Advances in DC photocathode electron guns

Conference · Wed Jul 01 00:00:00 EDT 1998

DOI:https://doi.org/10.1063/1.58933· OSTI ID:756202

Dunham, Bruce M; Heartmann, P; Kazimi, Reza; Liu, Hongxiu; Poelker, B M; Price, J S; Rutt, P M; Schneider, W J; Sinclair, Charles K

At Jefferson Lab, a DC photoemission gun using GaAs and GaAs-like cathodes provides a source of polarized electrons for the main accelerator. The gun is required to produce high average current with long operational lifetimes and high system throughout. Recent work has shown that careful control of the parameters affecting cathode lifetime lead to dramatic improvements in source operation. These conditions include vacuum and the related effect of ion backbombardment, and precise control of all of the electrons emitted from the cathode. In this paper, the authors will review recent results and discuss implications for future photocathode guns.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Energy Research (ER) (US)
• OSTI ID: 756202
• Report Number(s): DOE/ER/40150-1531; JLAB-ACP-98-02; TRN: US0002739
• Resource Relation: Conference: Conference title not supplied, No location, No date; Other Information: PBD: 1 Jul 1998
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
CEBAF ACCELERATOR
ELECTRON GUNS
PHOTOCATHODES
ELECTRON SOURCES
POLARIZED BEAMS
BEAM CURRENTS
PHOTOEMISSION