A superconducting magnetic system for the 250 to 500 MeV/Amu booster synchr
otron of the Nuclotron is discussed, The repetition rate of the booster is
1 Hz and the circumference 84 m, There are 32 dipole and 24 quadrupole magn
ets with a "cold" iron yoke and a hollow superconductor winding (NbTi) in t
he accelerator ring. Basic parameters of the magnets,superconducting cable
construction, cryogenic system and cryomagnetic assembly design are present
ed.