TITANIUM OR TANTALUM ADDITIONS TO NB3SN LAYERS FROM REINFORCEMENT FIBERS IN FIBER-REINFORCED-SUPERCONDUCTORS

Fiber-Reinforced-Superconductors (FRS) of Nb3Sn were prepared using ti tanium and tantalum fibers. Their superconducting characteristics were estimated by separating the effects of prestrain from them. The resul ts have shown that the tantalum fiber functions both as a reinforcemen t for FRS and as a source that supplies tantalum elements to improve t he high-field properties of Nb3Sn. The characteristics were. degraded inversely when a titanium fiber was used. In the case of preparing a F RS using a titanium-added niobium target, the characteristics improved . The discrepancy in global pinning force between monofilamentary FRS and multifilamentary FRS is also shown.