A Prototype RICH Detector Using Multi-Anode Photo Multiplier Tubes and Hybrid Photo-Diodes

The performance of a prototype Ring Imaging Cherenkov Detector is studied using a charged particle beam. The detector performance, using CF4 and air as radiators, is described. Cherenkov angle precision and photoelectron yield using hybrid photodiodes and multi-anode PMTs agree with simulations and are assessed in terms of the requirements of the LHCb experiment. University of Cambridge, Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE, UK. CERN, EP Division, 1211 Geneva 23, Switzerland. University of Glasgow, Department of Physics, Glasgow G12 8QQ, UK. Imperial College of Science Technology & Medicine, Blackett Laboratory, Prince Consort Road, London SW7 2AZ, UK. University of Oxford, Department of Nuclear Physics, Keble Road, Oxford OX1 3RH, UK. Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, UK.