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Demonstration research for improvement of the critical current of cable in conduit conductor with additional torsional strain

Research Project

Project/Area Number 15K06654
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Nuclear fusion studies
Research InstitutionNational Institute for Fusion Science

Principal Investigator

IMAGAWA Shinsaku  核融合科学研究所, ヘリカル研究部, 教授 (10232604)

Project Period (FY) 2015-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2015: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywordsケーブル・イン・コンジット / 超伝導 / ねじり / ひずみ / 臨界電流 / ケーブル・イン・コンジット
Outline of Final Research Achievements

In order to prove improvement of critical current by being twisted, I proposed a spring-shaped test coil and settled on the test method in liquid helium. I tried to make a small-scale Nb3Sn cable-in-conduit conductor, and made clear technical subjects for making the testing sample, such as reduction of the conductor diameter and shaping the conductor into a spring shape. In parallel, a concept of helical winding with a wind, react, and transfer method was studied. I proposed a new method to install a winding core with function as an oven in the position rotated by 12 degree in the toroidal direction from the helical coil, and showed that the maximum strain during transfer the conductor from the winding core to the final position can be restrained in less than 0.15 % by an analysis using a finite element method.

Academic Significance and Societal Importance of the Research Achievements

コンジットの捩り加工による超伝導特性の改善効果の実証までは至らなかったが,一連の研究において,ケーブル・イン・コンジット導体に捩り変形を加える際に超伝導撚線に生じるひずみはコンジットに生じるひずみの数分の1以下と小さいこと明らかにした。この成果は,ひずみに対して脆いNb3Sn線材を用いる超伝導マグネットの製作上の取り扱いを容易とする重要な知見である。また,ワインド・リアクト・トランスファー法がヘリカルコイルにも適用可能であることを示したことは,ヘリカル型核融合炉のヘリカルコイルが現在製作中のITERの超伝導マグネットと同等の技術で製作可能であることを示す重要な成果である。

Report

(5 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (7 results)

All 2018 2017 2016 2015

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results,  Acknowledgement Compliant: 1 results) Presentation (5 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Study on Wind-React-Transfer Method for Helical Coils Wound from Nb<sub>3</sub>Sn Cable-in-Conduit Conductors2018

    • Author(s)
      S. Imagawa
    • Journal Title

      Plasma and Fusion Research

      Volume: 13 Issue: 0 Pages: 3405027-3405027

    • DOI

      10.1585/pfr.13.3405027

    • NAID

      130006744382

    • ISSN
      1880-6821
    • Year and Date
      2018-04-10
    • Related Report
      2018 Annual Research Report 2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Feasibility Study of React-and-Wind Method for Helical Coils Wound from Cable-in-Conduit Conductors2016

    • Author(s)
      S. Imagawa
    • Journal Title

      Plasma and Fusion Research

      Volume: 11 Issue: 0 Pages: 2405058-2405058

    • DOI

      10.1585/pfr.11.2405058

    • NAID

      130005243444

    • ISSN
      1880-6821
    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Presentation] Nb3Sn導体のワインド・リアクト・トランスファー法によるヘリカルコイル巻線の概念検討2018

    • Author(s)
      今川信作
    • Organizer
      2018年核融合エネルギー連合講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Study on wind-react-transfer method for helical coils wound from Nb3Sn cable-in-conduit conductors2017

    • Author(s)
      S. Imagawa
    • Organizer
      ITC-26/APFA-11
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Nb3Sn導体のリアクト・アンド・ワインド法によるヘリカルコイル巻線の概念検討2016

    • Author(s)
      今川信作
    • Organizer
      2016年核融合エネルギー連合講演会
    • Place of Presentation
      九州大学
    • Year and Date
      2016-06-14
    • Related Report
      2016 Research-status Report
  • [Presentation] Feasibility Study of React-and-wind Method for Helical Coils Wound from Cable-in-conduit Conductors2015

    • Author(s)
      S. Imagawa
    • Organizer
      25th International TOKI Conference
    • Place of Presentation
      Toki, GIFU, Japan
    • Year and Date
      2015-11-03
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research
  • [Presentation] リアクト・アンド・ワインド法によるヘリカルコイル巻線の概念検討2015

    • Author(s)
      今川信作
    • Organizer
      2015年度秋季低温工学・超電導学会講演会
    • Place of Presentation
      姫路市
    • Year and Date
      2015-11-02
    • Related Report
      2015 Research-status Report

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Published: 2015-04-16   Modified: 2020-03-30  

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