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Proposal of partial Siberian snake based on helical magnets for AGS

Koop I. A., Otboev A. V., Perevedentsev E. A., Shatunov P. Yu, Shatunov Yu M.

A scheme of partial Siberian snake is considered for polarized proton acceleration at AGS. The snake consists of four identical helical magnets with the field amplitude about 4.0 T on axis and provides proton spin rotation by about 32 degrees per one pass at the injection energy 2.5 GeV. Orbit distortions do not exceed 2 cm inside the insertion. The influences of the snake fields' nonlinearities on the beam dynamics are discussed.