Title :
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
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;
Conference_Titel :
Particle Accelerator Conference, 2007. PAC. IEEE
Conference_Location :
Albuquerque, NM
Print_ISBN :
978-1-4244-0916-7
DOI :
10.1109/PAC.2007.4441049
