Author/Authors :
Abbon، نويسنده , , P. and Alexeev، نويسنده , , Holger M. and Angerer، نويسنده , , H. and Birsa، نويسنده , , C. Marisa R. and Bordalo، نويسنده , , P. and Bradamante، نويسنده , , F. and Bressan، نويسنده , , A. and Chiosso، نويسنده , , M. and Ciliberti، نويسنده , , P. and Colantoni، نويسنده , , M.L. and Dafni، نويسنده , , T. and Dalla Torre، نويسنده , , S. and Delagnes، نويسنده , , E. and Denisov، نويسنده , , O. and Deschamps، نويسنده , , H. and Diaz، نويسنده ,
Abstract :
A fast photon detection system has been built as a part of the upgrade of the COMPASS RICH-1 detector: it is based on 576 multi-anode photomultiplier tubes (MAPMTs) coupled to individual fused silica lens telescopes and fast readout electronics. This system has replaced the MWPCs with CsI photo-cathodes in the central region ( 1.3 m 2 , 25% of the total area) of the COMPASS RICH-1 photon detectors and has successfully been operated during the data taking in 2006 and 2007. We report about the fast photon detection system design, construction and commissioning, in particular about the design optimization and the validation tests of the lens telescopes. Preliminary values for the increased performances of COMPASS RICH-1 after the upgrade are also presented.
Keywords :
UV lenses , Photon detection , COMPASS , rich , MaPMT
