Author/Authors :
Abbon، نويسنده , , P. and Alekseev، نويسنده , , Holger M. and Angerer، نويسنده , , H. and Apollonio، نويسنده , , M. and Birsa، نويسنده , , C. Marisa R. and Bordalo، نويسنده , , P. and Bradamante، نويسنده , , F. and Bressan، نويسنده , , A. and Busso، نويسنده , , L. and Chiosso، نويسنده , , M. and Ciliberti، نويسنده , , P. and Colantoni، نويسنده , , M.L. DA COSTA LOUZADA1، نويسنده , , S. and Dalla Torre، نويسنده , , S. and Delagnes، نويسنده , , E. and Descha، نويسنده ,
Abstract :
In the context of the upgrade of COMPASS RICH-1, we are developing a fast photodetection system for RICH counters, based on UV extended Multi-Anode PhotoMultiplier Tubes (MAPMT) and a custom, low dead-time electronic readout system. Photons are concentrated on the MAPMT photocathode by an optical system that preserves the position information. The ratio between the collection and the photosensitive surfaces is ∼ 7.5 in our design, larger than in previous applications. A new front-end electronics, based on a modified version of the MAD4 discriminator chip, is being realized to digitize the MAPMT signals. We report about the design of the photodetection system and of the associated electronic readout system, and on the preliminary test beam results.
Keywords :
Multianode photomultiplier tubes , UV lenses , rich , COMPASS
