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Title: PACEM: a new concept for high avalanche-ion blocking
Authors: Veloso, J. F. C. A. 
Amaro, F. D. 
Azevedo, C. D. R. 
Santos, J. M. F. dos 
Breskin, A. 
Lyashenko, A. 
Chechik, R. 
Keywords: Gaseous electron multipliers; Gaseous photomultipliers; VUV scintillation; Photocathodes
Issue Date: 2007
Citation: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 581:1-2 (2007) 261-264
Abstract: We present the Photon-Assisted Cascaded Electron Multiplier (PACEM) as a potential alternative for ion back-flow suppression in gaseous cascade electron multipliers. Using a Micro Hole and Strip Plate-Gas Electron Multiplier (MHSP-GEM) configuration, the number of ions flowing back to the scintillation region is about 1.5 ions per primary electron at an optical gain of 6.5 and a drift field of 0.1 kV/cm, and about 10 ions per primary electron at an optical gain of 10 and a drift field of 0.5 kV/cm. These allow reaching ion back-flow values close to 10-4 and 10-5 at typical operation conditions of TPCs and GPMs, respectively.
Rights: openAccess
Appears in Collections:FCTUC Física - Artigos em Revistas Internacionais

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