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.
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1 August 1997
Research Article|
August 01 1997
K–Te photocathodes: A new electron source for photoinjectors
D. Bisero;
D. Bisero
NCLR, Post Office Box 2662, 7500 CR Enschede, The Netherlands
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B. M. van Oerle;
B. M. van Oerle
NCLR, Post Office Box 2662, 7500 CR Enschede, The Netherlands
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G. J. Ernst;
G. J. Ernst
University of Twente, Department of Applied Physics, Post Office Box 217, 7500 AE Enschede, The Netherlands
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J. W. J. Verschuur;
J. W. J. Verschuur
University of Twente, Department of Applied Physics, Post Office Box 217, 7500 AE Enschede, The Netherlands
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W. J. Witteman
W. J. Witteman
University of Twente, Department of Applied Physics, Post Office Box 217, 7500 AE Enschede, The Netherlands
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D. Bisero
B. M. van Oerle
G. J. Ernst
J. W. J. Verschuur
W. J. Witteman
NCLR, Post Office Box 2662, 7500 CR Enschede, The Netherlands
J. Appl. Phys. 82, 1384–1387 (1997)
Article history
Received:
November 18 1996
Accepted:
April 29 1997
Citation
D. Bisero, B. M. van Oerle, G. J. Ernst, J. W. J. Verschuur, W. J. Witteman; K–Te photocathodes: A new electron source for photoinjectors. J. Appl. Phys. 1 August 1997; 82 (3): 1384–1387. https://doi.org/10.1063/1.365915
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