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 The photon detectors of the central region have been replaced by a new system based on multi-anode photomultipliers coupled to individual fused silica lens telescopes and a fast readout electronics system, while in the outer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 sigma pi-K separation above 55 GeV/c. (C) 2007 Elsevier B.V. All rights reserved.

The fast photon detection system of COMPASS RICH-1

M. Alekseev;BUSSO, Luigi;CHIOSSO, Michela;COSTA, Sergio;DIBIASE, Nunzio Mario;PANZIERI, Daniele;
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 The photon detectors of the central region have been replaced by a new system based on multi-anode photomultipliers coupled to individual fused silica lens telescopes and a fast readout electronics system, while in the outer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 sigma pi-K separation above 55 GeV/c. (C) 2007 Elsevier B.V. All rights reserved.
2007
581
419
422
FAST-RICH; DEUTERON; READOUT; DESIGN
P. Abbon;M. Alekseev;H. Angerer;M. Apollonio;R. Birsa;P. Bordalo;F. Bradamante;A. Bressan;L. Busso;M. Chiosso;P. Ciliberti;M. L. Colantoni...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/105795
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