A fast photon detection system has been built for the upgrade of COMPASS RICH-1, the large size gaseous RICH detector in use at the COMPASS Experiment at the CERN SPS since 2001. The photon detectors of the central region have been replaced by a new system based on multi-anode photomultipliers coupled to individual fused silica lens telescopes and a fast readout electronics system, while in the outer region the existing MWPCs with CsI photocathodes have been equipped with a new readout system, based on the APV chip. RICH-1 has been successfully operated in its upgraded version during the 2006 run. We report on the upgrade design and construction, and on the preliminary characterization of the upgraded RICH-1 performances: at saturation about 60 photons per ring have routinely been obtained and the background level has drastically been reduced thanks to the good time resolution of the new system, leading to a 2 –K separation above 55 GeV/c.
The fast photon detection system of COMPASS RICH-1
Apollonio, M.;Birsa, R.;Bradamante, F.;Bressan, A.;Ciliberti, P.;Dalla Torre, S.;Duic, V.;Giorgi, M.;Gobbo, B.;Levorato, S.;Maggiora, A.;Martin, A.;Menon, G.;Pagano, P.;Pesaro, G.;PIZZOLOTTO, CECILIA;Rocco, E.;Schiavon, P.;Silva, L.;Sozzi, F.;Steiger, L.;
2007-01-01
Abstract
A fast photon detection system has been built for the upgrade of COMPASS RICH-1, the large size gaseous RICH detector in use at the COMPASS Experiment at the CERN SPS since 2001. The photon detectors of the central region have been replaced by a new system based on multi-anode photomultipliers coupled to individual fused silica lens telescopes and a fast readout electronics system, while in the outer region the existing MWPCs with CsI photocathodes have been equipped with a new readout system, based on the APV chip. RICH-1 has been successfully operated in its upgraded version during the 2006 run. We report on the upgrade design and construction, and on the preliminary characterization of the upgraded RICH-1 performances: at saturation about 60 photons per ring have routinely been obtained and the background level has drastically been reduced thanks to the good time resolution of the new system, leading to a 2 –K separation above 55 GeV/c.Pubblicazioni consigliate
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