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The choice of a figure 8 shape for the booster and collider rings of MEICopens wide possibilities for preservation of the ion polarization during beamacceleration as well as for control of the polarization at the collider'sinteraction points. As in the case of accelerators with Siberian snakes, thespin tune is energy independent but is equal to zero instead of one half. Thefigure-8 topology eliminates the effect of arcs on the spin motion. Thereappears a unique opportunity to control the polarization of any particlespecies including deuterons, using longitudinal fields of small integratedstrength (weak solenoids). Contrary to existing schemes, using weak solenoidsin figure-8 colliders, one can control the polarization at the interactionpoints without essentially any effect on the beam's orbital characteristics. Auniversal scheme for control of the polarization using weak solenoids providesan elegant solution to the problem of ion acceleration completely eliminatingresonant beam depolarization. It allows one to easily adjust the polarizationin any direction at any orbital location, which becomes necessary whentransferring the beam from one ring into another or when measuring thepolarization by polarimeters. It also allows for an easy manipulation of thespin direction at an interaction point during an experiment. The latter featureallows one to set up a spin-flipping system with a spin reversal time of lessthan a second. By compensating the coherent part of the zero-integer spinresonance strength, which arises due to errors in alignment of the magneticelement of the lattice, one can reduce the field integrals of the controlsolenoids by a few orders of magnitude.

Ion Polarization Scheme for MEIC