The optical design of the spin manipulation system for the SLAC linear collider

The optical design of the beam transport lines between the SLAC (Stanford Linear Accelerator Center) linac and the electron damping ring and the design of part of the linac lattice itself will be modified to accommodate three superconducting solenoids for the purpose of manipulating the polarization of the electron beam. In order to allow arbitrary orientation of the polarization vector, this design will be capable of compensating the fields of two independent solenoids for arbitrary strengths ranging to 7.0 T-m. The method of dealing with the coupling of the betatron functions and the method of handling both the electron and the positron beams in the common region are discussed. If these beams have equal transverse emittance the transverse coupling will not affect the observed spot sizes