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Structure Change in Toroidal Plasma Due to Nonlinear Evolution of Pressure Driven Mode

Research Project

Project/Area Number 13680572
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Nuclear fusion studies
Research InstitutionNational Institute for Fusion Science

Principal Investigator

ICHIGUCHI Katsuji  National Institute for Fusion Science, Department of Large Helical Device Project, Associate Professor, 大型ヘリカル研究部, 助教授 (90211739)

Project Period (FY) 2001 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2004: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2003: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2002: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2001: ¥900,000 (Direct Cost: ¥900,000)
Keywordsmagnetically confined fusion plasma / heliotron / Large Helical Device (LHD) / magnetohydrodynami.cs (MHD) / reduced MHD equations / interchange mode / nonlinear analysis / magnetic reconnection / 圧力駆動型モード / 非線型シミュレーション / 磁気島 / MHD(電磁流体力学) / 非線型計算 / 簡約化方程式 / LHD(大型ヘリカル装置) / 圧力平坦化 / プラズマ / トーラス / 非線型発展 / MHD / 自己組織化
Research Abstract

The comprehensive understanding of the MHD stability of the toroidal plasma has been aimed in the view point of the structure change in the profiles of pressure and the magnetic configuration induced in the nonlinear evolution of the pressure driven mode. The heliotron plasma is focused because the interchange mode is the most dangerous instability. Particularly, in the LHD experiments, good confinement is observed in the region linearly unstable for the interchange mode, and therefore, the stabilizing mechanism is pursued.
In order to carry out the analysis, a nonlinear numerical code, NORM, is developed based on the reduced MHD equations. At first, the nonlinear evolution of a low beta plasma which is slightly unstable for the linear ideal interchange mode is examined In this case, the mode is saturated mildly without any disruptive phenomenon. The pressure profile has local flat regions around the resonant surfaces. This structure change reduces the driving force and leads to the mild saturation. Next, the nonlinear evolution of the plasma with the same pressure profile and high beta value is examined. In this case, a disruptive phenomenon is obtained. This is because the enhancement of the driving force causes an overlap of the vortices. However, since the pressure profile has to change continuously in the actual experiments, the plasma with the saturated pressure profile at the lower beta value and the high beta value is examined. In this case, the plasma is saturated without the disruptive phenomenon. These results indicate that the LHD plasma is self-organized so that the stable pressure profile can be achieved in the increase of the beta value.
When the local flat region is generated in the pressure profile, the magnetic islands are generated simultaneously. The generation is attributed to the driven reconnection which is induced by the vortices of the interchange mode. The number of the islands is twice of the poloidal mode number of the driving mode.

Report

(5 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • Research Products

    (22 results)

All 2005 2004 2003 2002 Other

All Journal Article (19 results) Publications (3 results)

  • [Journal Article] Non-Disruptive MHD Dynamics in Inward-Shifted LHD Configurations2005

    • Author(s)
      H.Miura, K.Ichiguchi et al.
    • Journal Title

      Proceedings of 20^<th> IAEA Fusion Energy Conference, Vilamoura, Portugal, 1-6 Novemer 2004 IAEA-CN-116

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Non-Disruptive MHD Dynamics in Inward-Shifted LHD Configurations2005

    • Author(s)
      H.Miura, K.Ichiguchi, N.Nakajima, T.Hayashi, B.A.Carreras
    • Journal Title

      Proceedings of 20th IAEA Fusion Energy Conference, Vilamoura, Portugal, 1-6 Novemer 2004 IAEA-CN-116

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Effects of Self-Consistent Flow on Island Generation in Interchenge Mode2004

    • Author(s)
      K.Ichiguchi, B.A.Carreras
    • Journal Title

      Journal of Plasma and Fusion Research SERIES Vol.6

      Pages: 589-592

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Nonlinear Analysis for Stablization of Interchange Mode in LHD Plasma2004

    • Author(s)
      K.Ichiguchi et al.
    • Journal Title

      Fusion Science and Technology Vol.46

      Pages: 34-43

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Magnetic Island Generation in Nonlinear Saturation of Interchange Mode2004

    • Author(s)
      K.Ichiguchi, B.A.Carreras
    • Journal Title

      Proceedings of 31^<st> European Physical Society Conference on Plasma Physics, London UK, 28 June-2 July 2004 Vol.28G

      Pages: 5-105

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Effects of Self-Consistent Flow on Island Generation in Interchange Mode2004

    • Author(s)
      K.Ichiguchi B.A.Carreras
    • Journal Title

      Journal of Plasma and Fusion Research SERIES Vol.6

      Pages: 589-592

    • NAID

      120005962000

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Nonlinear Analysis for Stabilization of Interchange Mode in LHD Plasmas2004

    • Author(s)
      K.Ichiguchi, N.Nakajim, B.A.Carreras
    • Journal Title

      Fusion Science and Technology Vol.46 No.1

      Pages: 34-43

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Magnetic Island Generation in Nonlinear Saturation of Interchange Mode2004

    • Author(s)
      K.Ichiguchi B.A.Carreras
    • Journal Title

      Proceedings of 31st European Physical Society Conference on Plasma Physics, London UK, 28 June-2 July 2004 Vol.28G

      Pages: 5-105

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Nonlinear Analysis for Stabilization of Interchange Mode in LHD Plasmas2004

    • Author(s)
      K.Ichiguchi et al.
    • Journal Title

      Fusion Science and Technology Vol.46

      Pages: 34-43

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Effects of Self-Consistent Flow on Island Generation in Interchange Mode2004

    • Author(s)
      K.Ichiguchi, B.A.Carreras
    • Journal Title

      Journal of Fusion and Plasma Research SERIES Vol.6

      Pages: 589-592

    • NAID

      120005962000

    • Related Report
      2004 Annual Research Report
  • [Journal Article] MHD Analysis of LHD High Beta Plasmas2003

    • Author(s)
      K.Ichiguchi, et al.
    • Journal Title

      Proceedings of 14^<th> International Stellarator Workshop, Greifswald, Germany, 22-26, September 2003

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Nonlinear MHD Analysis for LHD Plasmas2003

    • Author(s)
      K.Ichiguchi, et al.
    • Journal Title

      Nuclear Fusion Vol.43

      Pages: 1101-1109

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] MHD Analysis of LHD High Beta Plasmas2003

    • Author(s)
      K.Ichiguchi, N.Nakajima, B.A.Carreras
    • Journal Title

      Proceedings of 14th International Stellarator Workshop, Greifswald, Germany, 22-26 September 2003 I.Fr7

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Nonlinear MHD Analysis for LHD Plasmas2003

    • Author(s)
      K.Ichiguchi, N.Nakajima, M.Wakatani, B.A.Carreras, V.E.Lynch
    • Journal Title

      Nuclear Fusion Vol.43 No.10

      Pages: 1101-1109

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Nonlinear MHD Analysis for LHD Plasmas2002

    • Author(s)
      K.Ichiguchi, et al.
    • Journal Title

      Proceedings of 19^<th> IAEA Fusion Energy Conference, Lyon, France, 14-19 October 2002 IAEA-CN-94

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Effects of Net Toroidal Current Profile on the Mercier Criterion in Heliotron Plasmas2002

    • Author(s)
      K.Ichiguchi, et al.
    • Journal Title

      Nuclear Fusion Vol.42

      Pages: 557-567

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Nonlinear MHD Analysis for LHD Plasmas2002

    • Author(s)
      K.Ichiguchi, N.Nakajima, M.Wakatani, B.A.Carreras, V.E.Lynch
    • Journal Title

      Proceedings of 19th IAEA Fusion Energy Conference, Lyon, France, 14-19 October 2002 IAEA-CN-94

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Effects of net toroidal current profile on the Mercier criterion in heliotorn plasmas2002

    • Author(s)
      K.Ichiguchi, T.Nishimura, N.Nakajima, M.Okamoto, S.Oikawa, M.Itagaki
    • Journal Title

      Nuclear Fusion Vol.42 No.5

      Pages: 557-567

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Tearing Mode in a Heliotron Plasma2002

    • Author(s)
      K.Ichiguchi
    • Journal Title

      Journal of Plasma and Fusion Research SERIES Vol.5

      Pages: 491-494

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] K.Ichiguchi, et al.: "Tearing Mode in a Heliotron Plasma"Journal of Plasma and Fusion Research SERIES. Vo.5. 491-494 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] K.Ichiguchi., et al.: "Nonlinear MHD analysis for LHD Plasmas"Nuclear Fusion. Vo.43,No.10. 1101-1109 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] K.Ichiguchi et al.: "Effects of net toroidal current profile on the Mercier criterion in heliotron plasmas"Nuclear Fusion. 42. 557-567 (2002)

    • Related Report
      2002 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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