Spin flipping in rings with Siberian Snakes II: Simulations with localized orbit excursions

A new program eilms is used to perform spin tracking simulations, for spin flippers in model rings with full strength Siberian Snakes, at a spin tune of 1 2 . eilms employs canonical variables and symplectic–unitary integrators for all beamline elements. In particular, tracking studies are presented for a new design of a spin flipper proposed for stored polarized proton beams in RHIC. The induced coherent vertical betatron oscillations are localized within the flipper system. Points of detail which require further study are elucidated.