Abstract
The Hefei Advanced Light Facility (HALF) is a soft X-ray
diffraction-limited storage ring being designed with an energy of
about 2.2 GeV and an emittance goal of less than 100 pm·rad.
The present HALF lattice is a modified hybrid six-bend-achromat
(6BA) lattice with a long and a short straight section in each
cell. In this paper, a 7BA lattice is designed for HALF as a
promising option, which follows the main feature of hybrid 7BA
lattice, but to have a compact configuration and lower emittance,
all bends in this lattice are combined-function bends and reverse
bends. The designed HALF storage ring has a circumference of
388.8 m and 20 identical cells. Two solutions with different
betatron tunes are studied for this lattice. One with smaller tunes
has better nonlinear dynamics performance allowing for off-axis
injection, which has a natural emittance of 67 pm·rad. The
other with larger tunes has very small beta functions at the
straight section as well as lower natural emittance of 59
pm·rad, which can enhance the brightness of insertion device
(ID) radiation. The intra-beam scattering effect and ID radiation
properties are also presented in this paper.
Tracking studies of insertion device effects on dynamic aperture in the APS storage ring
