Design and development of high-temperature superconducting magnet system with joint-winding for the helical fusion reactor

N. Yanagi, S. Ito, Y. Terazaki, Y. Seino, S. Hamaguchi, H. Tamura, J. Miyazawa, T. Mito, H. Hashizume, A. Sagara

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

An innovative winding method is developed by connecting high-temperature superconducting (HTS) conductors to enable efficient construction of a magnet system for the helical fusion reactor FFHR-d1. A large-current capacity HTS conductor, referred to as STARS, is being developed by the incorporation of several innovative ideas, such as the simple stacking of state-of-the-art yttrium barium copper oxide tapes embedded in a copper jacket, surrounded by electrical insulation inside a conductor, and an outer stainless-steel jacket cooled by helium gas. A prototype conductor sample was fabricated and reached a current of 100 kA at a bias magnetic field of 5.3 T with the temperature at 20 K. At 4.2 K, the maximum current reached was 120 kA, and a current of 100 kA was successfully sustained for 1 h. A low-resistance bridge-type mechanical lap joint was developed and a joint resistance of 2 nΩ was experimentally confirmed for the conductor sample.

Original languageEnglish
Article number053021
JournalNuclear Fusion
Volume55
Issue number5
DOIs
Publication statusPublished - 2015 May 1

Keywords

  • helical fusion reactor design
  • high-temperature superconductor
  • joint-winding

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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