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
Abstract
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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