| 摘要 |
PROBLEM TO BE SOLVED: To speed up heat conduction, to reduce the heat capacity of a heat conductive path, and to avoid the increase of AC loss by the reduction of the heat capacity of the heat conductive path. SOLUTION: This system is composed of an annular coil 5 having superconductivity, a refrigeration body 4 for cooling the coil 5, and a heat conductor 6 interposed between the coil 5 and the refrigeration body 4. The heat conductor 6 is equipped with a circumferential heat conductive section 12 thermally joined with the coil 5, and a plurality of radial heat conductive sections 13 thermally coupled with the refrigeration body 4 and thermally coupled with the circumferential heat conductive section 12, extending radially from the refrigeration body 4. The heat of the coil 5 in a peripheral region flows concentrically from a high-temperature region to a low-temperature region toward the refrigeration body 4. The region of concentration of its flow is a region at lower temperature, and higher-speed cooling becomes possible, skillfully making use of the physical properties that the capacity Q of heat conduction becomes larger when the temperature fall T is larger. |
