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Eyser, O.

Paper Title Page
FRPMS112 Absolute Measurement of the Polarization of High Energy Proton Beams at RHIC 4369
  • Y. Makdisi, A. Bravar, G. Bunce, R. L. Gill, H. Huang, A. Khodinov, A. Kponou, Z. Li, W. Meng, A. N. Nass, S. Rescia, A. Zelenski
    BNL, Upton, Long Island, New York
  • I. G. Alekseev, D. Svirida
    ITEP, Moscow
  • M. Chapman, W. Haeberli, T. Wise
    UW-Madison/PD, Madison, Wisconsin
  • S. Dhawan
    Yale University, Physics Department, New Haven, CT
  • O. Eyser
    UCR, Riverside, California
  • O. Jinnouchi, I. Nakagawa
    RBRC, Upton, Long Island, New York
  • H. Okada, N. Saito
    Kyoto University, Kyoto
  • E. J. Stephenson
    IUCF, Bloomington, Indiana
  Funding: Work supported by the Department of Energy Contract no. DE-AC02-98CH10886 and the RIKEN BNL Research Center.

The spin physics program at the Relativistic Heavy Ion Collider (RHIC) requires knowledge of the proton beam polarization to better than 5%. To achieve this goal, a polarized hydrogen jet target was installed in RHIC where it intersects both beams. The premise is to utilize the precise knowledge of the jet proton polarization to measure the analyzing power in the proton - proton elastic scattering process in the Coulomb Nuclear Interference (CNI) region at the prescribed RHIC proton beam energy, then use the reverse reaction to measure the degree of the beam polarization, and finally confront the results with simultaneous measurements by the fast high statistics polarimeter that measure the p-Carbon elastic scattering process in the CNI region to calibrate the latter. In this presentation, the polarized jet target mechanics, operation, detector systems and the p-Carbon polarimeter are described. The statistical accuracy attained as well as the systematic uncertainties will be discussed. Such techniques may well become the standard for high energy polarized proton beams planned elsewhere in Russia and Japan.