Particle Identification with the Jefferson Lab CLAS12 Ring Imagning Cherenkov Detector

A Ring Imaging CHerenkov (RICH) detector was built for Hall B at Jefferson lab as an addition to its base equipment for pion, proton and kaon separation in the 3 to 8 GeV/c momentum range. A second RICH detector is under construction. In this talk I will present the principal of Cerenkov detection, this RICH detector and its component and will focus on my work on the diagnosis of the multi-anode photomultpliers that are used as a screen detector for Cherenvov photons. I will also present my work on the software development for timing calibrations and online monitoring.