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A brief description of the particle identification system (RICH) of the LHCb experiment is given. Preliminary results are given on a test of the solid radiator, the aerogel. The radiation hardness has been tested with γ's and protons. The photoelectron yield, the Cherenkov angle resolution, and π/p separation were determined with a π - and a mixed π + /proton beam of momentum between 3 and 10GeV/c. Four large hybrid photodiodes tubes were used as photodetectors.