Title :
Robust, long-life photocathodes
Author :
R. Lawrence Ives;Eric Montgomery;Lou Falce;George Collins;David Marsden;Thuc Bui
Author_Institution :
Calabazas Creek Research, Inc., 690 Port Drive, San Mateo, CA USA
Abstract :
Calabazas Creek Research, Inc. and the University of Maryland are developing high quantum efficiency (QE) reservoir cathodes for accelerators, free-electron lasers, ultra-fast electron microscopes and other applications. High QE materials are deposited on an emitter allowing diffusion of cesium from a reservoir. An integral heater provides a continuous flow of cesium to replace that lost by evaporation, thereby extending the lifetime of the cathode. Experiments demonstrated these cathodes can recover from poisoning events, including atmospheric contamination for some cathodes. A facility is nearing completion to fabricate the cathodes, including equipment for vacuum transport to user facilities.
Keywords :
"Cathodes","Cesium","Reservoirs","Coatings","Tungsten","Radio frequency","Surface treatment"
Conference_Titel :
Infrared, Millimeter, and Terahertz waves (IRMMW-THz), 2015 40th International Conference on
Electronic_ISBN :
2162-2035
DOI :
10.1109/IRMMW-THz.2015.7327881