Abstract:
In this paper we present two options for a new lattice of
the 1 GeV Duke FEL Storage Ring reducing horizontal beam
emittance from existing 18 nm*rad to 1.4 nm*rad and 0.9
nm*rad respectively. One of proposed lattices reuses
existing magnetic elements, another is based on completely
new design. The use of combined function magnets with
dipole, quadrupole and sextupole components allows us to
keep the ring compact and fit it into existing footprint. 2D
and 3D field simulations for such a magnet showed good
quality of magnetic field. Preliminary results for dynamic
aperture simulations are also presented. We also discuss the
choice of lattice cell and tune advances and the concept of
local compensation of nonlinear aberrations.