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MHD Stability of Fusion Plasma with Ferromagnetic Wall Effect

Research Project

Project/Area Number 15560720
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Nuclear fusion studies
Research InstitutionJapan Atomic Energy Research Institute

Principal Investigator

KURITA Gen-ichi  JAERI, Division of Thermonuclear Fusion, Principal Scientist, 炉心プラズマ研究部, 主任研究員 (60354560)

Co-Investigator(Kenkyū-buntansha) TUDA Takashi  JAERI, Division of Thermonuclear Fusion, Principal Scientist, 炉心プラズマ研究部, 主任研究員 (10354581)
Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2004: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2003: ¥800,000 (Direct Cost: ¥800,000)
Keywordstokamak / critical beta / ferromagnetic wall / relative permeability / resistive wall mode / low activation material / plasma dissipation / plasma rotation / 負帰還制御 / MHD安定性 / ベータ限界 / 強磁性体壁材料 / 安定窓 / トロイダルプラズマ流 / 外部理想キンクモード
Research Abstract

Two important issues in developing the fusion DEMO reactor are the realization of high beta plasma and the development of low activation materials. As for the low activation materials, the ferritic steel is considered to be the most promising candidate as the structural material in DEMO reactor. Because of its strong ferromagnetism, however, the ferritic steel is also considered to have a bad influence to plasma ignition, control, MHD stability and plasma confinement etc.. Among others, MHD stability is related directly to the realization of high beta plasma, and the ferritic steel has possibility to deteriorate MHD stability and decrease the critical beta value. It is, therefore, one of the most important issues in development of fusion reactor to investigate the ferromagnetic effect on the MHD stability. The purpose of this study is to investigate the effect of ferromagnetic effect on critical beta by MHD stability analyses for low aspect ratio and circular cross section equilibrium … More using linear MHD stability code, which uses the full set of resistive MHD equations. The obtained results in these studies are in the following :
The reduction of critical beta by the effect of ferromagnetism is shown to be 8 % and 20 % against the ferromagnetic wall of relative permeability of 2 and 3, respectively, for tokamaks of aspect rate 3. The reduction value is 10 % against the ferromagnetic wall of relative permeability of 2 for high aspect ratio tokamaks, and the toroidal effect is considered to be small for ferromagnetic effect on the critical beta. It is shown that the attraction of the perturbed poloidal magnetic field due to ferromagnetism in the wall destabilizes the external kink mode, and reduces the critical beta values.
The existence of the stability window in the minor radius of resistive wall opened by both effects of the toroidal plasma rotation and the plasma dissipation is shown for tokamaks of aspect ratio 3, while they have not been observed for high aspect ratio tokamaks. The width of stability window is shown to be widened in small values of relative permeability less than 3, while it is shown that the width of stability window is reduced in large values of relative permeability greater than 3. The stabilization effect comes from the coupling the unstable mode to the stable mode, whose reduction rate is decreased by the ferromagnetism. Less

Report

(3 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • Research Products

    (6 results)

All 2004 2003 Other

All Journal Article (5 results) Publications (1 results)

  • [Journal Article] Critical β analyses with ferromagnetic and plasma rotation effects and wall geometry for a high p steady state tokamak2004

    • Author(s)
      G.Kurita, J.Bialek, T.Tuda, et al.
    • Journal Title

      Plasma Physics and Controlled Nuclear Fusion Research 2004(Proc.20^<th> Int.Conf.Vilamoura,2004) FTP7/7

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Critical β analyses with ferromagnetic and plasma rotation effects and wall geometry for a high β steady state tokamak2004

    • Author(s)
      G.Kurita, J.Bialek, T.Tuda, et al.
    • Journal Title

      Plasma Physics and Controlled Nuclear Fusion Research 2004 (Proc.20th Int.Conf.) (Vilamoura)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Critical β analyses with ferromagnetic and plasma rotation effects and wall geometry for high β steady state tokamak2004

    • Author(s)
      G.Kurita, J.Bialek, T.Tuda, et al.
    • Journal Title

      Plasma Physics and Controlled Nuclear Fusion Research 2004(Proc.20th Int.Conf.Vilamoura, 2004) FTP7/7

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Ferromagnetic and resistive wall effect on the beta limit in a tokamak2003

    • Author(s)
      G.Kurita, T.Tuda, M.Azumi, et al.
    • Journal Title

      Nuclear Fusion 43

      Pages: 949-954

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Ferromagnetic and resistive wall effect on the beta limit in a tokamak2003

    • Author(s)
      G.Kurita, T.Tuda, M.Azumi, et al.
    • Journal Title

      Nucl. Fusion vol.43

      Pages: 949-954

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] G.Kurita, T.Tuda, M.Azumi, S.Ishida, S.Takeji, A.Sakasai, M.Matsukawa, T.Ozeki, M.Kikuchi: "Ferromagnetic and resistive wall effects on the beta limit in a tokamak"Nuclear Fusion. 43号. 949-954 (2003)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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