Patent ID: 7253624

Claim:
A magnet system comprising: a first magnet body, having a first cylindrical hollow, in which a first group of superconductive coils are incorporated, a second magnet body, having a second cylindrical hollow and being arranged opposing the first magnet body, in which a second group of superconductive coils are incorporated, plurality of strip-shaped magnetic shims for adjusting magnetic-field homogeneity of a homogeneous static-magnetic-field space region formed on each of the first magnet body and the second magnet body, a first ring-shaped magnetic shim arranged in the first cylindrical hollow of the first magnet body, concentrically with the first group of superconductive coils; a second ring-shaped magnetic shim arranged inside the first ring-shaped magnetic shim, concentrically with the first group of superconductive coils; a third ring-shaped magnetic shim arranged in the second cylindrical hollow of the second magnet body, concentrically with the second group of superconductive coils and is arranged opposing the first ring-shaped magnetic shim; and a fourth ring-shaped magnetic shim arranged inside the third ringshaped magnetic shim, concentrically with the second group of superconductive coils, and arranged opposing the second ring-shaped magnetic shim.