Patent ID: 7602269
Filing Date: 2009-10-13
Classification: H01L

Abstract:
1. A permanent current switch comprising: a coiled superconducting wire and a winding portion which is wound with a heater wire which switches the superconducting wire between a superconducting state and a normal conducting state, the superconducting wire being a magnesium diboride superconducting wire having a high-resistance metal on an outer side and a magnesium diboride superconducting portion on an inner side and prepared by forming a superconducting metal on a layer between the high-resistance metal and the magnesium diboride superconducting portion; and a superconductive connecting section superconductively connected to a lead wire of the superconducting wire and a superconducting wire for a wiring line, wherein the superconductive connecting section superconductively connects the magnesium diboride superconducting portion or the superconducting metal with which the magnesium diboride superconducting portion is coated to a superconducting core portion of the superconducting wire for the wiring line via a low-melting superconducting metal or a low-melting superconducting alloy, wherein the lead wire comprises a portion having a Nb tube and a high resistance metal and a portion connected to the superconductive connecting section without the high-resistance metal.