PURPOSE: To manufacture a highly stable superconductive conductor by skip- winding the outer peripheries of tertiary and quadratic stranded wires with an electric insulation thin wall tape to constitute a stranded wire in a cable-in- conduit type forced cooling conductor.
CONSTITUTION: Three primary stranded wires, wherein three superconductive raw materials 11 are twisted, are twisted to form a secondary stranded wire 12, and moreover three secondary stranded wires 12 are twisted to form a tertiary stranded wire 13. An electrical insulation thin wall tape or foil 14 is spirally skip-wound along a longitudinal direction on the outer periphery of the tertiary stranded wire 13, and moreover three tertiary stranded wires 13 are twisted to form a quadratic stranded wire 15. wed Similarly, the thin wall tape 14 is skip-wound on the quadratic stranded wire 15, and some of the quadratic stranded wires 15 are bundled to be adopted as stranded wires to constitute the final stranded wire. Then 6 final stranded wires are twisted to be housed in a conduit 16 to be die-drawn to a given void ratio, manufacturing a superconductive conductor 18. This can provide the superconductive conductor 18 to a low void ratio so that the superconductive raw wire 11 in the conduit 16 can not be moved by electromagnetic force.
ONO MICHITAKA
SHIMADA MAMORU
HAMASHIMA KOTARO
