Abstract
Architectures based on multiple layers of thick gas electron multipliers offer an answer to the quest for novel gaseous counters with single photon detection capability able to overcome all the limitations of the present generation of gaseous photon detectors. A systematic R&D programme has been performed to achieve a deep understanding of the characteristics of these multipliers and to optimize their parameters in view of the photon detection application. Recently a new hybrid approach has been considered: an architecture where the last multiplication stage is obtained by using a MICROMEGAS structure. The characteristics of the hybrid detector are discussed an d preliminary results obtained with a first prototype are reported.
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