World’s Achievements in the Development of Superconducting Materials at Liquid Helium Temperature
Ductile Nb-Ti superconducting alloy is practically used for generating relatively low magnetic fields. On the other hand, brittle Nb3Sn and V3Ga superconducting compounds are practically used in high fields. Remarkable improvements have been achieved on the critical current densities, Jo, and the a.c. properties of the Nb-Ti multifilamentary wire. Nb-tube processed (Nb,Ti)3Sn multifilamentary conductor shows the best high-field Jo among the multifilamentary superconductors, although a similar high Jo is obtained for improved surface-diffusion V3Ga tape at 17–20 T and 4.2 K. A Nb3Al ultra-fine multifilamentary conductor developed recently is worth noticing as a promising candidate of the new practical superconductors.
KeywordsCritical Current Density High Critical Current Density Twist Pitch Critical Current Measurement Metallic Superconductor
Unable to display preview. Download preview PDF.
- 1.Matsumoto, K. and Tanaka, Y., High critical current density in multi- filamentary Nb-Ti superconducting wires, to be published in Proc. 6th US-Japan Workshop on High Field Super conductors (1989, Boulder, Colorado);Google Scholar
- 3.Kanithi, H., Expectations and limitations of Jo in practical Nb-Ti conductors. Adv. Cryo. Engn. Mater., 1988, 34, 951–958.Google Scholar
- 4.Shiraki, H., Nakayama, S., Tanaka, M., Murase, S., Aoki, N., Ichihara, M., Watanabe, K., Noto, K., and Muto, Y., High-field superconducting properties of Ti doped NbsSn conductor by the Nb tube method, to be published in Proc. MRS Int. Meet. Adv. Mater., (1988, Tokyo).Google Scholar
- 5.Tachikawa, K., Takeuchi, K., Iijima, Y., Inoue, K. and Togano, K., High field superconducting properties of V3Ga tapes. Adv. Cryo. Engn. Mater., 1988, 34, 585–592.Google Scholar
- 7.Takeuchi, T., Iijima, Y., Kosuge, M., Kuroda, T., Yuyama, M. and Inoue, K. Effects of additive elements on continuous ultra-fine Nb3Al MF conductors. IEEE Trans. Magn., 1989, 25.Google Scholar
- 9.Kubo, Y., Yoshizaki, K., Fujiwara, F., Noto, K. and Watanabe, K. Small coil tests of Chevrel-phase PbMo6S8 wires. to be published in Proc. MRS Int. Meet. Adv. Mater., (1988, Tokyo).Google Scholar
- 10.Hlasnik, I. Progress and problems in superconducting composites for ac applications. Proc. Int. Symp. Flux Pinning & Electromagnetic Properties in Superconductors., (Fukuoka, 1985) Matsukuma Press Co, p.247–253.Google Scholar
- 11.Shimizu, E. and Ito, D. Development of 50 kVA superconducting coil with Nb-Ti ultra-fine multifilamentary superconductor. Cryogenic Engineering (in Japanese), 1988, 23 192–204.Google Scholar
- 13.Smathers, D., O′Larey, P., Siddall, M., and McDonald, W. Status of the superconductor development program at Teledyne Wah Chang Albany. Adv. Cryo. Engn. Mater., 1988, 34, 515–522.Google Scholar
- 14.Hazelton, D.W., and Ozeryansky, G.M. Development of internal tin Nb3Sn conductor for high field magnet use. Adv. Cryo. Engn. Mater., 1988, 34, 499–506.Google Scholar
- 16.Kumakura, H., Togano, K., Iijima, Y. and Tachikawa, K. Critical current measurement and coil tests for Nb3Al superconducting tapes fabricated by continuous laser and electron beam irradiation. Adv. Cryo. Engn. Mater., 1988, 34, 469–475.Google Scholar