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A new concept is presented for the reduction of ion back-flow in GEM-basedcascaded gaseous electron multipliers, by incorporating Micro-Hole & StripPlate (MHSP) elements operating in reversed-bias mode (R-MHSP). About an orderof magnitude reduction in ion back-flow is achieved by diverting back-driftingions from their original path. A R-MHSP/2GEM/MHSP cascaded multiplier operatedat total gain of ~1.5*10^5 yielded ion back-flow fractions of 0.0015 and0.0004, at drift fields of 0.5 and 0.1 kV/cm, respectively. A 2R-MHSP/MHSPcascaded multiplier operated at a total gain of ~10^5, yielded an ion back-flowfraction of 0.003. We discuss the concept for trapping back-flowing ions inthese cascaded multipliers and the relevance to gaseous photomultiplier and TPCapplications; directions for further future developments are outlined.Comment: 17 pages, 9 figures, submitted to JINS

Advances in ion back-flow reduction in cascaded gaseous electron multipliers incorporating R-MHSP elements