Title :
Lifetime and quantum efficiency advances in self-healing controlled porosity reservoir photocathodes
Author :
Montgomery, Eric J. ; Riddick, Blake C. ; Feldman, Donald W. ; Boldin, Alexandra ; Ives, R. Lawrence ; Falce, Louis R.
Author_Institution :
IREAP, Univ. of Maryland, College Park, MD, USA
Abstract :
Electron beams for such applications as free electron lasers demand high brightness, picosecond-pulsed photoemissive electron sources. The controlled porosity reservoir (CPR) photocathode is a self-healing electron photoemitter. Its design is inspired by thermionic dispenser cathodes, offering extended lifetime of the easily-contaminated cesiated surface. We report atmospheric handling and subsequent self-healing and describe efforts underway to increase quantum efficiency (QE) well above the existing 0.1%-class ultraviolet performance of a Cs:W system by using other surface coatings.
Keywords :
electron beams; electrons; free electron lasers; photocathodes; atmospheric handling; electron beams; free electron lasers; picosecond-pulsed photoemissive electron sources; quantum efficiency; self-healing controlled porosity reservoir photocathodes; self-healing electron photoemitter; surface coatings; thermionic dispenser cathodes; Cathodes; Coatings; Free electron lasers; Heating; Reservoirs; Surface treatment; Thermal stability; cesium; controlled porosity reservoir photocathode; dispenser cathode; free electron laser; lifetime; photoemission; quantum efficiency; work function;
Conference_Titel :
Vacuum Electronics Conference, IEEE International
Conference_Location :
Monterey, CA
DOI :
10.1109/IVEC.2014.6857524
