialkali photocathodes. They have single-photon sensitivity, ns time resolution and good localization properties. We summarize operational aspects and results, with the highlight of a high-gain stable gated operation of a visible-light device. Of particular importance are the results of a recent ion-backflow reduction study in different cascaded multipliers, affecting the detector's stability and the photocathode's liftime. We report on the significant progress in ion-blocking and provide first results on bialkali-photocathode aging under gas multiplication.

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