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The FINDER photoinjector

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

2007 / IEEE / 978-1-4244-0916-7


This item was taken from the IEEE Conference ' The FINDER photoinjector ' The FINDER photoinjector was developed for the inverse Compton scattering experiment under UCLA-LLNL collaboration. The improvements of this gun from SPARC gun [1, 2] 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.