OXIDE SUPERCONDUCTING CURRENT LEAD AND COOLING WINDING STRUCTURE

PROBLEM TO BE SOLVED: To prevent the occurrence of bending stresses in oxide superconducting current leads and the deformation of the leads by providing spiral recessed sections on a nonmagnetic winding base material around which an oxide superconducting material is wound by forming spiral projecting sections and respectively fixing top- and bottom-side silver electrodes to both ends of the winding base material. SOLUTION: A nonmagnetic winding base material 22 carrying a plurality of spiral recessed sections 21 having bottom grooves 20 formed of spiral projecting sections 19 is obtained by forming the projecting sections 19 having narrow grooves 18 on the outer periphery of a cylindrical core. An oxide superconducting material 23 is wound around the base material 22 by laying the material 23 in the recessed sections 21 of the material 22. One end of the material 23 is stuck and fixed to a top-side silver electrode 24 having a large step section 30a, a plurality of small step sections 31n, and a hollow hole 33a in its central part in the radial direction and the other end of the material 23 is stuck and fixed to a bottom-side silver electrode 25 having a large step section 30b, a middle step section 34, and inclined holes 37 formed through the step section 34.