Superconductivity and Cryogenics (한국초전도저온공학회지:초전도와저온공학)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Development plan for a persistent 1.3 GHz NMR magnet in a new MIRAI project on joint technology for HTS wires/cables in Japan

  • Yanagisawa, Y. (RIKEN) ;
  • Suetomi, Y. (Chiba University) ;
  • Piao, R. (RIKEN) ;
  • Yamagishi, K. (Sophia University) ;
  • Takao, T. (Sophia University) ;
  • Hamada, M. (Japan Superconductor Technology, Inc.) ;
  • Saito, K. (Japan Superconductor Technology, Inc.) ;
  • Ohki, K. (Sumitomo Electric Industries, Ltd.) ;
  • Yamaguchi, T. (Sumitomo Electric Industries, Ltd.) ;
  • Nagaishi, T. (Sumitomo Electric Industries, Ltd.) ;
  • Kitaguchi, H. (National Institute for Materials Science) ;
  • Ueda, H. (Okayama University) ;
  • Shimoyama, J. (Aoyama Gakuin University) ;
  • Ishii, Y. (Tokyo Institute of Technology) ;
  • Tomita, M. (Railway Technical Research Institute) ;
  • Maeda, H.
  • Published : 2018.07.31
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Abstract

The present article briefly overviews the plan for a new project on joint technology for HTS wires/cables and describes the development plan for the world's highest field NMR magnet, which is a major development item in the project. For full-fledged social implementation of superconducting devices, high temperature superconducting (HTS) wire is a key technology since they can be cooled by liquid nitrogen and they can generate a super-high magnetic field of >>24 T at liquid helium temperatures. However, one of the major drawbacks of the HTS wires is their availability only in short lengths of a single piece of wire. This necessitates a number of joints being installed in superconducting devices, resulting in a difficult manufacturing process and a large joint resistance. In Japan, a large-scale project has commenced, including two technical demonstration items: (i) Development of superconducting joints between HTS wires, which are used in the world's highest field 1.3 GHz (30.5 T) NMR magnet in persistent current mode; the joints performance is evaluated based on NMR spectra for proteins. (ii) Development of ultra-low resistive joints between DC superconducting feeder cables for railway systems. The project starts a new initiative of next generation super-high field NMR development as well as that of realization of better superconducting power cables.

Keywords

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