[Table of Contents]

Plasma and Fusion Research

Volume 9, 3405034 (2014)

Regular Articles

Development of an Indirectly Cooled Superconductor for the LHD Fusion Reactor FFHR
Kazuya TAKAHATA, Hitoshi TAMURA, Toshiyuki MITO, Shinsaku IMAGAWA and Akio SAGARA
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
(Received 21 November 2013 / Accepted 5 March 2014 / Published 7 May 2014)

Abstract

A 100-kA indirectly cooled superconductor has been designed and optimized for the heliotron fusion power reactor FFHR. A doubly transposed Rutherford cable composed of 216 Nb3Sn superconducting wires is embedded in an aluminum-alloy jacket with a high filling factor. Additional high purity aluminum strips around the cable reduce the hotspot temperature to 150 K. The final design has a rectangular cross section that is 100 mm wide and 25 mm high, which will achieve an operating current of 100 kA at a current density of 40 A/mm2. A prototype of the conductor was developed to demonstrate the fabrication process. The prototype has the same configuration as the design, except that the aluminum strips are eliminated.

Keywords

heliotron fusion reactor, indirectly cooled superconductor, Nb3Sn superconductor, Rutherford cable, aluminum-alloy jacket, friction stir welding

DOI: 10.1585/pfr.9.3405034

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This paper may be cited as follows:

Kazuya TAKAHATA, Hitoshi TAMURA, Toshiyuki MITO, Shinsaku IMAGAWA and Akio SAGARA, Plasma Fusion Res. 9, 3405034 (2014).