arXiv physics/05032372005-03-31physics.ins-det

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

J. F. C. A. Veloso, F. Amaro, J. M. Maia, A. V. Lyashenko, A. Breskin, R. Chechik, J. M. F. dos Santos, O. Bouianov, M. Bouianov

备注：: 23 pages, 8 figures
发表信息：: Nucl.Instrum.Meth. A548 (2005) 375-382
DOI：: 10.1016/j.nima.2005.04.063

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We present recent results on the operation of gas-avalanche detectors comprising a cascade of gas electron multipliers (GEMs) and Micro-Hole and Strip Plates (MHSPs) 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 4E-3 were obtained in cascaded R-MHSP and GEM multipliers at gains of about 1E+4, though at the expense of reduced effective gain in the first R- MHSP multiplier in the cascade.

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