| 摘要 |
PURPOSE:To obtain a current lead which is small in penetration heat and Joule heat, adequate in heat capacity, stable, and induces a magnetic field little when a current flows through it by a method wherein a helium gas cooling path is provided between a first conductor wound on the surface of a hollow core material and a second conductor wound on the inner face of an outer cylinder which surrounds the core material, and the conductors are insulated from each other. CONSTITUTION:A first conductor 31 wound in spiral on the outer circumferential face of a core material 33 and a second conductor 32 wound in spiral coming into close contact with the inner circumferential face of an outer cylinder 34 are housed in a gap formed between the cylindrical core material 33 provided with a vacuous cavity 33A and the outer cylinder 34 coaxially surrounding the core material 33, and a helium gas cooling path 35 in which helium gas 1G of low temperature is made to flow in the direction indicated by the arrows is provided between the conductors 31 and 32. The conductors 31 and 32 are electrically connected to the ends of a superconductive coil through the intermediary of connection leads respectively at the lower end of a current lead 30, and thus a current lead, where round conductors through which exciting currents flow in mutually reverse directions are formed in one piece, can be obtained. |
