Title :
An in-situ photocathode loading system for the SLC Polarized Electron Gun
Author :
Kirby, R.E. ; Collet, G.J. ; Skarpaas, K.
Author_Institution :
Stanford Linear Accel. Center, Stanford Univ., CA, USA
Abstract :
An ultra-high vacuum loadlock system capable of operating at high voltage has been added to the SLC Polarized Electron Gun. The unit incorporates facilities for heat cleaning, activating and measuring the quantum efficiency of photocathodes. A tray of up to four photocathodes can be exchanged without bringing the activation unit or gun up to atmosphere. Low voltage quantum efficiencies of 20% have been obtained for bulk GaAs at 633 nm and 6% for a 0.3 micron GaAs layer at 755 nm. Results for other cathodes as well as operational characteristics are discussed
Keywords :
electron guns; gallium arsenide; photocathodes; vacuum apparatus; 0.3 micron; 633 nm; 755 nm; GaAs; GaAs layer; Polarized Electron Gun; SLC; bulk GaAs; heat cleaning; photocathode loading system; photocathodes; quantum efficiency; ultra-high vacuum loadlock system; Atmosphere; Atmospheric measurements; Breakdown voltage; Cathodes; Cooling; Electron beams; Electron tubes; Gallium arsenide; Polarization; Valves;
Conference_Titel :
Particle Accelerator Conference, 1993., Proceedings of the 1993
Conference_Location :
Washington, DC
Print_ISBN :
0-7803-1203-1
DOI :
10.1109/PAC.1993.309540
