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 quan...

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Published in:Physical review special topics. PRST-AB. Accelerators and beams 2008-06, Vol.11 (6), p.060702, Article 060702
Main Authors: Maldonado, Juan R., Liu, Zhi, Dowell, D. H., Kirby, Robert E., Sun, Yun, Pianetta, Piero, Pease, Fabian
Format: Article
Language:English
Subjects:
Cathodes
Cesium bromides
Coherent light
Copper
Electrode materials
Free electron lasers
Light sources
Photocathodes
Quantum efficiency
Robustness
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Summary: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.
ISSN:1098-4402
1098-4402
2469-9888
DOI:10.1103/PhysRevSTAB.11.060702