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Title: Ion-induced effects in GEM and GEM/MHSP gaseous photomultipliers for the UV and the visible spectral range
Authors: Breskin, A. 
Mörmann, D. 
Lyashenko, A. 
Chechik, R. 
Amaro, F. D. 
Maia, J. M. 
Veloso, J. F. C. A. 
Santos, J. M. F. dos 
Keywords: Gaseous electron multipliers; Gaseous photomultipliers; Photocathodes
Issue Date: 2005
Citation: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 553:1-2 (2005) 46-52
Abstract: 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 lifetime. We report on the significant progress in ion-blocking and provide first results on bialkali-photocathode aging under gas multiplication.
Rights: openAccess
Appears in Collections:FCTUC Física - Artigos em Revistas Internacionais

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