Design of the magnet for the SPring-8 storage ring

The final design of the lattice main magnets for the SPring-8 storage ring is described. The purpose of the final design is to reduce the production and the operation costs. The main items of alteration for designed parameters are reduction of pole width for dipole magnets, reduction of magnet length and bore radius for quadrupole and sextupole magnets, and simplification of the configuration of sextupole magnets. Reduction of weight is estimated to be nearly 30%, 35%, and 40% for dipole, quadrupole, and sextupole magnets, respectively. Total electric power is reduced about 30%. Power supplies and their control system are also presented.<>