| 摘要 |
There is provided a superconducting magnet in which magnetization caused by a shielding current of a superconducting winding is eliminated whereby the current to be supplied to the superconducting winding is uniformized, and thus uniformity of the central magnetic field is secured. The superconducting magnet has a superconducting winding (2) composed of a superconductor, and an outer AC winding (4) composed of a superconductor or non-superconductor wound coaxially with the superconducting winding (2), at an outer side the superconducting winding (2); and an AC current is supplied to the outer AC winding (4) thereby applying an AC magnetic field in a direction perpendicular to a direction of magnetization caused in the superconducting winding (2) by the shielding current, and thus the magnetization is eliminated. Also, the superconducting magnet has an inner AC winding (7) composed of a superconductor or non-superconductor wound coaxially with the superconducting winding (2), at an inner side of the superconducting winding (2) layer; and a direction of a current to be supplied to the outer AC winding (4) and a direction of a current to be supplied to the inner AC winding (7) are to be in opposite directions to each other. |
