Ion Polarization Scheme for MEIC

摘要: The choice of a figure 8 shape for the booster and collider rings MEIC opens wide possibilities preservation ion polarization during beam acceleration as well control at collider's interaction points. As in case accelerators with Siberian snakes, spin tune is energy independent but equal to zero instead one half. figure-8 topology eliminates effect arcs on motion. There appears unique opportunity any particle species including deuterons, using longitudinal fields small integrated strength (weak solenoids). Contrary existing schemes, weak solenoids colliders, can points without essentially beam's orbital characteristics. A universal scheme provides an elegant solution problem completely eliminating resonant depolarization. It allows easily adjust direction location, which becomes necessary when transferring from ring into another or measuring by polarimeters. also easy manipulation point experiment. latter feature set up spin-flipping system reversal time less than second. By compensating coherent part zero-integer resonance strength, arises due errors alignment magnetic element lattice, reduce field integrals few orders magnitude.