MHSP in reversed-bias operation mode for ion blocking in gas-avalanche multipliers

• Author(s): Veloso, J. F. C. A. ; Amaro, F. D. ; Maia, J. M. ; Lyashenko, A. V. ; Breskin, A. ; Chechik, R. ; Santos, J. M. F. dos ; Bouianov, O. ; Bouianov, M.
• Date: 2005
• Persistent ID: http://hdl.handle.net/10316/4420
• Origin: Estudo Geral - Universidade de Coimbra
• Subject(s): Gaseous photomultipliers; Gas avalanche electron multipliers; Ion back-flow
• Document Type: Article
• Language: English

Description

We present recent results on the operation of gas-avalanche detectors comprising a cascade of gas electron multipliers (GEMs) and Mico-Hole & Strip Plate (MHSP) multiplier operated in reversed-bias (R-MHSP) mode. The operation mechanism of the R-MHSP is explained and its potential contribution to ion-backflow (IBF) reduction is demonstrated. IBF values of 4×10-3 were obtained in cascaded R-MHSP and GEM multipliers at gains of about 104, though at the expense of reduced effective gain in the first R-MHSP multiplier in the cascade. http://www.sciencedirect.com/science/article/B6TJM-4GFCMS7-1/1/3106a1da456923461b6eba3e10649401