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Title: Avalanche-ion back-flow reduction in gaseous electron multipliers based on GEM/MHSP
Authors: Maia, J. M. 
Mörmann, D. 
Breskin, A. 
Chechik, R. 
Veloso, J. F. C. A. 
Santos, J. M. F. dos 
Keywords: Gas avalanche electron multipliers; Gaseous photomultipliers; Ion back-flow
Issue Date: 2004
Citation: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 523:3 (2004) 334-344
Abstract: We report on avalanche-ion back-flow measurements in the novel Micro-Hole and Strip-Plate (MHSP) multiplier and in gaseous photomultipliers comprising Gas Electron Multipliers (GEMs) followed by an MHSP. In a 3-GEMs/MHSP photomultiplier with reflective photocathode, avalanche-ion back-flow fraction of ~7% and ~2% were recorded for respective effective gains of 107 and 106, in Ar/CH4 (95/5) at 760 Torr. This is about one order of magnitude reduction in ion back-flow compared to the best values measured in 4-GEMs photomultiplier at the same gain. We describe the mode of operation of the MHSP and explain its ion back-flow reduction features.
Rights: openAccess
Appears in Collections:FCTUC Física - Artigos em Revistas Internacionais

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