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Mac Kay, W.

Paper Title Page
TPAP044 Observations of Snake Resonance in RHIC 2839
 
  • M. Bai, H. Huang, W. Mac Kay, V. Ptitsyn, T. Roser, S. Tepikian
    BNL, Upton, Long Island, New York
  • S.-Y. Lee, F. Lin
    IUCF, Bloomington, Indiana
 
  Funding: The work was performed under the auspices of the U.S. Department of Energy.

Siberian snakes now become essential in the polarized proton acceleration. With proper configuration of Siberian snakes, the spin precession tune of the beam becomes $\frac{1}{2}$ which avoids all the spin depolarizing resonance. However, the enhancement of the perturbations on the spin motion can still occur when the betatron tune is near some low order fractional numbers, called snake resonances, and the beam can be depolarized when passing through the resonance. The snake resonances have been confirmed in the spin tracking calculations, and observed in RHIC with polarized proton beam. Equipped with two full Siberian snakes in each ring, RHIC provides us a perfect facility for snake resonance studies. This paper presents latest experimental results. New insights are also discussed.