IAEA Fusion Energy Conference 2010

Proceedings of the 23rd IAEA Fusion Energy Conference
Daejeon, 11-16 October 2010

Organized by the International Atomic Energy Agency
and hosted by the Government of the Republic of Korea


(ITR/P1-50) Technology Development for the Manufacture of Nb3Sn Conductors for ITER Toroidal Field coils

Y. Takahashi1), T. Isono1), K. Hamada1), Y. Nunoya1), Y. Nabara1), K. Matsui1), T. Hemmi1), K. Kawano1), N. Koizumi1), M. Oshikiri1), Y. Uno1), S. Ito1), M. Yoshikawa1), H. Nakajima1), K. Okuno1), A. Devred2), N. Mitchell2)
1) Japan Atomic Energy Agency, 801-1-Mukouyama, Naka 311-0193, Japan
2) ITER Organization, Cadarache Centre, 13067 St Paul lez Durance Cedex, France

Abstract.  Japan Atomic Energy Agency is procuring the Nb3Sn superconductors for Toroidal Field (TF) Coils under the ITER project. Because manufacturing amount of Nb3Sn strands is quite large compared with the past experience and required superconducting performance is higher than that of the model coils which have been fabricated and tested in the ITER-EDA, quality control technique is very important for the manufacture of the strands. About 40 tons of Nb3Sn strands were completed successfully under the severe quality control and these strands meet the ITER specification. Sophisticated control technique is also required for the jacketing, in order to fabricate the conductors with the precise outer diameter and without leakage at welding part. For example, the inspection technique by using laser for the inner surface of welding part was developed.

A full-length (760 m) Cu dummy conductor has been fabricated successfully and all jacketing technology was confirmed through this fabrication. The manufacturing procedure specifications, which satisfy the ITER requirements, were established. The fabrication of the Nb3Sn conductor for TF coils will start in March 2010.

Full paper available (PDF)