Preservation and Control of Proton Polarization Direction for Spin Experiments at the Nuclotron/JINR

The possibility of conducting experiments with polarized protons at the Nuclotron of the NICA accelerator complex at JINR (Dubna) is under discussion. To preserve polarization during beam acceleration a partial siberian snake is supposed to be used based on dynamic superconducting solenoids developed at JINR. Design options for a solenoid snake in the Nuclotron, both with and without compensation of betatron coupling, have been proposed. Spin orientation control for experiments with an extracted proton beam in a continuous momentum range is achieved with a spin rotator based on longitudinal and transverse magnetic fields, located in the beam transport channel to the external target. At discrete energies, occurring approximately in 0.5 GeV steps, which correspond to integer spin resonances, the polarization direction at internal and external targets can be changed without a spin rotator, applying spin navigators based on weak magnetic fields, located inside the Nuclotron.