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High-Strength Nb3Sn Wire Development for Compact Superconducting Magnets

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Abstract:

A superconducting magnet with a magnetic energy of E = B2/2μo [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.

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Periodical:

Materials Science Forum (Volumes 546-549)

Pages:

1841-1848

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.546-549.1841

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Online since:

May 2007

Authors:

K. Watanabe, Satoshi Awaji, Gen Nishijima

Keywords:

Electromagnetic Force, High Magnetic Field, High-Strength, Mechanical Property, Nb3Sn, Superconducting Magnet

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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References

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