Nb-rod-method Cu–Nb/Nb3Sn wires for practical react-and-wind applications

Masahiro Sugimoto, Kota Katayama, Akira Takagi, Hitoshi Shimizu, Hirokazu Tsubouchi, Satoshi Awaji, Hidetoshi Oguro

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Bronze-processed Nb3Sn-based wires reinforced by Nb-rod-method Cu–Nb composite (Cu-Nb/Nb3 Sn) are applicable to react-and-wind (R&W)-processed Nb3 Sn coils. The Cu–Nb composite material functions as a reinforcing stabilizer during the superconducting magnet operation. Moreover, it suppresses the damage of reacted Nb3 Sn filaments due to applied stress during the manufacturing process such as the prebending treatment, the insulating, and the winding. New Cu–Nb/Nb3 Sn wires with high tin bronze (Cu-15.7wt%Sn-0.3wt%Ti) were investigated in the superconducting properties. The round wire of 0.8-mm diameter with prebending strain εp b = ±0.5% demonstrated a non-Cu-Jc of 1150 A/mm2 at 12 T and 4.14 K. The rectangular wire of 1.13 × 1.7 mm with εp b = ±0.5% applied from both directions of flatwise and edgewise had a non-Cu-Jc of 355 A/mm2 at 17 T. In this paper, we discuss the cross-sectional designs of Cu–Nb/Nb3 Sn wires suitable for practical R&W Nb3 Sn applications.

Original languageEnglish
Article number6000105
JournalIEEE Transactions on Applied Superconductivity
Issue number3
Publication statusPublished - 2018 Apr


  • Bronze-processed Nb3Sn wire
  • Nb-rod-method Cu-Nb
  • Pre-bending effect
  • Pure-bending strain
  • React-and-wind

ASJC Scopus subject areas

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


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