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

fYear

2014

fDate

22-24 April 2014

Firstpage

131

Lastpage

132

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Vacuum Electronics Conference, IEEE International

Conference_Location

Monterey, CA

Type

conf

DOI

10.1109/IVEC.2014.6857524

Filename

6857524