| 摘要 |
PROBLEM TO BE SOLVED: To provide a passive shield type superconducting magnet for generating the static magnetic field of a small leakage magnetic field and high magnetic field uniformity without enlarging the entire device by efficiently arranging a ferromagnetic body for a magnetic shield. SOLUTION: In this magnet, static magnetic field generation sources 2 are arranged in a vertical direction holding an uniform magnetic field area 1 there between and a magnetic shield plate 6 and a yoke 7 for constituting the magnetic shield are arranged around them. The magnetic shield plate 6 and the yoke 7 are magnetically coupled at a junction part 12. On the surface side facing the static magnetic field generation source 2 of the magnetic shield plate 6 near the junction part 12, the ferromagnetic body 10 provided with a bevel slope 11 is attached so as to be in contact with the magnetic shield plate 6 and the yoke 7. In the constitution, a magnetic flux line 14 is passed through a ferromagnetic body piece 10 and the magnetic flux line 14 is distributed at high density near the static magnetic field generation source 2 of the magnetic shield plate 6 as the whole. |
