  The Stanford Synchrotron Radiation Laboratory is investigating an accelerator
upgrade project that would replace the present 130 nm rad FODO lattice with an
18 nm rad double bend achromat (DBA) lattice: SPEAR 3. The low emittance design
yields a high brightness beam, but the stronger focusing in the DBA lattice
increases chromaticity and beam sensitivity to machine errors. To ensure
efficient injection and long Touschek lifetime, an optimization of the design
lattice and dynamic aperture has been performed. In this paper, we review the
methods used to maximize the SPEAR 3 dynamic aperture including necessary
optics modifications, choice of tune and phase advance, optimization of
sextupole and coupling correction, and modeling effects of machine errors,
wigglers and lattice periodicity.
