• U. Wienands, Y. Nosochkov, M.K. Sullivan, W. Wittmer
  SLAC, Menlo Park, California
• D.P. Barber
  Cockcroft Institute, Warrington, Cheshire
• M.E. Biagini, P. Raimondi
  INFN/LNF, Frascati (Roma)
• I. Koop, S.A. Nikitin, S.V. Sinyatkin
  BINP SB RAS, Novosibirsk

The availability of longitudinally polarized electrons is an important aspect of the design of the proposed SuperB project at LNF Frascati. Spin rotators are an integral part of the design of the Interaction Region (IR). We have chosen a solenoid-dipole design; at the 4.18 GeV nominal energy this is more compact that a design purely based on dipole magnets. Integration with the local chromaticity correction of the ultra-low beta* IR has been achieved. The spin rotators are symmetric about the Interaction Point, this design saves a significant amount of length as the dipoles become a part of the overall 360 deg. bend. The layout leaves limited opportunity to setup the optics for minimum depolarization; this is acceptable since beam life time in SuperB at high luminosity is only about 5 min and up-to 90% polarized electrons will be injected continuously. In this way an average beam polarization of about 70% is maintained. Simulations and analytic estimates with the DESY code SLICKTRACK and other codes indicate such operation is feasible from a spin-dynamics point of view. The paper will discuss the overall spin-rotator design as well as the spin dynamics in the ring.