COOLING DEVICE FOR SUPERCONDUCTING MEMBER

摘要

PROBLEM TO BE SOLVED: To prevent reduction in cooling efficiency of a cooling apparatus by preventing heat conduction from the cylinder of a refrigerator to liquid nitrogen and prevent fluctuations in the liquid level of the liquid nitrogen, when the cooling head of the refrigerator is immersed directly in liquid nitrogen, to obtain supercooling liquid nitrogen in the apparatus for cooling a high-temperature superconducting member with the liquid nitrogen at a supercooling temperature. SOLUTION: A heat insulating part is provided around the outer surface of the cylinder of the refrigerator. The heat-insulating part has a vacuum heat-insulated structure or the cylinder is surrounded by a heat-insulating material. Furthermore, the heat-insulating part around the outer surface of the cylinder of the refrigerator is extended to the middle position in the vertical direction of the outer surface of the cooling head. COPYRIGHT: (C)2010,JPO&INPIT