(1) Anglestudiesforthesldendcap Cerenkovringimagingdetector*

The design of the endcap Cerenkov Ring Imaging Detectors for SLD requires a detailed understanding of how electrons drift in gases under the influence of crossed electric and magnetic fields. In this report, we present recent measurements of Lorentz angles and drift velocities in gases suitable for the endcap CRID photon detectors. We compare these measurements to predictions from a theoretical model; good agreement is observed. Based on our results we present a design for detectors operating in a 0.6 Tesla transverse magnetic field. Poster Presentation at the London Conference on Position Sensitive Detectors September 7 11, 1987, University College London, England ‘, * Work supported by the Department of Energy, contracts DE-AC03-76SF00515 and DE-AT03-79ER70023 and by the National Science Foundation under Grants PRY85-12145 and PHY85-13808. 1 Present Address: University of California, San Diego, La Jolla, CA 92023. 2 Present Address: Lab. de 1’Accelerateur Lineaire, Batiment 200, F91405 Orsay, Cedex, France 3 Present Address: Diasonics Corporation, 533 Cabot Rd., South San Francisco, CA 94080