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abstract:
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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.
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