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1995 Fiscal Year Final Research Report Summary

Systematic Study of Micro-stability of Superconducting Magnets

Research Project

Project/Area Number 05452180
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 of Fusion Science (NIFS)

Principal Investigator

SATOW Takashi  NIFS,Large Helical Department, Asso.Prof., 装置技術研究系, 助教授 (80225961)

Co-Investigator(Kenkyū-buntansha) IWAMOTO Akifumi  NIFS,Large Helical Department, Assistant, 装置技術研究系, 助手 (00260050)
TAMURA Hitoshi  NIFS,Large Helical Department, Assistant, 装置技術研究系, 助手 (20236756)
TAKAHATA Kazuya  NIFS,Large Helical Department, Assistant, 装置技術研究系, 助手 (10216773)
MITO Toshiyukii  NIFS,Large Helical Department, Asso.Prof, 装置技術研究系, 助教授 (10166069)
Project Period (FY) 1993 – 1995
KeywordsMicro-stability / Superconducting magnets / Tightly-wound magnets / CICC (Cable-in conduit conductor) / Superconducting strands / Current-transfer phenomena / Poloidal coils / Scaling law
Research Abstract

9.1 Micro-stability of Tightly-wound Superconducting Magnets
In order to recognize of the adaptable regime of the stability theory (Paper No.1), two non-impregnated coils with a winding inside diameter of 90 mm were made as parameters of copper-superconductor ratios. Their quench and heated tests were carried out, and their winding current densities and limited disturbances were measured.
The coefficient of thermal expansion of a GFRP former was measured. Stability of the magnets will be analyzed by the use of this datum and strains measured by the coil tests.
9.2 Micro-stability of CICC Magnets
The practical design criterion for CICC magnets (Paper No.4) was applied to three pairs of poloidal coils for the Large Helical Device (LHD) of NIFS.The lower Inner Vertical (IV-L) Coil (Papers No.5 and No.6) was successfully tested up to the rated current of 20.8 kA without a quench. It is considered that the design criterion is reasonable and no-insulation on the conductor surface is good for stability.
Short samples of CICC for LHD and two-stranded samples were tested to research current-distribution instability of CICC,and limited disturbance densities were measured.
9.3 Micro-stability of Cryogenic Magnets
Analysis of limited disturbance densities were carried out for cryogenic magnets. The equivalent current of disturbance was proposed for a stability criterion.
9.4 Scaling Law for Superconducting Magnets
The stored energy dependence of winding current densities of many superconducting magnets were investigated and the scaling laws were obtained empirically and theoretically.

  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] T.Satow: "Optimum Conditions of Stabilizer Ratio and Critical Current Margin for Maximizing the Current Density of a Tightly-wound Superconducting Magnet" IEEE Tran.Applied Superconductivity. Vol.3,No.1. 539-542 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Takahata: "Stability of Cable-in-conduit Superconductors for Large Helical Device" IEEE Tran.Applied Superconductivity. Vol.3,No.1. 511-514 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Takahata: "Stability Tests of the Nb-Ti Cable-in-Conduit Superconductor with Bare Strands for Demonstration of the Large Helical Device Poloidal Field Coils" IEEE Tran.MAGNETICS. Vol.30,No.4. 1705-1709 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Satow: "Practical Design Criterion of a Superconducting Magnet wound from Cable-in-conduit Conductors with a Copper Matrix" 1994 Applied Superconductivity Conference,LQC-1,Boston. (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Satow: "Cooling and Excitation Tests of an Inner Vertical Coil for the Large Helical Device" IEEE Tran.MAGNETICS. Vol.32,No.4. 2244-2247 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Takahata: "Cooldown Performance of an Inner Vertical Field Coil for the Large Helical Device" IEEE Tran.MAGNETICS. Vol.32,No.4. 2244-2247 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Satow: "Stability Analysis of Advanced Superconductors for Helical Devices" Transactions on Fusion Technology. Vol.27. 575-578 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 佐藤隆: "超伝導編4.2節 超伝導マグネットの基礎技術(超伝導・低温工学ハンドブック)" オーム社, 24(1158) (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Satow: "Optimum Conditions of Stabilizer Ratio and Critical Current Margin for Maximizing the Current Density of a Tightly-wound Superconducting Magnet" IEEE Tran.Applied Superconductivity. Vol.3, No.1. 539-542 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Takahata: "Stability of Cable-in-conduit Superconductors for Large Helical Device" IEEE Tran.Applied Superconductivity. Vol.3, No.1. 511-514 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Takahata: "Stability Tests of the Nb-Ti Cable-in-Conduit Superconductor with Bare Strands for Demonstration of the Large Helical Device Poloidal Field Coils" IEEE Tran.MAGNETICS. Vol.30, No.4. 1705-1709 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Satow: "Practical Design Criterion of a Superconducting Magnet wound from Cable-in-conduit Conductors with a Copper Matrix" 1994 Applied Superconductivity Conference. LQC-1, Boston. (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Satow: "Cooling and Excitation Tests of an Inner Vertical Coil for the Large Helical Device" IEEE Tran.MAGNETICS. Vol.32, No.4. 2244-2247 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Takahata: "Cooldown Performance of an Inner Vertical Field Coil for the Large Helical Device" IEEE Tran.MAGNETICS. Vol.32, No.4. 2244-2247 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Satow: "Stability Analysis of Advanced Superconductors for Helical Devices" Transactions on Fusion Technology. Vol.27. 575-578 (1995)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-09  

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