The LHCb RICH detectors

LHCb, one of the experiments of the Large Hadron Collider at CERN, has been designed for high-precision measurements of the parameters of the CKM quark-mixing matrix, and for studies of rare $B$-hadron decays, An essential part of the experiment is an efficient system of particle identification, effective over a momentum range of 1-100 GEV/$c$. For this we use two ring imaging Cherenkov detectors with three Cherenkov radiators. Photons in the wavelength range 200-600 nm are detected by 484 pixel hybrid photon detectors.