Robust CsBr/Cu Photocathodes for the Linac Coherent Light Source

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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Veröffentlicht in:Physical review special topics. PRST-AB. Accelerators and beams 2011-06, Vol.11 (6)
Hauptverfasser: Maldonado, Juan R., /Stanford U., Phys. Dept, Liu, Zhi, Dowell, D.H., Kirby, Robert E., Sun, Yun, Pianetta, Piero, /SLAC, Pease, Fabian
Format: Artikel
Sprache:eng
Schlagworte:
Accelerators
CATHODES
CONSTRUCTION
COPPER
ELECTRON SOURCES
FREE ELECTRON LASERS
LASERS
LIGHT SOURCES
LINEAR ACCELERATORS
PARTICLE ACCELERATORS
PHOTOCATHODES
QUANTUM EFFICIENCY
STANFORD LINEAR ACCELERATOR CENTER
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Zusammenfassung: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