The novel photon detectors based on MPGD technologies for COMPASS RICH-1 upgrade

The RICH-1 detector of the COMPASS experiment at CERN SPShas been upgraded for the 2016 physics run: four MWPC-based photon detectorshave been replaced by newly developed detectors based on MPGD technologies, fora total active area of 1.4 $m^2$. The new detector architecture consists in a hybrid com-bination of two layers of THGEMs, the first acting as a reflective photocathode, anda Micromegas equipped with a pad segmented anode. The signals are read out viacapacitive coupling by an analog F-E based on the APV25 chip. The characteristicsand the performance of the new hybrid photon detectors are presented.