CURRENT LEAD OF SUPERCONDUCTING ELECTROMAGNET DEVICE

摘要

PURPOSE:To stabilize a current lead mechanically, thermally and magnetically and to lessen the vaporization loss of liquid helium by a method wherein superconducting conductors are formed of an oxide superconductor covered with a metal of a good conductivity as their main conductor, are jointed to the interiors of recessed grooves in a heat stabilizing material consisting of a material of a good conductivity, are supported by the grooves and the current lead is held by a reinforcing material of a low heat conductivity. CONSTITUTION:Superconducting conductors 11 respectively consist of an oxide superconductor 11A covered with a metal cover 11B of a good conductive metal, are housed in recessed grooves 12A formed in a heat stabilizing material 12 and are jointed to the interiors of the grooves. A path 14 for helium gas IG is held by the recessed grooves formed in the material 12 between a reinforcing material 13 and the material 12 and a unit conductor part 10 is constituted. The conductor part 10 is housed in an outer cylinder 15 consisting of a low-heat conductivity and low-conductivity metal material and a current lead 20 is formed. The lead 20 constituted in such a way is installed on an electromagnet device and in the case and excitation current is fed to a superconducting coil, the current lead is cooled with the low-temperature helium gas IG to pass through the path 14 and a superconducting state is held in the conductors 11A.