Plasma and Fusion Research

Volume 7, 2405027 (2012)

Regular Articles

Measurement of the Joint Resistance of Large-Current YBCO Conductors

Yoshiro TERAZAKI, Nagato YANAGI¹⁾, Sai TOMIDA²⁾, Hiroki NOGUCHI¹⁾, Kyohei NATSUME, Toshiyuki MITO¹⁾, Satoshi ITO³⁾, Hidetoshi HASHIZUME³⁾ and Akio SAGARA¹⁾

: Graduate University for Advanced Studies, 322-6 Oroshi-cho, Toki 509-5292, Japan
1): National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
2): Kagawa National College of Technology, 355 Chokushi-cho, Takamatsu 761-8058, Japan
3): Tohoku University, 6-6-01-2 Aoba-ku, Sendai 980-8579, Japan

(Received 9 December 2011 / Accepted 17 February 2012 / Published 10 May 2012)

Abstract

Feasibility studies on applying high-temperature superconductors (HTS) to the LHD-type heliotron fusion energy reactor FFHR are being carried out. Because the HTS conductor has high cryogenic stability at elevated temperature operations (e.g. 20 K) and the refrigeration power has enough margins, it is considered that Joule heating dissipation generated at joints of conductors is acceptable to facilitate the segmented fabrication of the helical coils of FFHR. In this study, the joint resistance with 10-kA class YBCO conductors has been measured to evaluate the joule heating dissipation in the FFHR magnet. The experiment has been carried out by fabricating a soldered lap joint and a mechanical lap joint. The feasibility of segmented fabrication is examined by the measured results.

Keywords

high-temperature superconductor, YBCO, joint resistance, soldered lap joint, mechanical lap joint

DOI: 10.1585/pfr.7.2405027

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This paper may be cited as follows:

Yoshiro TERAZAKI, Nagato YANAGI, Sai TOMIDA, Hiroki NOGUCHI, Kyohei NATSUME, Toshiyuki MITO, Satoshi ITO, Hidetoshi HASHIZUME and Akio SAGARA, Plasma Fusion Res. 7, 2405027 (2012).