| 摘要 |
PROBLEM TO BE SOLVED: To well cool an entire of a superconductive wiring of a perpetual current switch by heat conduction by connecting a spool by a single material of a perpetual current switch to a cooling source. SOLUTION: A perpetual current switch 6 is constituted of a spool 1, a superconductive wire 2, an inner insulation layer 3, a heater wire 4 and an outer insulation layer 5. The spool 1 is fixed in contact with an extremely low temperature cooling stage 7 which is cooled by a freezer in an outside to enable heat conduction and is fixed by a metal part 8. The perpetual current switch 6 is fixed in contact with the extremely low temperature cooling stage 7 formed of a metallic member of good heat conductivity to enable heat conduction and the extremely low temperature cooling stage 7 is connected to an extremely low temperature cooling head of a compact freezer and is cooled down to a temperature in the neighborhood of 4K. Therefore, since a superconductive wiring part is cooled well by improving heat conduction characteristic of a spool and a wiring is subjected to uniform temperature rise and cooling, OFF operation is possible by little heat input to a heater, thus reducing cooling load of a freezer.
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