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STUDY ON THE EFFECT OF THE CURRENT DISTRIBUTION ON STABILITY OF A SUPERCONDUCTING MULTI-STRANDED CABLE.

Research Project

Project/Area Number 06452207
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 電力工学・電気機器工学
Research InstitutionNATIONAL INSTITUTE FOR FUSION SCIENCE

Principal Investigator

MITO Toshiyuki  National Institute for Fusion Science, Department of the LHD Project Associate Professor, 大型ヘリカル研究部, 助教授 (10166069)

Co-Investigator(Kenkyū-buntansha) IWAMOTO Akifumi  National Institute for Fusion Science, Department of the LHD Project Research As, 大型ヘリカル研究部, 助手 (00260050)
YAMADA Shuichi  National Institute for Fusion Science, Department of the LHD Project Research As, 大型ヘリカル研究部, 助手 (50249968)
YANAGI Nagato  National Institute for Fusion Science, Department of the LHD Project Research As, 大型ヘリカル研究部, 助手 (70230258)
TAKAHATA Kazuya  National Institute for Fusion Science, Department of the LHD Project Research As, 大型ヘリカル研究部, 助手 (10216773)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥6,700,000 (Direct Cost: ¥6,700,000)
Fiscal Year 1995: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1994: ¥5,200,000 (Direct Cost: ¥5,200,000)
KeywordsSuperconductor / Stranded cable / Current sharing / Stability / ケーブルインコンジット / 成型撚線
Research Abstract

The stability of a multi-stranded superconducting cable is strongly influenced by the initial current distribution among strands and the transient current sharing after a quench of a part of stands. At first, we researched the previous studies about the stability of a multi-stranded superconducting cable. It became clear that the small deviation of the inductance of each strands for a cable in conduit conductors (CICC) may cause the large unbalance of the current distribution among strands. However, there are not enough studies which can explain the relation between the current distribution of a multi-stranded cable and its stability. We studied experimentally the characteristics of the current transfer and stability of a two-strands cable. The current transfer from the quench strand to the other strand is faster than the heat transfer between strands, when the surfaces of strands are naturally oxidized without an insulation coating. The stability of a two-strands cable becomes higher … More than that of a monolith cable because of the effect of the transient heat transfer to a liquid helium. Then a triplet superconducting cable without any coating on its surface has been used to study the influences of the current distribution within the triplet on its stability. The Minimum Quench Energies (MQE) have been measured with different initial current distributions within the triplet. It became clear that the initial current distribution, which can maximize the MQE,changes with the external magnetic fields, the total transport current and the time duration of heat inputs. The same complicated relations between the current sharing properties within the cables were obtained in the experiments of the compacted strand cable with different matrix structures and different crossover resistance. The minimum quench energies of the cable with low crossover resistance were not always larger than those of the cale with high crossover resistance. Above experimental results showed that the stability of the superconducting cable is affected with not only the current distribution properties but also other parameters such as the stability margin of a single strand, the heat transfer properties between strands and the cooling conditions. It is necessary to design the superconducing cable according to the condition of the real use of the superconducting coils. Less

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] A. Kimura: "Stabilities of the Rutherford Cables with Cu Matrix and CuMn Barrier" IEEE Transactions on Applied Superconductivity. vol.5 No.2. 385-388 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S. W. Kim: "Experimental Studies on Stabilities of Rutherford Cables for Superconducting Accelerator Magnets" IEEE Transactions on Magnetics Conference issue for 14th International conf. on Magnet Technology. (発表予定). (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S. W. Kim: "Studies on Stabilities of Superconducting Rutherford Cables" Proceeding of the CEC/ICMC Columbus, ohio, U. S. A. , July, 1995. (発表予定). (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] A.Kimura: "Stabilities of the Rutherford Cables with Cu Matrix and CuMn Barrier" IEEE Transactions on Applied Superconductivity. Vol.5, No.2. (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S.W.Kim: "Experimental Studies on Stabilities of Rutherford Cables for Superconducting Accelerator Magnets" IEEE Transactions on Magnetics, Conference issues for 14-th International Magnet Technology. (to be published in). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S.W.Kim: "Studies on stabilities of Superconducting Rutherford Cables" Proceedings of the CEC/ICMC,Columbus, Ohio, U.S.A., July, 1995. (to be published in). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S.W.KIM: "Experimental Studies on Stabilities of Rutherford Cables for Superconducting Accelerator Magnets" IEEE Tranasactions on Magnetics Proceedings for MT-14. (発表予定). (1996)

    • Related Report
      1995 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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