Large Tc, BC2 and Ic enhancement effect due to the prebending treatment for bronze route Nb3Sn wires

K. Watanabe, S. Awaji, H. Oguro, G. Nishijima, K. Miyoshi, S. Meguro

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


In order to develop a react-and-wind (R&W) processed Nb3Sn superconducting magnet, we investigated the influence on the superconducting properties due to the prebending treatment. Since a reacted Nb3Sn superconducting wire reveals a very sensitive response from stress and strain, we focus on the prebending treatment which is repeatedly applied to the Nb 3Sn wire through several pulleys in the R&W coil winding process. We found that the prebending treatment doubles the Ic value at 20 T and 4.2 K for bronze route Nb3Sn wires. This Ic enhancement effect comes from the Tc and Bc2 enhancement. It turned out that Tc increases from 17.4 to 17.9 K and as a result Bc2 also increases from 23.7 to 25.2 T at 4.5 K for bronze route multifllamentary Nb3Sn wires prebent at bending strain of 1.0% and at 5 repeated times.

Original languageEnglish
Pages (from-to)3564-3567
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number2 PART III
Publication statusPublished - 2005 Jun


  • Bending strain
  • Critical current density
  • CuNb reinforcement
  • Nb Sn
  • React and wind process

ASJC Scopus subject areas

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


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