A simplified GaAs polarized electron source

Authors

H. M. Al-Khateeb, University of Nebraska - Lincoln
B. G. Birdsey, University of Nebraska - Lincoln
T. C. Bowen, University of Nebraska - Lincoln
A. S. Green, University of Nebraska - Lincoln
M. E. Johnston, University of Nebraska - Lincoln
Timothy J. Gay, University of Nebraska - LincolnFollow

Document Type

Article

Date of this Version

October 1999

Comments

Published in REVIEW OF SCIENTIFIC INSTRUMENTS, VOLUME 70, NUMBER 10, OCTOBER 1999. Copyright © 1999 American Institute of Physics. Used by permission.

Abstract

We report operational and construction details of a simplified GaAs polarized electron source. It is contained in a modified 4.63 in. Conflat four-way cross, and uses a single 56 ℓ /s turbomolecular pump. The design incorporates multiple cesiators to extend source lifetime, a new spring-clamp GaAs crystal mounting design to provide uniform crystal heating, and a very simple tubular 90° electrostatic deflector. We also discuss matters related to preparing, heat cleaning, and activating the GaAs crystal.