Avalanche-ion back-flow reduction in gaseous electron multipliers based on GEM/MHSP

J.M Maia,D Mörmann,A Breskin,R Chechik,J.F.C.A Veloso,J.M.F Dos Santos

doi:10.1016/j.nima.2003.12.017

Avalanche-ion back-flow reduction in gaseous electron multipliers based on GEM/MHSP

J.M Maia, D Mörmann + Show 4 more

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https://doi.org/10.1016/j.nima.2003.12.017

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Journal: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment	Publication Date: Feb 4, 2004
Citations: 39	License type: other-oa

Affiliation: Weizmann Institute of Science, University of Coimbra, University of Aveiro

#Micro-Hole And Strip-Plate #Gas Electron Multipliers + Show 8 more

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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 10 7 and 10 6, in Ar/CH 4 (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.

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