| 摘要 |
PURPOSE:To efficiently cool a superconducting coil by injecting refrigerant helium gas when the temperature of the superconducting coil is high, externally precooling the coil, and feeding the gas into the the coil to cool it when the temperature of the coil drops. CONSTITUTION:When the temperature of a superconducting coil 21 is high, a helium injection valve 29 is opened to inject refrigerant helium gas from a refrigerator from the valve 29, and the coil 21 is externally precooled. The injected gas is sucked from a suction valve 31, and returned to the refrigerator. When the temperature of the coil 21 is reduced by precooling, the valves 29, 31 are closed, and the gas is fed in the coil 21. In this case, since the coil 21 is precooled, the gas is smoothly fed into the coil 21. Remaining gas in a vacuum tank 12 is discharged by a vacuum pump 14. Thus, the desired coil can be efficiently cooled. |
