In-beam tests of a ring imaging Cherenkov detector with a multianode photomultiplier readout

Abstract A ring-imaging Cherenkov counter read out by a 100-channel PMT of active area 10 × 10 cm2 was operated successfully in a test beam at the BNL AGS with several radiator gases, including the heavy fluorocarbon C4F10. Ring radii were measured for electrons, muons, pions and kaons over the particle momentum range from 2 to 12 GeV/c, and a best resolution of σ r r = 2.3% was obtained.