SUPERCONDUCTING MAGNET DEVICE COOLED BY REFRIGERATOR

PROBLEM TO BE SOLVED: To improve reliability and maintainability by enabling a refrigerator, current leads and a superconducting coil to separate, and to accomodata them separately in containers for maintaining the regrigerator and the current leads separately from the superconducting coil. SOLUTION: A superconducting magnet device 20 cooled by a refrigerator is provided with a first vacuum heat insulating space 24 in a vacuum container 21 and a second vacuum heat insulating space 25 in a heat shield plate 22. A third vacuum heat insulating space 26 is provided in a unit container 23 of low thermal conducting material such as stainless steel, GFRP or the like. High-temperature side/low-temperature side cooling stages 9 and 10, a copper current lead 7 and a superconducting current lead 8 are provided in a vacuum sealing portion of a sealing member 35 with maintaining vacuum sealing in a range where they are not in contact with separating parts in the unit container 23 side. A high-temperature side separating member 41 makes the high- temperature side cooling stage 9 and the heat shield plate 22 separably and thermally in contact. The low-temperature side separating member 43 makes the cooling stage 10 and the superconducting coil 6 separably and thermally in contact through a heat conducting member 42.