Progress on a cryogenically cooled RF gun polarized electron source

Conference · Tue Aug 01 04:00:00 EDT 2006

OSTI ID:897047

Fliller, III, R P; Edwards, H

RF guns have proven useful in multiple accelerator applications. An RF gun capable of producing polarized electrons is an attractive electron source for the ILC or an electron-ion collider. Producing such a gun has proven elusive. The NEA GaAs photocathode needed for polarized electron production is damaged by the vacuum environment in an RF gun. Electron and ion back bombardment can also damage the cathode. These problems must be mitigated before producing an RF gun polarized electron source. In this paper we report continuing efforts to improve the vacuum environment in a normal conducting RF gun by cooling it with liquid nitrogen after a high temperature vacuum bake out. We also report on a design of a cathode preparation chamber to produce bulk GaAs photocathodes for testing in such a gun. Future directions are also discussed.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 897047
• Report Number(s): FERMILAB-CONF-06-273-AD
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
Accelerators
CATHODES
DESIGN
ELECTRON SOURCES
ELECTRONS
LINEAR ACCELERATORS
NITROGEN
PHOTOCATHODES
PRODUCTION
TESTING