Abstract

A general approach to the analysis of spin motion in realistic accelerator fields is presented. A method of finding the “spin closed orbit” and spin tune in arbitrary field configurations is given. It is shown that spin-orbital resonances perturb the spin motion and can cause depolarization. Methods of safe resonance crossing for protons are presented, including schemes with a few Siberian snakes and spin rotators in the rings. The effects of radiation on the spin of electrons are considered and illustrated by experiences in electron storage rings in the energy range from 500 MeV to 60 GeV.

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