| 摘要 |
PROBLEM TO BE SOLVED: To provide such a cooling system of a superconducting magnet device, in which a pulse pipe refrigerating device can be installed easily and inexpensively to an existing superconducting magnet device almost without remodeling a vacuum insulating container and, even when the refrigerating device is stopped due to a power failure or the trouble, etc., of the refrigerating device, the intrusion of heat from the outside and the evaporated loss of liquid nitrogen or helium can be suppressed and the parts of the refrigerating device can be exchanged easily. SOLUTION: The cooling system for a superconducting magnet device has a liquid helium tank (3) incorporating a superconducting magnet (2) and a liquid nitrogen tank (8) arranged to surround the tank (3) in the vacuum insulated container (1). In the cooling system, a capillary (25) or duplex tube (29) is inserted into at least one of vaporized gas discharge pipes (5 and 10) of the liquid helium or nitrogen tank (3) or (8) and, at the same time, the upper end section of the capillary (25) or tube (29) is opened in a recondensing chamber (24) which is cooled by means of the cold head (21) of the low-temperature generating section of the pulse pipe refrigerating device. In addition, a vaporized gas from the tank (3) or (8) is introduced to the recondensing chamber (24) through the capillary (25) or the outer tube of the duplex tube (29) and, after recondensation, returned to the tank (3) or (8) through the inner tube of the tube (29). Moreover, the low-temperature generating section (20), cold head (21), recondensing chamber (24), and capillary (25) or duplex tube (29) are integrated into a recondensing section (A) and the section (A) is detachably attached to the container (1) through an attaching member (26).
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