| 摘要 |
PROBLEM TO BE SOLVED: To continue an operating state of a superconductive electromagnet by automatically separating thermal contact between a superconductive coil and a cryogenic refrigerator without needing a worker at power outage.SOLUTION: A cryogenic refrigerator thermal switch includes: a space part providing spaces 41 and 44 around cylinders 12 and 14 of a cryogenic refrigerator 10; a double bellows pipe structure 31 providing a space 43 annularly around the space part by bellows pipes 31a and 31b extending and contracting according to the atmospheric pressure; a gas connection path 42 for connection between the spaces 41 and 43; and thermal switching parts 27 and 28 for thermally contacting the cryogenic refrigerator 10 and the superconductive coil when the double bellows pipe structure 31 is contracted, and separating the thermal contact when extended. The double bellows pipe structure 31 extends at power outage, thus allowing the thermal contact between the cryogenic refrigerator 10 and the superconductive coil to be automatically separated. |
