Recent Investigations of Cascaded GEM and MHSP detectors
R. Chechik, A. Breskin, G. P. Guedes, D. Moermann, J. Maia, V. Dangendorf, D. Vartzky, J. M. F. Dos Santos, J. F. C. A. Veloso
Abstract
We present results from our recent investigations on detectors comprising cascaded gas electron multipliers (GEM) and cascaded GEMs with micro-hole and strip (MHSP) electrodes. We discuss the factors governing the operation of these fast radiation imaging detectors, that have single-charge sensitivity. The issue of ion-backflow and ion-induced secondary effects is discussed in some detail, presenting ways for its reduction and suppression. Applications are presented in the fields of photon imaging in the UV-to-visible spectral range as well as x-ray and neutron imaging.
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