TEMPERATURE RISING METHOD OF SUPERCONDUCTING APPARATUS AND TEMPERATURE RISING DEVICE

PROBLEM TO BE SOLVED: To provide a temperature rising method with which, when maintaining a superconducting apparatus which is cooled by a liquid coolant while being accommodated in an extra-low-temperature vessel, the required time for rise of temperature can be shortened while accommodating the superconducting apparatus in the extra-low-temperature vessel.SOLUTION: A temperature rising method is provided for a superconducting apparatus 1 which is accommodated in an extra-low-temperature vessel 2, immersed in a liquid coolant (liquid nitrogen) and operated while being cooled to an extra-low temperature by the liquid coolant. According to the method, in the state where operation of the superconductive apparatus 1 is stopped and further the liquid coolant is driven out by supplying the same kind of gas (nitrogen gas) as the liquid coolant from the outside to the extra-low-temperature vessel 2 with pressure, as a heat medium for temperature rising, the gas filling the extra-low-temperature vessel is forcibly circulated and conducted through a gas-air heat exchanger 10, an air pump 11 and pipes 12, 13, and 14 of a circulation circuit, such that the temperature of the superconducting apparatus rises to near the ambient room temperature.