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1992 Fiscal Year Final Research Report Summary

Anomalous Diffusion of Plasma Current and Anomalous Transports Induced by Plasma Turbulence

Research Project

Project/Area Number 03680004
Research Category

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

Allocation TypeSingle-year Grants
Research Field プラズマ理工学
Research InstitutionUniversity of Tokyo,

Principal Investigator

YOSHIDA Zensho  University of Tokyo, Department of Nuclear Engineering, Associate Professor, 工学部, 助教授 (80182765)

Co-Investigator(Kenkyū-buntansha) MORIKAWA Junji  University of Tokyo, Department of Nuclear Engineering, Techincal Staff, 工学部, 教務職員 (70192375)
NIHEI Hitoshi  University of Tokyo, Departmwnt of Nuclear Engineering, Research Associate, 工学部, 助手 (70010973)
OGAWA Yuichi  University of Tokyo, Department of Nuclear Engineering, Associate Professor, 工学部, 助教授 (90144170)
INOUE Nobuyuki  University of Tokyo, Department of Nuclear Engineering, Professor, 工学部, 教授 (60023719)
Project Period (FY) 1991 – 1992
KeywordsPlasma / Turbulence / Chaos / Anomalous Transports / Helicity / MHD relaxation
Research Abstract

Heat and particle transports which are associated with the helicity transport are obtained in a current-carrying plasma. The helicity flux represents the transport of parallel current density and is produced by an electric field with a circularly polarized component. Fluctuations with circularly polarized components induce finite average in cross-field nonlinear parallel current, which leads to generation of frictional electron heat flux as well as ion nonlinear polarization current which produces particle flux. The circular polarization of the perturbed electric field thus relates the helicity flux, electron heat flux and the particle flux in such a manner that the heat and the particle transports in the direction opposite to the helicity flux. This result applies whether the helicity is injected externally by oscillating fields or it is generated internally in the plasma.
In the magnetohydrodynamic relaxation accompanying fast reconnections, magnetic fluctuations originating from kink-type instabilities yield a finite magnetic compression, and the corresponding transverse electric field is dissipated through the transit-time damping. This dissipation mechanism does not change the helicity, while it dissipates the fluctuation energy to result in direct heating of ions. This is in contrast to a slow relaxation process based on the tearing mode turbulence, where the parallel electric field is predominantly dissipated, which accompanies preferential heating of electrons and dissipation of the helicity.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] Z. Yoshida, A. Hasegawa: "Anomalous Transports Associated with the Helicity Transport in a Plasma" Physics of Fluids B. 3. 3059-3064 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Z. Yoshida: "Anomalous Impedance and Anomalous Ion Heating Due to Gyrorelaxation through Magnetohydrodynamic Fluctuations" Physics of Fluids B. 4. 1534-1538 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Z. Yoshida: "Quasiperiodic Perturbations for the Alfven-Wave Continuous Spectra" Physical Feview Letters. 68. 3168-3171 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Z. Yoshida, A. Hasegawa: "Transit-time Magnetic Pumping Induced by Spontaneous Fluctuations in a Magnetohydrodynamic Relaxation Process" Physics of Fluids B. 4. 3013-3015 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Z.Yoshida and A.Hasegawa: "Anomalous Transports Associated with the Helicity Transport in a Plasma" Physics of Fluids B. Vol.3. 3059-3064 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Z.Yoshida: "Anomalous Impedance and Anomalous IonHeating Due to Gyrorelaxation through Magnetohydro-dynamic Fluctuations" Physics of Fluids B. Vol.4. 1534-1538 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Z.Yoshida: "Quasiperiodic Perturbations for the Alfven-Wave Continuous Spectra" Physical Revies Letters. Vol.68. 3168-3171 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Z.Yoshida and A.Hasegawa: "Transit-time Magnetic Pumping Induced by Spontaneous Fluctuations in a Magnetohydrodynamic Relaxation Process" Physics of Fluids B. Vol.4. 3013-3015 (1992)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-16  

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