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Dynamic behavior of structure trnsition phenomena in nonequilibrium and nonlinear plasmas in open systems

Research Project

Project/Area Number 11837021
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research InstitutionNational Institute for Fusion Science

Principal Investigator

HAYASHI Takaya  Natiomal Institute for Fusion Science Theory and Computer Simlation Center, Professor, 理論・シミュレーション研究センター, 教授 (60156445)

Co-Investigator(Kenkyū-buntansha) MIZUGUCHI Naoki  NIFS,Theory and Computer Simlation Center,Research Associated, 理論・シミュレーション研究センター, 助手 (70332187)
MIURA Hideaki  NIFS,Theory and Computer Simlation Center,Research Associated, 理論・シミュレーション研究センター, 助手 (40280599)
WATANABE Tomohiko  NIFS,Theory and Computer Simlation Center,Associated Professor, 理論・シミュレーション研究センター, 助教授 (30260053)
Project Period (FY) 1999 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2001: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2000: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1999: ¥1,800,000 (Direct Cost: ¥1,800,000)
Keywordscomplexity / intermittent relaxation phenomena / structure transition / nonequilibrium / magnetohydrodynamic plasma / spherical tokamak / helical plasma / computer sumulation / 動的挙動
Research Abstract

Nonlinear MHD simulations on relaxation phenomena in spherical tokamak and helical plasmas, including 3D HINT equilibrium computations, are executed. The dynamics of global relaxation phenomena in spherical tokamak have been revealed. We analyze the sawtooth and the internal reconnection event (IRE). For the sawtooth case, a new nonlinear trigger mechanism is found, in which the n=1 activity in the core region is subsequently excited by development of higher n ballooning modes in the periphery region. After a process of pressure collapse, the torus returns to a state close to the axisymmetric initial configuration but with a broader pressure profile. The overall shape of the torus surface does not change throughout the event. On the other hand, simulations for IRE show a large distortion of the torus. The differences arise from only slight discrepancies in the initial profiles. The 3D equilibrium code HINT, which does not assume the existence of magnetic surfaces, is modified in a couple of directions to extend the functions. A new MHD simulation code for a full three dimensional geometry of helical plasmas were developed. A relaxation phenomenon driven by pressure driven instabilities in the LHD configuration was observed, which was not destructive but caused transition to a new equilibrium. An initial phase of plasma deformations is dominated by medium-n resistive ballooning instability. In the later stage, a well-confined state is recovered by having spontaneous evolution to a broader pressure profile. Virtual reality display system was developed as an advanced visualization method to understand complex phenomena.

Report

(4 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • Research Products

    (33 results)

All Other

All Publications (33 results)

  • [Publications] Hayashi Takaya: "Island formation for finite pressure equilibria in non-axisymmetric tori"Contribution for Plasma Physics. (in print). (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Miura Hideaki: "Nonlinear simulation of resistive ballooning modes in Large Helical Device"Physics of Plasmas. 8・11. 4870-4878 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Hayashi Takaya: "Computer Simulation of Nonlinear Phenomena in Plasmas"Computer Physics Communications. 142・12. 49-54 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Hayashi Takaya: "Magnetic Reconnection and Relaxation Phenomena in Spherical Tokamak"Earth Planets Space. 53・6. 561-564 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Hayashi Takaya: "Recent Progress in Simulation Study of Magnetically Confined Plasmas"Journal of Plasma and Fusion Research. 77・6. 521-524 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Hayashi Takaya: "Formation of Magnetic Islands in 3D Equilibaria of Helical Plasmas"Journal of Plasma and Fusion Research. 77・6. 594-600 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Hayashi Takaya: "Relaxation phenomena in spherical tokamak"Progress of Theoretical Physics Supplement. 138. 712-713 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Miura Hideaki: "Nonlinear simulation of resistive ballooning modes in Large Helical Device"Physics of Plasmas. 8-11. 4870-4878 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Tamura Yuichi: "Virtual reality system to visualize and auralize numerical simulation data"Computer Physics Communications. 142-12. 227-230 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Hayashi Takaya: "Magnetic Reconnection and Relaxation Phenomena in Spherical Tokamak"Earth Planets Space. 53-6. 561-564 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Rowena Ball: "Understanding critical behavior through visualization : A walk around the pitchfork"Computer Physics Communications. 142-12. 71-75 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Hayashi Takaya: "Island formation for finite pressure equilibria in nonaxisymmetric tori"Contribution for Plasma Physics. (in print). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Hayashi Takaya: "Computer Simulation of Nonlinear Phenomena in Plasmas"Computer Physics Communications. 142-12. 49-54 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Hayashi Takaya: "Recent progress in simulation study of magnetically confined plasmas"Journal of Plasma and Fusion Research. 77-6. 521-524 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Suzuki Yoshio: "Deceleration mechanism of spheromak-like compact toroid penetrating into magnetized plasmas"Physic of Plasmas. 7-12. 5033-5037 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Hayashi Takaya: "Island formation for finite pressure equilibria in non-axisymmetric tori"Contribution for Plasma Physics. (In print). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] Miura Hideaki: "Nonlinear simulation of resistive ballooning modes in Large Helical Device"Physics of Plasmas. 8・11. 4870-4878 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Hayashi Takaya: "Computer Simulation of Nonlinear Phenomena in Plasmas"Computer Physics Communications. 142・12. 49-54 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Hayashi Takaya: "Magnetic Reconnection and Relaxation Phenomena in Spherical Tokamak"Earth Planets Space. 53・6. 561-564 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Hayashi Takaya: "Recent Progress in Simulation Study of Magnetically Confined Plasmas"Journal of Plasma and Fusion Research. 77・6. 521-524 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Hayashi Takaya: "Formation of Magnetic Islands in 3D Equilibria of Helical Plasmas"Journal of Plasma and Fusion Research. 77・6. 594-600 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Hayashi Takaya: "ヘリカル系プラズマ3次元平衡における磁気島"プラズマ核融合学会誌. (印刷中). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Hayashi Takaya: "Computer Simulation of Nonlinear Phenomena in Plasmas"Computational Physics Communication. (In print). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Hayashi Takaya: "Dynamics of Relaxation Phenomena in Spherical Tokamak"Fusion Energy. (In print). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Hayashi Takaya: "Relaxation Phenomena in Spherical Tokamak"Progress of Theoretical Physics Supplement. No.138. 712-713 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Watanabe Tomohiko: "Nondissipative kinetic simulation and analytical solution of three-mode equations of the ion temperature gradient instability"Physics of Plasmas. 7,3. 984-990 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Suzuki Yoshio: "Deceleration mechanism of spheromak-like compact toroid penetrating into magnetized plasmas"Physics of Plasmas. 7,12. 5033-5037 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Takaya Hayashi: "Computer simulation of internal reconnection event in spherical tokamak"Nuclear Fusion. 40, 3. 721-728 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Takaya Hayashi: "Relaxation phenomena in spherical tokamak"Progress of Theoretical Physics. (In press). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Naoki Mizuguchi: "Dynamics of Spherical Tokamak Plasma on Internal Reconnection Event"Physics of Plasmas. 7, 3. 940-949 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Tomohiko Watanabe: "Two-Dimensional MHD Simulation of Merging Plasmas in Laboratory Experiments - Focussing on Its Dynamic Behaviors"J. Plasma Phys. Fusion Res.. 75, 9. 1119-1119 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Tomohiko Watanabe: "Modeling of magnetic island formation in magnetic reconnection experiment"Physics of Plasmas. 6, 8. 1253-1257 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Takaya Hayashi: "Self-Organizing Plasmas"Plasma Phys. Control. Fusion. 41, 4. 229-238 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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