For short, high-intensity electron bunches, alkali-tellurides have proved to be a reliable photo-cathode material. Measurements of lifetimes in an RF gun of the CLIC Test Facility II at field strengths greater than 100 MV/m are presented. Before and after using them in this gun, the spectral response of the Cs-Te and Rb-Te cathodes were determined with the help of an optical parametric oscillator. The behaviour of both materials can be described by Spicer's 3-step model. Whereas during the use the threshold for photo-emission in Cs-Te was shifted to higher photon energies, that of Rb-Te did not change. Our latest investigations on the stoichiometric ratio of the components are shown. The preparation of the photo-cathodes was monitored with 320 nm wavelength light, with the aim of improving the measurement sensitivity. The latest results on the protection of Cs-Te cathode surfaces with CsBr against pollution are summarized. New investigations on high mean current production are presented.
@article{arxiv.physics/0008061,
title = {Production And Studies Of Photocathodes For High Intensity Electron Beams},
author = {E. Chevallay and S. Hutchins and P. Legros and G. Suberlucq and H. Trautner},
journal= {arXiv preprint arXiv:physics/0008061},
year = {2011}
}
Comments
Submission to LINAC2000 conference, Paper number MOB08, 3 pages, 6 figures