SUPERCONDUCTING PROPERTIES OF METER-CLASS MULTIFILAMENTARY NB3SN FIBER-REINFORCED SUPERCONDUCTORS

A new type of Nb3Sn superconductor, fiber-reinforced superconductor (F RS), has been developed for application in high-field pulsed supercond ucting magnets. This paper describes the superconducting properties of multifilamentary FRS with a length of one meter made by a sputtering apparatus with spools. The strain versus stress relationship and strai n versus critical current properties are compared with those of other samples including monofilamentary FRS. The index (n) values are examin ed for the multifilamentary FRS and compared with those of monofilamen tary ERS selected from the multifilamentary FRS. A low-J(c) FRS and a high-J(c) FRS prepared by the same process are examined in terms of th e critical current distribution.