K-Te photo cathodes: A new electron source for photoinjectors

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

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

K–Te photocathodes deposited on a Mo substrate have been successfully used as an electron source in the free electron laser of University of Twente. Long lifetimes have been measured: after more than 20 h of operation in the accelerator a K–Te cathode with 4.75% initial quantum efficiency still displays a 1.1% quantum efficiency at 259 nm. Moreover, the quantum efficiency of this cathode versus operation time can be fitted by an exponential decay curve, which saturates asymptotically to a 1.03% value, suggesting that a quantum efficiency close to 1% could be sustained for very long operation times. Films degraded by use can be recovered to a quantum efficiency which is close to the initial value, by heating the substrate at temperatures between 100 and 330 °C. A new procedure to obtain K–Te cathodes with high (up to 11%) quantum efficiencies is described.
Original languageEnglish
Pages (from-to)1384-1387
Number of pages3
JournalJournal of Applied Physics
Volume82
Issue number3
DOIs
Publication statusPublished - 1997

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