In the endcaps of the Cherenkov Ring Imaging Detectors for SLD, photoelectrons drift under the influence of crossed electric and magnetic fields. The geometry of the encap design is closely coupled to the Lorentz angle in the chosen drift gas. In this report, we present recent measurements of Lorentz angles and drift velocities in gases suitable for the 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 T transverse magnetic field.
Bibliographical noteFunding Information:
* Work supported by the Department of Energy, contracts DE-AC03-76SF00515 and DE-AT03-79ER70023 and by the National Science Foundation under Grants PHY85-12145 and PHY85-13808. ** Present address: University of California, San Diego, La Jolla, CA 92023, USA. Present address: Lab. de l'Accelerateur 200, F91405 Orsay Cedex, France . Present address : Diasonics Corporation, 533 Cabot South San Francisco, CA 94080, USA.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics