COMPASS RICH-1 has been upgraded in 2016 with Hybrid MPGD-based photon detectors, covering a total active area of 1.4 square meters. The detector architecture consists of two layers of THGEMs, the first of which also acts as a reflective photocathode and a bulk Micromegas on a pad-segmented anode; the signals are read-out via capacitive coupling by analog F-E based on the APV-25 chip.
The detectors have been commissioned in 2016 and during the 2017 COMPASS physics run they provided stable and efficient operation.
The main aspects of the COMPASS RICH-1 Photon Detectors upgrade are presented together with the problems encountered during the commissioning phase and the adopted solutions.
The response of the hybrid detectors is illustrated and their performance is presented.
The combination and comparison of the three photon detector technologies (MAPMTs, MWPCs and MPGDs) in COMPASS RICH-1 are discussed.
The perspectives for further developments and applications of these novel detectors will be addressed.
The talk is on behalf of the COMPASS RICH group.