High-strength Nb3Sn wire development for compact superconducting magnets

K. Watanabe, S. Awaji, G. Nishijima

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


A superconducting magnet with a magnetic energy of E = B 2/2μo [J/m3] has to overcome a magnetic force of P = B2/2μo [Pa] in the same expression. This means that a high-field 20 T superconducting magnet produces an electromagnetic force of 160 MPa. In order to stand such a large force, Nb3Sn superconducting wires are usually reinforced by the hard-copper housing as an external reinforcement method or the stainless steel winding as a mechanical backup of an outermost Nb3Sn coil. If we focus on a compact superconducting magnet like a cryocooled superconducting magnet, a high-strength superconducting wire with a small diameter size of 1- 2 mm is required. The High-Field Laboratory for Superconducting Materials, IMR, Tohoku University has developed Nb3Sn wires internally reinforced with CuNb or CuNbTi composite. These high-strength Nb3Sn wires were successfully employed to construct the unique compact cryocooled 28 T hybrid magnet and the cryocooled 18 T high-temperature superconducting magnet. In addition, we found that the prebending effect for high-strength Nb3Sn wires outstandingly improves the Tc, BC2 and Ic properties. As a next step, we intend to develop new Nb3Sn strand cables with the strong mechanical property of 500 MPa, applying the prebending effect for a future 22 T-φ400 mm room temperature bore superconducting magnet of a 50 T-class hybrid magnet.

Original languageEnglish
Title of host publicationProgress in Light Metals, Aerospace Materials and Superconductors
PublisherTrans Tech Publications Ltd
Number of pages8
EditionPART 4
ISBN (Print)0878494324, 9780878494323
Publication statusPublished - 2007
Event2006 Beijing International Materials Week, 2006 BIMW - International Conference on Superconducting Materials, ICSM 2006 - Beijing, China
Duration: 2006 Jun 252006 Jun 30

Publication series

NameMaterials Science Forum
NumberPART 4
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752


Other2006 Beijing International Materials Week, 2006 BIMW - International Conference on Superconducting Materials, ICSM 2006


  • Electromagnetic force
  • High magnetic field
  • High strength
  • Mechanical properties
  • NbSn
  • Superconducting magnet

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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