CERN Accelerating science

Article
Report number	physics/0008061 ; CERN-PS-2000-046-PP ; CLIC-Note-449 ; LINAC2000-MOB08
Title	Production and studies of photocathodes for high intensity electron beams
Author(s)	Chevallay, E. (CERN) ; Hutchins, S. (CERN) ; Legros, P. (CERN) ; Suberlucq, G. (CERN) ; Trautner, H. (CERN)
Publication	2000
Imprint	15 Aug 2000
Number of pages	3
In:	eConf C 000821 (2000) pp.MOB08
In:	20th International Linear Accelerator Conference, Monterey, CA, USA, 21 - 25 Aug 2000, pp.MOB08
Subject category	Accelerators and Storage Rings ; Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN PS
Study	CLIC
Abstract	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.
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