Development of a High Current Density Distributed Tin Method Nb3Sn Wire

Shinya Kawashima, Takao Kawarada, Hiroyuki Kato, Yukinobu Murakami, Michinaka Sugano, Hidetoshi Oguro, Satoshi Awaji

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


We have developed a high-performance (high-JC) Nb3Sn wire via a distributed tin (DT) method. Non-Cu JC of 1100 A/mm2 at 16 T, 4.2 K has been achieved by improving the Sn diffusion and optimizing the Ti content. With the future circular collider magnet planned by European Organization for Nuclear Research (CERN), the target of non-Cu JC is set to 1500 A/mm2 at 4.2 K, 16 T. For this target, we have chosen the DT method, which is a type of internal Sn method, and because it has no limitation of Sn solubility, higher JC can be expected. This paper finds that further improvement of JC can be realized by controlling the Sn diffusion condition and the ternary additive elements. By setting the Sn diffusion distance to lower than 48 μm, the Nb3Sn composition in multi-Nb modules becomes uniform and fine. In addition, by controlling the ternary element content (Ti) for improving the characteristics of the middle magnetic field, it is possible to achieve high JC at 16 T.

Original languageEnglish
Article number8713386
JournalIEEE Transactions on Applied Superconductivity
Issue number1
Publication statusPublished - 2020 Jan


  • Bronze method
  • distributed tin method
  • NbSn
  • superconducting wire


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