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Theoretical study on production of super high beta plasmas by rotating magnetic field

Research Project

Project/Area Number 12680496
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Nuclear fusion studies
Research InstitutionKansai University

Principal Investigator

OHNISHI Masami  Kansai Univ., Faculty of Engineering, Prof., 工学部, 教授 (80089119)

Co-Investigator(Kenkyū-buntansha) YAMAMOTO Yasushi  Kyoto Univ., Institute of Advanced Energy, Associate Prof., エネルギー理工学研究所, 助教授 (50158309)
ISHIDA Akio  Niigata Univ., Faculty of Science, Prof., 理学部, 教授 (30108013)
OKAMOTO Masao  Institute for Fusion Science, Prof., 核融合科学研究所, 教授 (70115541)
Project Period (FY) 2000 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 2002: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2001: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2000: ¥1,400,000 (Direct Cost: ¥1,400,000)
Keywordsrotating magnetic field / sustaining a configuration / field-reversed configuration / current drive / partial / full penetration of RMF / stability of equilibrium operation / rigid rotor model / criterion of full penetration of RMF / 回転磁場による電流駆動 / 回転磁場の浸透 / 平衡動作点の安定性 / FRC / 磁場の浸透 / 数値シミュレーション / 高ベータプラズマ
Research Abstract

The stability of the rotation of the ion and electron fluids is studied on the balance of the forces exerted on the electrons by the resistive friction and the Rotating Magnetic Field (RMF) applied for the sake of maintaining Field Reversed Configuration (FRC) in steady state. The simple analytical model such as infinite-long plasma, rigidly rotating ions and electrons and uniform plasma density are used. The linear stability analysis of the equilibrium rotation is carried out in the reduced zero-dimensional model which includes the effects of ion rotation, radial plasma flow and separatrix radius change due to the flux conservation within the flux conserver. The analytical expression which gives the stability criterion is derived from the eigenvalues of the linearized equations. Based upon the stability criterion, an interpretation of the present experimental results and comments of the future experiments are given as for the penetration of the RMF into the FRC.
The transient behaviors … More of current drive with an RMF in an FRC are studied by numerically solving the rate equations for the ion and electron rotations with the non-equilibrium initial values. The dynamic responses are investigated by introducing the perturbation into the equilibrium ion and electron rotations in order to examine the stability around the equilibrium of the shallow penetration of an RMF. The electron rotation on the stable equilibrium of the shallow penetration remains to be near the initial equilibrium so long as the perturbation is small. On the other hand, the electron rotation in the unstable equilibrium increases to be synchronous with an RMF and to result in the full penetration for the positive perturbation and decreases further behind an RMF for the negative one. The results are consistent with the linear stability analysis.
The criterion for the penetration of an RMF in an FRC is derived theoretically on a physical base that the driving force of an RMF acting directly on an electron fluid must exceed the ion drag force throughout the process for the electron fluid to reach the synchronous rotation with the RMF, resulting in the full penetration of RMF in an FRC. The criterion explains the numerical simulation results and the experimental observations better than those previously used. The criterion is also useful for the guide of the experiments of making a hot FRC in a steady state by applying a rotating magnetic field. Less

Report

(4 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] M.Ohnishi, A.Ishida: "Study of equilibrium operation by rotating magnetic field current drive in field-reversed configuration"Proc.14^<th> US-Japan Workshop on Physics of Compact Toroid Plasma. 6 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M.Ohnishi, A.Ishida: "Stability of equilibrium in rotating magnetic field current drive for sustaining field-reversed configuration"Physics of Plasmas. Vol.9, No6. 2633-2638 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 水野雅継, 大西正視他: "逆磁場配位における回転磁場による電流駆動の安定性解析"第4回核融合エネルギー講演会. 48 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M.Ohnishi, H.Osawa, M.Mizuno, A.Ishida: "Accessibility to equilibrium with sallow/deep penetration in rotating magnetic field currnt drive"Proc.15^<th> US-Japan Workshop on Compact Toroid Plasmas. 6 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M. Ohnishi, A. Ishida: "Study of equilibrium operation by rotating magnetic field current drive in field-reversed configuration"Proc. 14^<th> US-Japan Workshop on Physics of Compact Toroid Plasmas. 6 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M. Ohnishi, A. Ishida: "Stability of equilibrium in rotating magnetic field current drive for sustaining field-reversed configuration"Physics of Plasmas. Vol. 9, No. 6. 2633-2638 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M. Mizuno, M. Ohnishi, et al.: "Stability analysis of current drive by rotating magnetic field in field-reversed configuration"Proc. 4^<th> Joint Symposium of Fusion Energy. 48 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M. Ohnishi, H. Osawa, M. Mizuno, A. Ishida: "Accessibility to equilibrium with shallow/deep penetration in rotating magnetic field current drive"Proc. 15^<th> US-Japan Workshop on Physics of Compact Toroid Plasmas. 6 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M.Ohnishi, A.Ishida: "Study of equilibrium operation by rotating magnetic field current drive in field-reversed configuration"Proc.14^<th> US-Japan Workshop on Physics of Compact Toroid Plasma. 18-24 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Ohnishi, A.Ishida: "Stability of equilibrium in rotating magnetic field current drive for sustaining field reversed configuration"Physics of Plasmas. Vol.9,No.6. 2633-2638 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 水野雅継, 大西正視, 大澤穂高他: "逆磁場配位における回転磁場による電流駆動の安定性"第4回核融合エネルギー講演会. 48 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Ohnishi, H.Osawa, M.Mizuno, A.Ishida: "Accessibility to equilibrium with shallow/deep penetration in rotating magnetic field current drive"Proc.15^<th> US-Japan Workshop on Compact Toroid Plasmas. 30-36 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Ohnishi, A.Ishida: "Stability of Equilibrium in Rotating Magnetic Field Current Drive for Sustaining Field-Reversed Configuration"Physics of Plasmas. (印刷中). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] M.Ohnishi, A.Ishida: "Study of Equilibrium Operation by Rotating Magnetic Filed Current Drive in Field-Reversed Configuration"Proc. US-Japan workshop on CT plasma physics. (印刷中). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] 北垣次郎,大西正視 他: "Evolution of Rield-Reversed Configuration Plasma with Roating Magentic Field"電気学会論文誌A. 120巻3号. 342-349 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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