Project of the VEPP-4M modification for experiments with longitudinally polarized beams

A proposal concerning the VEPP-4M storage ring experimental internal modification for producing longitudinal spin orientation of electrons and positros at the colliding point is described. The longitudinal polarization method is based on the approach using solenoid spin rotators. In this sceme the vertical polarization direction is at first transferred into the horizontal one by the solenoid longitudinal magnetic field and then it is transferred into the longitudinal direction by the roation by 90 deg in a magnet with the vertical magnetic field. The symmetrical part of the scheme is used for the reconstruction of the vertical polarization direction