Cs-K-Te photo cathodes: a promising electron source for free-electron lasers

D. Bisero, B.M. van Oerle, G.J. Ernst, J.W.J. Verschuur*, W.J. Witteman

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)


The characteristics of Cs–K–Te photo-cathodes when used in a photo-cathode linear accelerator will be presented together with a short review of their photo-emissive properties. The cathodes have been illuminated by light pulses obtained by frequency quadrupling the light of a Nd:YLF laser. The emitted electrons have been accelerated in a 1.3 GHz RF linear accelerator operating at an energy of 6 MeV. The quantum efficiency of the Cs–K–Te cathodes at 259 nm decreases exponentially with operation time, but recovers partially during storage in UHV between successive operating sessions. These two effects tend to compensate for long times, so that saturation of the quantum efficiency value at about 2% is reached after 20 h of operation. A Cs–K–Te cathode, degraded by use in the accelerator, can be rejuvenated to about 60% of its initial quantum efficiency by heating it to 120°C for 1 hour.
Original languageEnglish
Pages (from-to)311-315
Number of pages5
JournalNuclear instruments & methods in physics research. Section A : Accelerators, spectrometers, detectors and associated equipment
Issue number1-3
Publication statusPublished - 1998
Event19th International Free Electron Laser Conference and the 4th FEL Users' Workshop 1997 - Beijing, China
Duration: 18 Aug 199721 Aug 1997
Conference number: 19


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