Abstract:
After generating the first femto-second X-ray pulses at the
Advanced Light Source (ALS), it becomes
critical to improve the flux of this femto-second source for
user experiments. A narrow-gap in-vacuum
undulator has been proposed to be installed in one of the
ALS straight sections. To realize the optimal
performance of this undulator, a straight section lattice
with a mini vertical beta function has been designed.
Separation of electrons has been achieved by generating a
sizable vertical dispersion via a local dispersion
bump and a closed orbit bump. Particle tracking study shows
that the modified ALS lattice for the
femto-second X-ray source has an adequate dynamic aperture.