• F. Lin, A.U. Luccio, N. Malitsky, W. Morse, Y. Semertzidis
  BNL, Upton, Long Island, New York
• C.J. Onderwater
  KVI, Groningen
• Y.F. Orlov, R.M. Talman
  CLASSE, Ithaca, New York

In the proposed electric dipole moment (EDM) experiment, with an estimated spin coherence time of 10⁰⁰ s, the spin precession due to an EDM of 10^-29 e.cm will produce a change in the vertical spin component of approximately 10 μrad during the storage time. Such high sensitivity needs an extremely high accurate and reliable simulation environment of the beam and spin behavior during the storage time. Therefore, several spin-related accelerator programs have been considered and investigated. The paper surveys the computational algorithms of these approaches and provides their comprehensive analysis from multiple perspectives: accuracy, performance, extensibility, and scope of potential applications.

• V. Schoefer, L. A. Ahrens, K.A. Brown, A.U. Luccio, W.W. MacKay, T. Roser
  BNL, Upton, Long Island, New York

In order to preserve polarization during polarized proton operation for RHIC, two partial Siberian Snakes are employed in the AGS, where a number of strong spin depolarization resonances must be crossed. These Snakes cause a significant distortion to the injection lattice of the AGS and must be included in the on-line model. In this report we discuss the problem of modeling Snakes as optical elements, particularly as madx elements, and present results comparing measurements to the AGS on-line model.