Improvement of S-1 Photocathode Shelf Life Stability. Final Report.

摘要

The purpose of this program was to stabilize sensitivity of S-1photocathodes in C73435AG high speed image converters. Variations in bulb pre-and post-heating and in aging were investigated using partial tube assemblies consisting of the cathode bulb half of the standard tube. Successful processing of stable S-1photocathodes in partial tubes led to adapting the schedules to complete tube assemblies. Five tubes processed on this contract yielded high but unstable photocathode sensitivity. Continued testing of tubes being made to fill customer orders shows that control of tube heating and cooling,together with careful control of evaporated cesium,can yield stable S-1photocathodes. Additional experimentation is required to optimize a schedule yielding consistently stable photocathodes. (ERA citation 02:046186)