Progress in GEM-based gaseous photomultipliers
Chechik, M. Balcerzyk, A. Breskin, A. Buzulutskov, G. P. Guedes, D. Mormann and B. K. Singh
We discuss recent progress in gas avalanche photomultipliers operating at atmospheric pressure. They comprise UV-to-visible spectral range photocathodes coupled to multi-GEM electron multipliers. The photocathodes may be either semitransparent or reflective ones, directly deposited on the first GEM surface. These detectors provide high gain, even in noble gases, due to the suppression of photon feedback. They are sensitive to single photons, have ns time resolution, and offer good localization.