Alexeev, M Birsa, R Bradamante, F Bressan, A Chiosso, M Ciliberti, P Croci, G Colantoni, M L Dalla Torre, S Duarte Pinto, S Denisov, O Diaz, V Ferrero, A Finger, M Finger, M Jr Fischer, H Giacomini, G Giorgi, M Gobbo, B Heinsius, F H Herrmann, F Jahodova, V Königsmann, K Lauser, L Levorato, S Maggiora, A Martin, A Menon, G Nerling, F Panzieri, D Pesaro, G Polak, J Rocco, E Ropelewski, L Sauli, F Sbrizzai, G Schiavon, P Schill, C Schopferer, S Slunecka, M Sozzi, F Steiger, L Sulc, M Takekawa, S Tessarotto, F Wollny, H THGEM based photon detector for Cherenkov imaging applications Nucl. Instrum. Methods Phys. Res., A 396-397 617 We are developing a single photon detector for Cherenkov imaging counters. This detector is based on the use of THGEM electron multipliers in a multilayer design. The major goals of our project are ion feedback suppression down to a few per cent, large gain, fast response, insensitivity to magnetic fields, and a large detector size. We report about the project status and perspectives. In particular, we present a systematic study of the THGEM response as a function of geometrical parameters, production techniques and the gas mixture composition. The first figures obtained from measuring the response of a CsI coated THGEM to single photons are presented. eng 2010

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