TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)
Online ISSN : 1880-0408
Print ISSN : 0389-2441
ISSN-L : 0389-2441
Originals
Mass Production and Quality Control of Nb3Sn Superconducting Strands for ITER Toroidal Field Coils
Yoshihiro NABARAYoshihiko NUNOYATakaaki ISONOKazuya HAMADAYasuhiro UNOYoshikazu TAKAHASHIHideo NAKAJIMASeiji TSUZUKUKouhei TAGAWAKatsumi MIYASHITAYukinobu MURAKAMITakayuki MIYATAKEMasatoshi YOSHIKAWA
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JOURNAL FREE ACCESS

2012 Volume 47 Issue 3 Pages 140-146

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Abstract
Superconducting conductors are applied in the toroidal field (TF) coils, poloidal field coils, and central solenoid (CS) in the ITER. The Japan Atomic Energy Agency plans to procure 25% of the TF conductors and 100% of the CS conductors. Mass-produced Nb 3Sn superconducting strands for TF conductors have been supplied by two manufacturers since 2008. The total length of the strands is approximately 23,000 km; thus, quality control is extremely important. A statistical process control has been adopted in order to reduce the dispersion of strand performance, and stable performance of the mass-produced strands was achieved. Both manufacturers improved the fabrication yield through mass production. Approximately 72% of the Japanese share in TF strands has been produced as of October 2011.
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© 2012 by Cryogenics and Superconductivity Society of Japan (Cryogenic Association of Japan)
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