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Studies on the Current-Density-Dependences of Transports and Heating in Low q Current-Carrying Plasmas

Research Project

Project/Area Number 02402052
Research Category

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

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

Principal Investigator

INOUE Nobuyuki  University of Tokyo, Department of Nuclear Engineering, Professor, 工学部, 教授 (60023719)

Co-Investigator(Kenkyū-buntansha) TOYAMA Hiroshi  University of Tokyo, Department of Physics, Associate Professor, 工学部, 助教授 (50023718)
MORIKAWA Junji  University of Tokyo, Department of Nuclear Engineering, Technical Staff, 工学部, 教務職員 (70192375)
NIHEI Hitoshi  University of Tokyo, Department of Nuclear Engineering, Research Associate, 工学部, 助手 (70010973)
YOSHIDA Zensho  University of Tokyo, Department of Nuclear Engineering, Associate Professor, 工学部, 助教授 (80182765)
OGAWA Yuichi  University of Tokyo, Department of Nuclear Engineering, Associate Professor, 工学部, 助教授 (90144170)
宮本 健郎  東京大学, 理学部, 教授 (60023701)
Project Period (FY) 1990 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥29,300,000 (Direct Cost: ¥29,300,000)
Fiscal Year 1992: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1991: ¥11,500,000 (Direct Cost: ¥11,500,000)
Fiscal Year 1990: ¥15,800,000 (Direct Cost: ¥15,800,000)
KeywordsPlasma / Nuclear Fusion / Anomalous Heating / Anomalous Resistance / ULQ / Tokamak / Ion Viscosity / プラズマ・核融合 / イオン異常加熱
Research Abstract

When we increase the plasma current in a toroidal discharge, the plasma becomes unstable against kink modes. Simultaneously we observe an appreciableincrease in the effective resistance (dissipating impedance) of the discharge. The transition into a turbulent discharge resembles the appearance of a turbulent viscosity in a flow through a tube. To characterize a toroidal discharge, we use the surface safety factor q_a which is approximately proportional to the ratio of the toroidal and poloidal magnetic fields at the plasma surface. A smaller q_a, for example q_a<1, is obtained only when we apply an anomalously large loop voltage to sustain the discharge. An experimental scaling law of the anomalous impedance has been established. Expentimantal and theoretical analyzes of the kink-tearing turbulence have clarified the self-consistent relations among the anomalous impedance, anomalous heation, and the self-organization phenomena which are key characteristics of the high current density plasmas.
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.

Report

(4 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • 1990 Annual Research Report
  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] N.Inoue and Y.Ogawa: "Ohmic Ignition of Neo-Alcator Tokamak with Adiabatic Compression" Kakuyugo-kenkyu. 67. 445-453 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [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
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Z.Yoshida and 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
    • Related Report
      1992 Final Research Report Summary
  • [Publications] N.Inoue and Y.Ogawa: "Ohmic Ignition of Neo-Alcator Tokamak with Adiabatic Compression" Kakuyugo-kenkyu. Vol.67. 445-453 (1992)

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

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [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
    • Related Report
      1992 Final Research Report Summary
  • [Publications] N. Inoue and Y. Ogawa: "Ohmic Ignition of Neo-Alcator Tokamak with Adiabatic Compression" Kakugo-kenkyu. 67. 445-453 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Z. Yoshida: "Anomalous Impedance and Amomalius Ion Heating Due to Gyrorelaxation through Magnetohydrodynamic Fluctuations" Physics of Fluids B. 4. 1534-1538 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Z. Yoshida and A. Hasegawa: "Transit-time Magnetic Pumping Induced by Spontaneous Fluctuations in a Magnetohydrodynamic Relaxation Process" Physics of Fluids B. 4. 3013-3015 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Z.Yosida: "Experimental Scaling of Anomalous Resistance in Ultra Low q Discharges" Nuclear Fusion. 31. 1531-1536 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Z.Yoshida: "Direct Ion Heating through MHD Relaxation" Nuclear Fusion. 31. 386-390 (1991)

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

    • Related Report
      1991 Annual Research Report
  • [Publications] Z.Yoshida: "Anomalous Impedance and Anomalous Ion Heating due to Gyrorelaxation through Magnetohydrodynamic Fluctuations" Physics of Fluids B: Plasma Physics. 4. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] Z.Yoshida: "Helicity Waves Propagating in Plasma" Journal of Plasma Physics. 45. 481-488 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Z.Yoshida: "Eigenfunction Expansions Associated with the Curl Derivatives in Cylindvical Geometries" Journal of Mathematical Physics. 31. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] Z.Yoshida,Y.Giga: "Remarks on Spectra of Operator Rot" Math.Z. 204. 235-245 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] N.Inoue: "Ohmic Ignition of Tokamak Plasma via UltraーLowーq Discharge Combined with Adiabatic Compression" J.Nucl.Sci.Tech.27. 996-1001 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Z.Yoshida,A.Hasegawa: "Enhanced Particle and Heat Transports Due to Helicity Transport" in Plasma Phys.Controlled Nucl.Fusion Res.1990(Proc.IAEA Conf.,Washington D.C.). (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] Z.Yoshida: "Direct Ion Heating in MHD Relaxation" Nucl.Fusion. 31. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 63. 58-70 (1990)

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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