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abstract:
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FERMI@elettra is a single-pass FEL user facility
covering the spectral range 100-10 nm. It will be located
near the Italian third generation Synchrotron Light Source
facility ELETTRA and will make use of the existing 1.0
GeV normal conducting Linac [1]. To obtain the high
beam brightness required by the project, the present Linac
electron source will be substituted with a photocathode
RF gun now under development in the framework of a
collaboration between Sincrotrone Trieste (ST) and
Particle Beam Physics Laboratory (PBPL) at UCLA. The
new gun will use an improved design of the 1.6 cell
accelerating structure already developed at PBPL, scaled
to 2998 MHz. We expect that the new gun design will
allow a beam brightness increase by a factor 3-4 over the
older version of the device. Some technical choices of the
new design, including the enhancement of the mode
separation, removal of the RF tuners, full cell
symmetrization to limit the dipole and quadrupole RF
field as well as an improved solenoid yoke design for
multipole field corrections, will be discussed.
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