K–Te photocathodes: A new electron source for photoinjectors

Bisero, D. and Oerle van, B.M. and Ernst, G.J. and Verschuur, J.W.J. and Witteman, W.J. (1997) K–Te photocathodes: A new electron source for photoinjectors. Journal of Applied Physics, 82 (3). pp. 1384-1387. ISSN 0021-8979

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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.
Item Type:	Article
Copyright:	© 1997 American Institute of Physics
Faculty:	Science and Technology (TNW)
Research Group:	Laser Physics and Nonlinear Optics (LPNO)
Link to this item:	http://purl.utwente.nl/publications/73819
Official URL:	http://dx.doi.org/10.1063/1.365915
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