K–Te photocathodes: A new electron source for photoinjectors


Bisero, D. and Oerle, B.M. van 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

open access
[img] PDF
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
Science and Technology (TNW)
Research Group:
Link to this item:http://purl.utwente.nl/publications/73819
Official URL:https://doi.org/10.1063/1.365915
Export this item as:BibTeX
HTML Citation
Reference Manager


Repository Staff Only: item control page

Metis ID: 128443