| 摘要 |
Uniformity of magnet field can be easily adjusted. A superconductive magnet device comprises a pair of oppositely disposed superconductive magnet bodies 27, 31 in which annular superconductive coils 26, 30 are accommodated, and fine chip-shaped ferromagnetic shims 51, 52 disposed on a surface of the pair of superconductive magnet bodies 27, 31, so as to improve uniformity of magnetic field in a uniform magnetic field space generated in the proximity of the center between the superconductive magnet bodies 27, 31 by the fine chip-shaped ferromagnetic shims 51, 52, wherein ring-shaped ferromagnetic shims 45~50 are disposed concentrically with the center of the annular superconductive coils 26, 30 on the surface of the superconductive magnet bodies 27, 31.
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