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Study of Self organization of current hole in high confinement plasma

Research Project

Project/Area Number 15340203
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Plasma science
Research InstitutionJapan Atomic Energy Agency

Principal Investigator

OZEKI Takahisa  Japan Atomic Energy Agency, Fusion Research and Development Directorate, Senior Principal Researcher, 核融合研究開発部門, 研究主席 (50354577)

Co-Investigator(Kenkyū-buntansha) FUJITA Takaaki  Japan Atomic Energy Agency, Fusion Research and Development Directorate, Principal Researcher, 核融合研究開発部門, 研究主幹 (70354602)
TAKIZUKA Tomonori  Japan Atomic Energy Agency, Fusion Research and Development Directorate, Assistant Principal Researcher, 核融合研究開発部門, 研究副主幹 (40354576)
TUDA Takashi  Japan Atomic Energy Agency, Fusion Research and Development Directorate, Principal Researcher, 核融合研究開発部門, 研究職 (10354581)
NAKAMURA Yukiharu  Japan Atomic Energy Agency, Fusion Research and Development Directorate, Principal Researcher, 核融合研究開発部門, 研究主幹 (80354570)
HAYASHI Nobuhiko  Japan Atomic Energy Agency, Fusion Research and Development Directorate, Researcher, 核融合研究開発部門, 研究職 (10354573)
栗田 源一  特殊法人日本原子力研究所, 炉心プラズマ研究部, 主任研究員 (60354560)
Project Period (FY) 2003 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥14,700,000 (Direct Cost: ¥14,700,000)
Fiscal Year 2005: ¥4,400,000 (Direct Cost: ¥4,400,000)
Fiscal Year 2004: ¥4,800,000 (Direct Cost: ¥4,800,000)
Fiscal Year 2003: ¥5,500,000 (Direct Cost: ¥5,500,000)
Keywordscurrent hole / tokamak / plasma / self-organization / heat / particle transport / MHD / simulation
Research Abstract

Purpose of this study is to clarify the mechanism of self-organization of current hole observed in JT-60U large tokamak. The following results are obtained.
1.Tri-magnetic island (ATMI) model is proposed as equilibrium with nearly zero current around the plasma center. The condition of the stable existence of the ATMI model is obtained.
2.MHD stability of plasmas with strongly hollow current profile like the current hole is investigated. Analysis shows that the possibility to obtain the high beta plasma (β_N>4) by tailoring the pressure profile and the current profile such as the pressure gradient exists in the strong reversed shear region.
3.Formation and sustainment of the current hole are investigated by the comparison of simulations of the 1.5 dimension transport code using the ATMI equilibrium model with experimental observations in JT-60U. Results show that both of the formation of strong internal transport barrier (ITB) and the rapid drop of the anomalous transport makes a self-organization of the current hole by the penetration of the negative electric field due to the increase of the local bootstrap current. Also, the energy confinement law within the current hole and the property of the sustainment by using the current drive are clarified.
4.By the MHD simulation, the response to the plasma with negative electric field is investigated, and the formation of the pair vortices is obtained as an explanation of the current hole. The interaction of the pair vortices and the residual magnetic field removes the negative electric field.
The current hole plasma has the strong ITB and the neo-classical level transport near the plasma center, also it has a possibility to become a very high beta by tailoring the pressure and current profiles. Therefore, the tokamak fusion reactor using the current hole has a potential to become an extremely high efficiency reactor.

Report

(4 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • Research Products

    (25 results)

All 2006 2005 2004 Other

All Journal Article (23 results) Book (1 results) Publications (1 results)

  • [Journal Article] Integrated Simulation Code for Burning Plasma Analysis2006

    • Author(s)
      T.Ozeki, et al.
    • Journal Title

      Fusion Sci. and Tech. 49(in press)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Physics of Strong Internal Transport Barriers In JT-60U Reversed-Magnetic-Shear Plasmas2006

    • Author(s)
      N.Hayashi, et al.
    • Journal Title

      Plasma Physics and Controlled Fusion 48

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Integrated Simulation Code for Burning Plasma Analysis2006

    • Author(s)
      Ozeki, N.Aiba, N.Hayashi, T.Takizuka, M.Sugihara, N.Oyama
    • Journal Title

      Fusion Sci. and Tech.Phys July(in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Physics of Strong Internal Transport Barriers in JT 60U Reversed-Magnetic-Shear Plasmas2006

    • Author(s)
      N.Hayashi, T.Takizuka, Y.Sakamoto, T.Fujita, Y.Kamada, S.Ide, Y.Koide
    • Journal Title

      Plasma Physics and Controlled Fusion 48

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Profile Formation and Sustainment of Autonomous Tokamak Plasma with Current Hole Configuration2005

    • Author(s)
      N.Hayashi, et al.
    • Journal Title

      Nuclear Fusion 45

      Pages: 933-941

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Current Clamp at Zero Level in JT-60U Current Hole Plasmas2005

    • Author(s)
      T.Fujita.et al.
    • Journal Title

      Physical Review Letters 95

      Pages: 175001-175001

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Role of double tearing mode on the formation of Current Hole2005

    • Author(s)
      T.Tuda, et al.
    • Journal Title

      Proc. 19th International Conference on Numerical Simulation of Plasmas and 7TH Asia pacific Plasma Theory Conference, P2-21

      Pages: 88-88

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Profile Formation and Sustainment of Autonomous Tokamak Plasma with Current Hole Configuration2005

    • Author(s)
      N.Hayashi, T.Takizuka, T.Ozeki
    • Journal Title

      Nuclear Fusion 45

      Pages: 933-941

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Current Clamp at Zero Level in JT 60U Current Hole Plasmas2005

    • Author(s)
      T.Fujita, et al.
    • Journal Title

      Physical Review Letters 95

      Pages: 75001-75001

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Role of double tearing mode on the formation of Current Hole2005

    • Author(s)
      T.Tuda, G.Kurita, T.Fujita
    • Journal Title

      Proc.19th International Conference on Numerical Simulation of Plasmas and 7TH Asia pacific Plasma Theory Conference 88

      Pages: 2-21

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Current Clamp at Zero Level in JT-60U Current Hole Plasmas2005

    • Author(s)
      T.Fujita, et al.
    • Journal Title

      Physical Review Letters 95

      Pages: 75001-75001

    • Related Report
      2005 Annual Research Report
  • [Journal Article] MHD Stability based on Transport Analyis2005

    • Author(s)
      T.Ozeki, et al.
    • Journal Title

      Proc.32th EPS Conf.Controlled Fusion and Plasma Physics (CD-ROM)

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Roles of Double Tearing Mode on the Formation of Current Hole2005

    • Author(s)
      T.TUDA, G.KURITA, T.FUJITA
    • Journal Title

      Proc.19th International Conference on Numerical Simulation of Plasmas and 7TH Asia pacific Plasma Theory Conference P2-21

      Pages: 236-237

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Stability of Double Tearing Mode in the Current Hole Configuration2005

    • Author(s)
      T.TUDA, G.KURITA, T.FUJITA
    • Journal Title

      Proc.5th Asia Plasma Fusion Association TP5

      Pages: 88-88

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Analysis of MHD Stability for JT-60U Plasmas with Current Hole2005

    • Author(s)
      T.Ozeki, et al.
    • Journal Title

      JAEA-Review 2005-005

      Pages: 111-111

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Stiffness of Central Current and Temperature Profiles in JT-60U Current Hole Plasmas2004

    • Author(s)
      T.Fujita.et al.
    • Journal Title

      Fusion Energy 2004 (Proc. 20th Int. Conf. Vilamoura, 2004) (Vienna; IAEA) CD-ROM

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Stiffness of Central Current and Temperature Profiles in JT 60U Current Hole Plasmas2004

    • Author(s)
      T.Fujita, et al.
    • Journal Title

      in Fusion Energy 2004 (Proc.20th Int.Conf.Vilamoura,2004)(Vienna ; IAEA) CD-ROM file EX/P4-3

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Current profile behavior during ramping-up phase in high bootstrap current tokamak plasmas2004

    • Author(s)
      Y.Nakamura, et al.
    • Journal Title

      J.Plasma Fusion Res. SERIES, Vol.6

      Pages: 196-196

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Alpha Particle Loss and Neutral Beam Current Drive in Fusion Plasma with Central Current Hole2004

    • Author(s)
      Tobita, T.Ozeki, Y.Nakamura
    • Journal Title

      Plasma Phys.Control.Fusion 46

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Axisymmetric MHD simulation of ITB crash and following disruption dynamics of tokamak plasmas with high bootstrap current2004

    • Author(s)
      N.Takei, Y.Nakamura, Y.Kawano, H.Tsutsui, T.Ozeki, et al.
    • Journal Title

      J.Plasma Fusion Res. SERIES, Vol.6

      Pages: 554-554

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Stiffness of Central Current and Temperature Profiles in JT-60U Current Hole Plasmas2004

    • Author(s)
      T.Fujita, T.Suzuki, T.Oikawa, et al.
    • Journal Title

      Proc.20th Int.Conf.on Fusion Energy 2004 (CD-ROM)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Profile Formation and Sustainment of Autonomous Tokamak Plasma with Current Hole Configuration2004

    • Author(s)
      N.Hayashi, T.Takizuka, T.Ozeki
    • Journal Title

      Proc.20th Int.Conf.on Fusion Energy 2004 (CD-ROM)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Pair Vortices Formation near Magnetic Axis as an Explanation of the "Current Hole" Sustainment2004

    • Author(s)
      T.Tuda, G.Kurita, T.Fujita
    • Journal Title

      Proc.20th Int.Conf.on Fusion Energy 2004 (CD-ROM)

    • Related Report
      2004 Annual Research Report
  • [Book] 臨床消火器内科182004

    • Author(s)
      中村 稔, 下田慎治, 石橋大海
    • Related Report
      2004 Annual Research Report
  • [Publications] 滝塚 知典: "トカマクにおける電流分布の可能性-電流ホール配位の形成機構と閉じ込め特性-"J.Plasma Fusion Res.. Vo70 No.11. 1123-1129 (2003)

    • Related Report
      2003 Annual Research Report

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

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