| 摘要 |
PROBLEM TO BE SOLVED: To improve the electrical reliability of a soldered part by using the solder having a high melting point for soldering of an oxide superconducting current lead to an electrode, and using the solder having a low melting point for soldering of an electrode, which is to be soldered later, to a superconducting wire or an electrode terminal. SOLUTION: A low-temperature end of an oxide superconducting current lead 9a is soldered to an electrode 14 having a bottom plate 27, and the bottom plate 27 is screwed to a second plate cooling stage 6b through an insulting plate 16 and a bush 17. A superconducting coil terminal 28 is screwed to a superconducting coil frame 23 through an insulating member 22, and the superconducting wire 26 is wound around the periphery of the electrode 14, and a tip thereof is soldered thereto. After soldering the oxide superconductive current lead 9a to the electrode 14 with the solder alloy having a high melting point, soldering of the electrode 14 to the superconducting wire 26 is performed with the solder alloy having a melting point lower than that of the solder alloy having a high melting point. |
