Robust CsBr/Cu Photocathodes for the Linac Coherent Light Source
The linac coherent light source (LCLS), an x-ray free-electron laser project presently under construction at SLAC, uses a 2.856 GHz rf photocathode gun with a copper cathode for its electron source. While the copper cathode is performing well for the LCLS project, a cathode material with higher quantum efficiency would reduce the drive laser requirements and allow a greater range of operating conditions. Therefore a robust CsBr/Cu photocathode with greater than 50 times the quantum yield at 257 nm relative to the present LCLS copper cathode has been investigated. Preliminary experiments using a dedicated electron source development test stand at SLAC/SSRL are encouraging and are presented in this paper.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 1017235
- Report Number(s):
- SLAC-REPRINT-2011-003; TRN: US1103187
- Journal Information:
- Phys.Rev.ST Accel.Beams 11:060702,2008, Vol. 11, Issue 6; ISSN 1098-4402
- Country of Publication:
- United States
- Language:
- English
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