Author/Authors :
Artuso، نويسنده , , M. and Azfar، نويسنده , , F. and Efimov، نويسنده , , A. and Kopp، نويسنده , , S. and Mountain، نويسنده , , R. and Schuh، نويسنده , , S. and Skwarnicki، نويسنده , , Michael T. and Stone، نويسنده , , S. and Viehhauser، نويسنده , , G. and Anderson، نويسنده , , S. and Smith، نويسنده , , A. and Kubota، نويسنده , , Y. and Lipeles، نويسنده , , E. and Coan، نويسنده , , T. and Staeck، نويسنده , , J. and Fadeyev، نويسنده , , V. and Volobouev، نويسنده , , Hondamuni I. and Ye، نويسنده , , J.، نويسنده ,
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 13.5 mrad for the conventional planar radiator. With 14 detected photons we find a resolution per track of 4.5 mrad. In the first measurement ever of a ‘sawtooth’ radiator we achieve a resolution of 11.8 mrad for single photons and 4.8 mrad per track for 12.3 detected photons with a reduced geometric acceptance. These results fulfill CLEO III requirements.
