Title :
On the photocathodes used at the TTF photoinjector
Author :
Schreiber, S. ; Michelato, P. ; Monaco, L. ; Sertore, D.
Author_Institution :
DESY, Hamburg, Germany
Abstract :
Since the start-up of the laser driven rf gun based photoinjector at the TESLA Test Facility (TTF) late 1998, several cathodes have been used. We report on the properties of Cs2Te and KCsTe cathodes under operating conditions, their quantum efficiency and lifetime. Darkcurrent emitted by the RF gun or the cathodes have been a major concern in the first year of operation. Meanwhile, new cathode production techniques and a conditioning effect of the RF gun has reduced the darkcurrent significantly.
Keywords :
accelerator RF systems; caesium compounds; electron accelerators; electron beams; electron guns; linear accelerators; particle beam diagnostics; particle beam injection; particle beam stability; photocathodes; potassium compounds; 1998; Cs2Te; Cs2Te cathodes; KCsTe; KCsTe cathodes; TESLA Test Facility; TTF photoinjector; cathode production techniques; darkcurrent; laser driven rf gun; lifetime; operating conditions; photocathodes; quantum efficiency; Cathodes; Free electron lasers; Laser mode locking; Optical pulses; Plugs; Pulse measurements; Radio frequency; Solid lasers; Tellurium; Test facilities;
Conference_Titel :
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the
Print_ISBN :
0-7803-7738-9
DOI :
10.1109/PAC.2003.1288782
