Study on the Residual Strain and the Superconducting Properties for Practical Nb3Sn Superconducting Wires


The large enhancement of the superconducting properties can be achieved by repeated bending process at room temperature i.e., the prebending effect. We investigated the prebending effects on the superconducting properties for practical Nb3Sn wires. We found that the most effective enhancement of the critical current was obtained for the Nb3Sn wire with reinforcement materials in the outer part as shown in the left figure. The right figure shows the residual strain measurement of the Nb3Sn wires by the neutron diffraction. The reductions of the residual strains of the axial and the lateral directions play an important role for the prebending effects.

IMR, Tohoku University: H. Oguro, G. Nishijima, S. Awaji, P. Badica, K. Watanabe
Furukawa Electric Co., Ltd.: K. Miyoshi, S. Meguro
Fac. of Eng., Iwate University: K. Katagiri
High Energy Accelerator Research Organization: F. Shikanai, T. Kamiyama

Reference: H. Oguro, G. Nishijima, S. Awaji, K. Miyoshi, S. Meguro, and K. Watanabe, "Effect of prebending strain on CuNb/Nb3Sn superconducting coils using a react and wind method", IEEE Trans. Appl. Supercond. 16 (2006) 1237- 1240.


東北大学金属材料研究所:小黒英俊,西島 元,淡路 智,P. Badica,渡辺和雄
高エネルギー加速器研究機構:鹿内文仁,神山 崇