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

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arxiv physics/0503237 v1 pith:2GDPD3US submitted 2005-03-31 physics.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
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M. Bouianov
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classification physics.ins-det
keywords multipliersoperationr-mhspcascadegas-avalanchemhspmodemultiplier
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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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