| 摘要 |
PURPOSE:To reduce current attenuation rate, and to make it possible to generate a magnetic field which is stable for a long period of time by a method wherein the connection parts of a conducting wire are concentrated at the center part of a stabilizing material for connection by conducting plastic work on metal superconducting strands. CONSTITUTION:Twenty-four metal superconducting strands 33 are buried in stabilization copper on a cross section of Nb-Ti superconducting wires 31 and 32. The above- mentioned strands are dipped into nitric acid for the purpose of exposing the strands 33 on the terminal to be joined, the stabilized copper is removed, and after the strands have been exposed, they are rinsed. An Nb-Ti junction auxiliary member 34, which is same as the strands, is prepared in advance, and junction strands are enveloped. The stabilization copper on the auxiliary member 34 is removed using nitric acid in advance, and the strands are exposed. Then, oxygen free copper is inserted in the center part of the strands as a core material, a junction auxiliary strand 34 formed in advance covers the circumference of the strand group 33, which is inserted into the hollow part of the stabilized copper, placed in a mold and molded by applying pressure. |
