MPGD-based photon detectors for the upgrade of COMPASS RICH-1 and beyond.
I - Fisica nucleare e subnucleare
Aula Palazzo dell'Emiciclo - Sala B. Croce - Venerdì 27 h 15:30 - 19:00
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After pioneering gaseous detectors of a single photon for RICH applications using solid state Photo-Cathodes (PC) within the RD26 Collaboration and by the realization of the MWPCs with CsI PC for the RICH detector of the COMPASS experiment at CERN SPS, in 2016 we have upgraded COMPASS RICH by novel gaseous photon detectors based on the MPGD technology. Four new photon detectors, covering a total active area of 1.5 square m, have been installed in order to cope with the challenging efficiency and stability requirements of the COMPASS physics programme. The new detector architecture consists in a hybrid MPGD combination: two layers of THGEMs, the first of which also acts as a reflective PC thanks to CsI coating, are coupled to a bulk Micromegas on a pad-segmented anode; the signals are read out by analog F-E based on the APV-25 chip. These detectors are the first application in an experiment of MPGD-based single-photon detectors. All aspects of the COMPASS RICH-1 Photon Detectors upgrade are presented, including R&D, engineering, mass production, quality assessment and performance. Perspectives for further developments in the field of gaseous single photon detectors are also presented.