Development of a polarized electron gun based on an S-band PWT photoinjector

Author

Yu, D. ; Newsham, D. ; Luo, Y. ; Smirnov, A. ; Clendenin, J. ; Schultz, D.

Author_Institution

DULY Res. Inc., Rancho Palos Verdes, CA, USA

Volume

3

fYear

2003

Firstpage

2129

Abstract

An RF polarized electron gun utilizing the unique features of an integrated, plane-wave-transformer (PWT) photoelectron injector is being developed by DULY Research Inc. in collaboration with SLAC. Modifications to a DULY S-band device include: a re-design of the photocathode/RF backplane interface to accommodate a GaAs cathode; change in the design of the vacuum ports to provide 10^-11 Torr operation; the inclusion of a load-lock photocathode replacement system to allow for reactivation and cesiation of the GaAs photocathode in a vacuum; and alteration of the magnet field coils to make room for the load-lock. The use of a stainless steel outer tank and cooling rods without copper plating may also provide better vacuum performance at the expense of diminished Q-factor. The effectiveness of both the standard cooling rods and synthetic diamond heat sinks for disk cooling is investigated for future linear collider applications operating at a rep rate of 180 Hz and a bunch charge of 2 nC.

Keywords

Q-factor; accelerator RF systems; electron guns; electron sources; linear accelerators; particle beam bunching; particle beam injection; photocathodes; vacuum apparatus; 180 Hz; 1E-9 torr; DULY S-band device; GaAs cathode; Q-factor; RF polarized electron gun; S-band PWT photoinjector; bunch charge; cooling rods; disk cooling; linear collider applications; load-lock photocathode replacement system; magnet field coils; photocathode/RF backplane interface; plane-wave-transformer photoelectron injector; stainless steel outer tank; synthetic diamond heat sinks; vacuum; vacuum ports; Backplanes; Cathodes; Collaboration; Cooling; Electrons; Gallium arsenide; Magnetic devices; Polarization; Radio frequency; Vacuum systems;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the

ISSN

1063-3928

Print_ISBN

0-7803-7738-9

Type

conf

DOI

10.1109/PAC.2003.1288806

Filename

1288806