The Cleo Rich Detector
75 pages, 57 figures, (updated July 26, 2005 to reflect reviewers comments), to be published in NIM A More information at http://arxiv.org/abs/physics/0506132
We describe the design, construction and performance of a Ring Imaging Cherenkov Detector (RICH) constructed to identify charged particles in the CLEO experiment. Cherenkov radiation occurs in LiF crystals, both planar and ones with a novel ``sawtooth''-shaped exit surface. Photons in the wavelength interval 135--165 nm are detected using multi-wire chambers filled with a mixture of methane gas and triethylamine vapor. Excellent pion/kaon separation is demonstrated.