CURRENT LEAD OF SUPERCONDUCTING MAGNET APPARATUS

PURPOSE:To support an increase in current by a method wherein a rod-like steel material having high rigidity even at a low temperature and low temperature conductivity is used as a core material, an oxide superconductive body is wound in a spiral around the surface of the core, and this is inserted into a hollowed tube wherein low temperature helium gas is made flow into a space generated to make a superconductive state. CONSTITUTION:A conductor 31 is composed of a cylindrical rod or a hollowed rod made of stainless steel, manganese steel or nichrome steel having high rigidity even at a low temperature and low temperature conductivity, and this is used as a core material 32. An oxide superconductor 33 is spirally wound around the outer surface of the core with an interval 32 to form the conductor 31, and this structure is inserted into a hollowed tube 36 which has been similarly fabricated of stainless steel or the like while its outer periphery is enclosed by an insulating tube 37 if necessary. Thus a cooling path 38 is made between the core material 32 and the hollowed tube 36, and vaporized low temperature helium gas 1G is made flow into the path 38 from the upper end of a current lead 30 to cool the conductor 31. Thus it is possible to supply large current to the lead 30.