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Analysis of Magnetic Helicity Injection by RF Waves

Research Project

Project/Area Number 01580011
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field プラズマ理工学
Research InstitutionOkayama University

Principal Investigator

FUKUYAMA Atsushi  Okayama University, Faculty of Engineering Associate professor, 工学部, 助教授 (60116499)

Co-Investigator(Kenkyū-buntansha) TOTSUJI Hiroo  Okayama University, Faculty of Engineering Professor, 工学部, 教授 (40011671)
FURUTANI Yoichiro  Okayama University, Faculty of Engineering Professor, 工学部, 教授 (70108124)
Project Period (FY) 1989 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1990: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1989: ¥800,000 (Direct Cost: ¥800,000)
KeywordsNuclear Fusion / Plasma / Tokamak / Current Drive / magnetic Helicity / Electromagnetic wave
Research Abstract

The mechanism of magnetic helicity injection and current drive by RF waves was studied both analytically and numerically.
1. Current drive via non-resonant interaction between RF waves and plasma studied in a stationary state. The non-resonant interaction generates a non-conservative force, in addition to the usual conservative ponderomotive force. The force of our concern mainly acts as an internal force among plasma species ; the net momentum input from the wave to the plasma is small in this process. The current drive by this process is different from the conventional RF current drive schemes based on resonant wave-particle interactions, and is associated with the change of RF wave helicity.
2. A one-dimensional wave code was extended to calculate the driven current associated with the nonresonant force. The analysis is applied to ICRF waves in a large tokamak. The profiles of driven current and helicity absorption were obtained. It was confirmed that the local current drive efficiency is independent of the plasma density and strongly depends on the temperature. The global current drive efficiency, however, depends on central density owing to the change of propagation and absorption structure.
3. Current drive by the helicity injection via a plasma surface requires spatial diffusion of the current. In order to study the mechanism of the current diffusion in a tokamak, we have developed a three-dimensional bounce-averaged Fokker-Planck code. This code was used to simulate the electron cyclotron current drive experiment. The broadening of the current profile and the reduction of the current drive efficiency have been observed by including spatial diffusion of fast electrons.

Report

(3 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] A.Fukuyama: "ThreeーDimensional FokkerーPlanck Analysis on RF Current Drive in Tokamaks" Proc.of 17th EPS Conf.on Controlled Fusion and Plasm Heating.14BーIII. 1251-1254 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] A.Fukuyama: "Nonresonant Current Drive by RF Helicity Injection" Proc.of 13th Iht.Conf.in Plasma Physics and Controlled Nuclear Fusion Resarch,IAEAーCNー53/Iー2ー4. (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] A.Fukuyama: "Dynamic Response of Stationary Burning Plasma" Proc.of 13th Int.Conf.on Plasma Physics and Controlled Nuclear Fusion Research,IAEAーCNー53/Gー2ー7. (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] A.Fukuyama: "NonーResonant Current Drive and Helicity Injection by RF Waves"

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] A.Fukuyama: "ThreeーDimensional FokkerーPlanck Analysis of Electron Cyclotron Current Drive in a Tokamak"

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] A. Fukuyama: "Three-Dimensional Fokker-Planck Analysis on RF Current Drive in Tokamaks" Proc. of 17th EPS Conf. on Controlled Fusion and Plasm Heating. Vol. 14B, part III. 1251-1254

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] A. Fukuyama: "Non-resonant Current Drive by RF Helicity Injection" Proc. of 13th Int. Conf. on Plasma Physics and Controlled Nuclear Fusion Research. IAEA-CN-53/I-2-4.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] A. Fukuyama: "Dynamic Response of Stationary Burning Plasma" Proc. of 13th Int. Conf. on Plasma Physics and Controlled Nuclear Fusion Research. IAEA-CN-53/G-2-7.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] A. Fukuyama: "Non-Resonant Current Drive and Helicity Injection by RF Waves"

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] A. Fukuyama: "Three-Dimensional Fokker-Planck Analysis of Electron Cyclotron Current Drive in a Tokamak"

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] K.Hamamatsu: "ICRF Current Drive and Helicity Injection" Phys.Fluids.

    • Related Report
      1990 Annual Research Report
  • [Publications] A.Fukuyama: "Nonresonant Current Drive by RF Helicity Injection" Proc.of 13th Int.Conf.on Plasma Physics and Controlled Nuclear Fusion Research. IAEAーCNー53/Iー2ー4. (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] A.Fukuyama: "NonーResonant Current Drive and Helicity Injection by RF Waves"

    • Related Report
      1990 Annual Research Report
  • [Publications] A.Fukuyama: "ThreeーDimensional FokkerーPlanck Analysis of Electron Cyclotron Current Drive in a Tokamak"

    • Related Report
      1990 Annual Research Report
  • [Publications] A.Fukuyama: "Three-Dimensional Fokker-Planck Analysis of Electron Cyclotron Current Drive in a Tokamaka" Journal of Physical Society of Japan.

    • Related Report
      1989 Annual Research Report
  • [Publications] K.Hamamatsu: "Rf Heliclty Injection and Current Drive" Physics of Fluids.

    • Related Report
      1989 Annual Research Report

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Published: 1989-04-01   Modified: 2016-04-21  

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