Abstract
The CLEO collaboration is preparing a major upgrade of its present detector including a RICH detector for particle identification. This subdetector system follows the ‘proximity focussing’ design and uses Lithium Fluoride (LiF) crystal radiators and MWPCs filled with a CH4/TEA gas mixture. Part of the radiator crystals will have the new ‘sawtooth’ geometry. We have tested the first two of the 30 detector modules together with the first radiator crystals in a muon halo beam at Fermilab. For the measurement of the Cherenkov angle we obtain a single photon measurement error of 13.5mrad for the conventional planar radiator. With 14 detected photons we find a resolution per track of 4.5mrad. In the first measurement ever of a ‘sawtooth’ radiator we achieve a resolution of 11.8mrad for single photons and 4.8mrad per track for 12.3 detected photons with a reduced geometric acceptance. These results fulfill CLEO III requirements.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
