Influence of rapid heating condition on superconducting properties in transformed jelly-roll Nb3Al multifilamentary wire

N. Harada, T. Nakano, M. Tsuda, T. Hamajima, F. Buta, E. Lee, M. D. Sumption, E. W. Collings, K. Tagawa, H. Moriai, T. Takeuchi, H. Wada, K. Watanabe

Research output: Contribution to journalConference articlepeer-review

4 Citations (Scopus)


Understanding the variation of the superconducting properties as a function of the maximum heat treatment temperature or heating time in jelly-roll Nb3Al wire is important for the optimization of the rapid heating conditions. Jelly-roll Nb3Al wires with a Nb matrix were ohmically-heated to maximum temperatures ranging from 1900 to 2300°C in vacuum in order to optimize the rapid heating conditions and to investigate the superconducting properties for this transformation method. The diameter of the wire was 0.94 mm. The sample was monitored using a noncontact measurement technique employing a photodiode to measure high temperatures (over 2000°C) during rapid heating. After the surface temperature reached a maximum, the sample was quenched in liquid gallium. The samples were annealed for 10 hours at 800°C after the rapid heating process to transform the bcc-phase to the A15 phase. The superconducting properties including DC magnetization and critical current were explored for various maximum heating temperatures and heating times. The magnetic field dependence of the pinning force density was investigated for these various conditions.

Original languageEnglish
Pages (from-to)1033-1036
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number1
Publication statusPublished - 2002 Mar
Externally publishedYes
Event17th Annual Conference on Magnet Technology - Geneva, Switzerland
Duration: 2001 Sep 242001 Sep 28


  • NbAl
  • Ohmic heating
  • Pinning force density
  • Superconducting materials

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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