| 摘要 |
PROBLEM TO BE SOLVED: To provide a conductive cooling superconducting magnet, having high cooling stability, on which a perpetual current can be allowed to flow. SOLUTION: A superconducting magnet 24, a permanent current switch 31 and the connection intermediate part 33 of the superconducting magnet and the perpetual current switch are cooled by a refrigerator 1. A temperature sensor 35 is provided on the perpetual current switch 31, and the increase ratio of the feeding current of the heater 32 of the perpetual current switch and an external power source 36 is controlled by the signal sent from the temperature sensor 35. |
