Computer studies of a combined-function bend magnet for a proposed redesign of the SLAC SLC damping rings

A proposed redesign of the SLAC SLC Damping Ring requires a combined-function bending magnet. The magnet will operate with a main field of 1.8338 T, and quadrupole and sextupole gradients dB_Y/dx, d²B_y/dx² of -14.1 T/m and -477 T/m², respectively. Because the orbit sagitta in the magnet is in excess of 2 cm, the pole will be curved with a 2 m radius of curvature. Furthermore, since the current must be variable over a range of ±2 percent, we have considered using vanadium permendur poles to avoid adverse saturation effects. Studies were done using POISSON in 2-D and TOSCA for 3-D end effects