| 摘要 |
PURPOSE:To facilitate cooling a supercorducting magnet while the temperature difference between the superconducting magnet and circulated nitrogen gas is being maintained approximately constant by a method wherein a heat exchanger which facilitates beat exchange between the circulated nitrogen gas from an LN2 cooler and the circulated nitrogen gas returned from a cryostat is provided. CONSTITUTION:A liquid nitrogen bath 1 in which liquid nitrogen 3 is contained and an LN2 cooler 7 which is immersed in the liquid nitrogen and cools the circulated nitrogen gas transferred by the operation of a compressor 5 by heat exchange between the circulated nitrogen gas and the liquid nitrogen 3 are provided to cool a superconducting magnet 10 provided in a cryostat 8 by using the circulated nitrogen gas. 1st heat exchanger 22, which facilitates heat exchange between the circulated nitrogen gas from the LN2 cooler 7 and the circulated nitrogen gas returned from the cryostat 8 after cooling the superconducting magnet 10, is provided between the LN2 cooler 7 and the cryostat 8 in such a cryogenic cooler. With this constitution, the superconducting magnet can be cooled while the temperature difference between the superconducting magnet and the circulated nitrogen gas is being maintained approximately constant without adjusting the opening of a regulating valve during the cooling of the superconducting magnet.
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