| 摘要 |
PURPOSE:To simplify the arrangement and reduce the space required for cooling a superconductive coil and the amount of required helium, by arranging a superconductive device such that a refrigerant advances upwardly in the gravitational direction in at least an area from a vaporizing section to a liquefying section, and providing a means for thermally connecting the vaporizing section and the superconductive coil. CONSTITUTION:Liquid helium P accommodated in a liquid helium tank 17 is gravitationally supplied to a refrigerant supply section 21 from the bottom of the tank 17. Since the section 21 is thermally insulated from a soaking plate 11, the liquid helium P is allowed to reach the lowermost end in the gravitational direction while maintaining the previous temperature. The liquid helium P which has reached a vaporizing section 22 is allowed to heat-exchange with a superconductive coil 1 through the soaking plate 11 and thereby vaporized since the vaporizing section 22 is thermally connected to the soaking plate 11. The vaporized refrigerant rises through the vaporizing section 22 while meandering to return to the space above the free liquid level in the liquid helium tank 17. The refrigerant gas in the space above the free liquid level is liquefied again by raising the pressure or by means of a liquefying device and supplied from the refrigerant supply section 21 again. |
