The FINDER photoinjector

Author

Fukasawa, A. ; Badakov, H. ; Shea, B. D O ; Hemsing, E. ; Rosenzweig, J.B. ; Anderson, S.G.

Author_Institution

UCLA, Los Angeles

fYear

2007

fDate

25-29 June 2007

Firstpage

1260

Lastpage

1262

Abstract

The FINDER photoinjector was developed for the inverse Compton scattering experiment under UCLA-LLNL collaboration. The improvements of this gun from SPARC gun at INFN-LNF (Frascati) and previous UCLA versions of the 1.6 cell S-band photoinjector are detailed here. The gun is designed to have large mode separation to suppress 0 mode excitation which may be a cause of the emittance degradation. In an effort to reduce the RF quadrupole effect the full cell tuners are replaced by vacuum ports. The laser ports are also omitted. Two openings of the solenoid shield are added to top and bottom of it where there were only two openings on the sides. S₁₁ of the cavity was presented. The on-axis electric field was measured by the bead drop method to show the good field balance. The magnetic field in the emittance compensation solenoid was measured and the quadrupole components were derived.

Keywords

Compton effect; accelerator RF systems; accelerator cavities; electron accelerators; electron beams; electron guns; linear accelerators; particle beam injection; photocathodes; solenoids; 1.6 cell S-band photoinjector; BNL-SLAC-UCLA 1.6-cell RF gun cavity; FINDER photoinjector; Frascati; INFN-LNF; RF quadrupole effect; SPARC gun; UCLA-LLNL collaboration; bead drop method; emittance beam degradation; emittance compensation solenoid; full cell tuners; inverse Compton scattering experiment; large mode separation; laser ports; magnetic field; on-axis electric field; photocathode drive laser; quadrupole components; vacuum ports; Collaboration; Degradation; Laser excitation; Laser modes; Laser tuning; Magnetic field measurement; Radio frequency; Scattering; Solenoids; Tuners;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2007. PAC. IEEE

Conference_Location

Albuquerque, NM

Print_ISBN

978-1-4244-0916-7

Type

conf

DOI

10.1109/PAC.2007.4441049

Filename

4441049