PACEM: a new concept for high avalanche-ion blocking

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 scintillat...

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Bibliographic Details
Main Author: Veloso, J. F. C. A. (author)
Other Authors: Amaro, F. D. (author), Azevedo, C. D. R. (author), Santos, J. M. F. dos (author), Breskin, A. (author), Lyashenko, A. (author), Chechik, R. (author)
Format: article
Language:eng
Published: 2007
Subjects:
Gaseous electron multipliers
Gaseous photomultipliers
VUV scintillation
Photocathodes
Online Access:http://hdl.handle.net/10316/4347
Country:Portugal
Oai:oai:estudogeral.sib.uc.pt:10316/4347
Description
Summary: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.

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