| 摘要 |
PROBLEM TO BE SOLVED: To obtain a superconducting apparatus in which the introduction of heat into an inner chamber at a vacuum container is reduced by a method wherein a disconnector at a current supply device is installed in a region at the end part of its room-temperature-side end part. SOLUTION: A refrigerator 6 which indirectly cools a magnet device 5 is constituted of a room-temperature-side refrigerator part 6a situated inside a room-temperature range RT and of a very-low-temperature-side refrigerator part 6b which comprises both refrigeration stages 7, 8 and which is extended into a very-low-temperature range TT. The very-low-temperature-side refrigerator part 6b is passed airtightly into an inner chamber 4 evacuated to an insulating vacuum residual pressure (p) through an opening part 10 in a vacuum container 3. In addition, at the very-low- temperature-side end part of the refrigeration stage 8, the very-low-temperature refrigerator part 6b is coupled thermally to the magnet device 5 to be cooled. Then, a room- temperature-side lead part 12a at a current supply device 12 is passed through an opening part 15 in a radiation shielding body 16 which is coupled thermally to the refrigeration stage 7 at the refrigerator 6, and it is connected to a contact piece 17a at a disconnector 17. When the disconnector 17 is closed, a contact piece 17b is inserted into the contact piece 17a. Thereby, when the disconnector is closed, a thermal shock to the refrigerator is reduced. |
