Development of high J c Nb-Ti multifilamentary superconducting wires for a.c. use by artificially introduced pins

O. Miura, I. lnoue, T. Suzuki, K. Matsumoto, Y. Tanaka, K. Funaki, Masataka Iwakuma, K. Yamafuji, T. Matsushita

Research output: Contribution to journalArticle

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Abstract

To achieve further increases in the critical current densities of Nb-Ti ultrafine multi-filamentary superconducting wires for a.c. applications, wires were fabricated in which Nb island-type artificial pinning centres had been designed and introduced into filaments according to flux pinning theory. The changes in pin parameters which accompanied the diameter reduction increased the pinning force density F p over a wide range of magnetic field, and oversaturation phenomena were observed, with the position of the F p peak shifting towards the high-field side. High critical current densities J c were achieved: 1.42 × 10 10 A m -2 at 1 T for 0.1 μm filaments, and 8.7 × 10 9 A m -2 at 2 T and 6.1 × 10 9 A m -2 at 3 T for 0.4 μm filaments. Furthermore, it was determined that where the correlation length I 66 and fluxoid interval a f are such that 2I 66 < a f , the magnetic field at the F p peak is determined by the pin interval d s . This discovery has given us useful pointers for the design of Nb-Ti superconducting a.c. wires, in terms of J c , through the introduction of artificial pins.

Original languageEnglish
Pages (from-to)169-180
Number of pages12
JournalCryogenics
Volume35
Issue number3
DOIs
Publication statusPublished - Jan 1 1995

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Superconducting wire
filaments
wire
Magnetic fields
Flux pinning
critical current
current density
intervals
dials
flux pinning
Wire
magnetic fields
Ultrafine

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physics and Astronomy(all)

Cite this

Miura, O., lnoue, I., Suzuki, T., Matsumoto, K., Tanaka, Y., Funaki, K., ... Matsushita, T. (1995). Development of high J c Nb-Ti multifilamentary superconducting wires for a.c. use by artificially introduced pins Cryogenics, 35(3), 169-180. https://doi.org/10.1016/0011-2275(95)93990-H

Development of high J c Nb-Ti multifilamentary superconducting wires for a.c. use by artificially introduced pins . / Miura, O.; lnoue, I.; Suzuki, T.; Matsumoto, K.; Tanaka, Y.; Funaki, K.; Iwakuma, Masataka; Yamafuji, K.; Matsushita, T.

In: Cryogenics, Vol. 35, No. 3, 01.01.1995, p. 169-180.

Research output: Contribution to journalArticle

Miura, O, lnoue, I, Suzuki, T, Matsumoto, K, Tanaka, Y, Funaki, K, Iwakuma, M, Yamafuji, K & Matsushita, T 1995, ' Development of high J c Nb-Ti multifilamentary superconducting wires for a.c. use by artificially introduced pins ', Cryogenics, vol. 35, no. 3, pp. 169-180. https://doi.org/10.1016/0011-2275(95)93990-H
Miura, O. ; lnoue, I. ; Suzuki, T. ; Matsumoto, K. ; Tanaka, Y. ; Funaki, K. ; Iwakuma, Masataka ; Yamafuji, K. ; Matsushita, T. / Development of high J c Nb-Ti multifilamentary superconducting wires for a.c. use by artificially introduced pins In: Cryogenics. 1995 ; Vol. 35, No. 3. pp. 169-180.
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