• W. Wittmer, M.H. Donald, Y. Nosochkov, U. Wienands, G. Yocky
  SLAC, Menlo Park, California
• M.E. Biagini, P. Raimondi
  INFN/LNF, Frascati (Roma)
• A.V. Bogomyagkov, I. Koop, S.A. Nikitin
  BINP SB RAS, Novosibirsk

The proposed SuperB factory will provide longitudinal polarized electrons to the experiment. Vertically polarized electrons will be injected into the High Energy Ring; the vertical spin orientation will be locally rotated into the longitudinal direction before the interaction point and back afterwards to avoid spin depolarization. The spin rotators can be designed using compensated solenoids–-as proposed by Zholents and Litvinenko–-to rotate the spin into the horizontal plane, followed by dipoles for horizontal spin rotation into the longitudinal direction. Such spin rotators have been matched into the existing lattice and combined with the crab-waist IR. Several ways of achieving this are explored, that differ in the degree of spin matching achieved and the overall geometry of the interaction region. The spin rotation can also be achieved by a series of dipole magnets only, which present a different optical matching problem. We will compare the different scenarios leading up to the adopted solution.

• P.A. Piminov, A.V. Bogomyagkov, E.B. Levichev
  BINP SB RAS, Novosibirsk
• M.E. Biagini, P. Raimondi, M. Zobov
  INFN/LNF, Frascati (Roma)

A project of the SuperB Factory in Italy with the crab-waist collision scheme and extremely large luminosity addresses new challenges to the nonlinear beam dynamics study. Among these challenges are: low emittance lattice requiring strong sextupoles for chromatic correction, sub-mm vertical betatron function at the IP, crab sextupoles placed at both sides from the IP, etc. In this report we describe the results of the DA limiting sources analysis and optimization of the arrangement of the IR and Crab sextupoles and octupoles for the Low Energy Ring (LER).

• P.A. Piminov, V.E. Blinov, A.V. Bogomyagkov, S.E. Karnaev, G.V. Karpov, V.A. Kiselev, S.A. Krutikhin, G.Y. Kurkin, E.B. Levichev, O.I. Meshkov, S.V. Motygin, S.A. Nikitin, I.B. Nikolaev, V.N. Osipov, V.M. Petrov, E. Rotov, E. Shubin, V.V. Smaluk, G.M. Tumaikin, A.N. Zhuravlev
  BINP SB RAS, Novosibirsk

The VEPP-4M electron-positron collider is now operating with the KEDR detector for high-energy physics experiments in the 1.5−2.0 GeV beam energy range. Parallel with these experiments, the VEPP-4M scientific team carries out a number of accelerator physics investigations. A new registration system for the Touschek polarimeter has been put into operation. A new NMR-based system for suppression of the guide field ripples has been developed. The counting rate of the Touschek particles has been measured as a function of the beam energy in the range from 1.85 to 4 GeV. The measurement results can be claimed at the future super B and C-Tau factories. For simultaneous measurement of the transverse beam position and inclination angle an X-ray multi-pinhole camera has been designed, manufactured and installed at the VEPP-4M. To suppress the longitudinal instability caused by high-order modes of the RF cavities, a feedback system has been developed.