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Study on a Current Channel Shrinkage and a Heating Enhancement Due to a Maqnetic Compressionof ULQ Plasmas

Research Project

Project/Area Number 04402049
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

OGAWA Yuichi  University of Tokyo, Dept.of Quantum Engineering and Systems Science, Associate Professor, 工学部, 助教授 (90144170)

Co-Investigator(Kenkyū-buntansha) SHINOHARA Shunjiro  University of Kyushu, Interdisciplinary Graduate School of Engineering Sciences,, 大学院・総合理工学研究科, 助教授 (10134446)
TOYAMA Hiroshi  University of Tokyo, Dept.of Physics, Professor, 理学部, 教授 (50023718)
MORIKAWA Junji  University of Tokyo, Dept.of Quantum Engineering and Systems Science, Technical, 工学部, 教務職員 (70192375)
YOSHIDA Zensho  University of Tokyo, Dept.of Quantum Engineering and Systems Science, Associate, 工学部, 助教授 (80182765)
INOUE Nobuyuki  University of Tokyo, Dept.of Quantum Engineering and Systems Science, Professor, 工学部, 教授 (60023719)
二瓶 仁  東京大学, 工学部, 助手 (70010973)
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥34,000,000 (Direct Cost: ¥34,000,000)
Fiscal Year 1993: ¥6,700,000 (Direct Cost: ¥6,700,000)
Fiscal Year 1992: ¥27,300,000 (Direct Cost: ¥27,300,000)
KeywordsPlasma / Nuclear Fusion / ULQ / VLQ / Magnetic compression / Magnetic fluctuations / H_<alpha> signal / Ion anomalous heating / Dynamo electric field / H_αシグナル / 異常加熱 / MHD緩和 / 不純物輸送 / プラズマ・壁相互作用
Research Abstract

The magnetic compresseion has been applied for a Ultra-low-q (ULQ) plasma with a safety factor q (a) of less than unity, where the toroidal magetic field B_t was increased from 0.1 T to 0.3 T.During the magnetic compression phase, the increases of the loop voltage and magnetic fluctuations have been observed, indicating the enhancement of the resistance anomaly. This might be accounted for a poloidal electric field induced by the rapid increase of the toroidal magnetic field, the direction of which is opposite to the incident dynamo electric field. H_<alpha> signals have drastically suppressed during the magnetic compression, accompanied by the shrinkage of the plasma column with a few centimenter.
Just after the magnetic compression the plasma current begins to increase, and the loop voltage and magentic fluctuations are kept at low levels during this phase. Compared with the scaling of resistance anomaly for ULQ plasmas, the plasma resistance of this phase is quite low, and more stable and quiescent ULQ plasmas have been realized by applying the magnetic compression for ULQ plasmas. This stable ULQ configuration terminates when the rational surface appears at the plasma surface, accompanied by the increase of magnetic fluctuations and the anomalous ion heating. It is found that the magnetic compression is very powerful to introduce an externally-induced poloidal electric field and to understand the role of the dynamo electric field in ULQ plasmas.

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (19 results)

All Other

All Publications (19 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
      1993 Final Research Report Summary
  • [Publications] Z.Yoshida: "Anomalous Impedance and Anomalous Ion Heating Due to Gyrorelaxation through Magnetohydrodynamic Fluctuations" Physics of Fluid B. 4. 1534-1538 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 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 Fluid B. 4. 3013-3015 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] S.Shinohara,S.Ohadaci et al.: "Movable Limiter Insertion and First Pump Limiter Experiments in a Reversed-Field Pinch" Physics of Fluid B. 5. 464-470 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Z.Yoshida: "Self-Organization and Anomalous Heating in Plasmas" Butsuri. 48. 73-78 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Z.Yoshida: "A Remark on the Hamiltonian Form of the Magnetic-Field Line Equations" Physics of Plasmas. 1. 208-209 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 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
      1993 Final Research Report Summary
  • [Publications] Z.Yoshida: "Anomalous Impedance and Anomalous Ion Heating Due to GHyrorelaxation through Magneohydrodynamic Fluctuations" Physics of Fluid B. Vol.4. 1534-1538 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Z.Yoshida and A.Hasegawa: "Transit-Time Magnetic Pumping Induced by Spontaneous Fluctuations ina 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
      1993 Final Research Report Summary
  • [Publications] S.Shinohara, S.Ohdachi, H.Toyama, K.Miyamoto, T.Banno: "Movable Limiter Insertion and First Pump Limiter Experiments in a Reversed-Field Pinch" Physics of Fluid B. Vol.5. 464-470 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Z.Yoshida: "Self-Organization and Anomalous Heating in Plasmas" Butsuri. Vol.48. 73-78 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Z.Yoshida: "A Remark on the Hamiltonian From of the Magnetic-Field-Line Equations" Physics of Plasmas. Vol.1. 208-209 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Z.Yoshida: "A Remark on the Hamiltonian Form of the Magnetic-Field-Line Eouations" Physics of Plasmas. 1. 208-209 (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] S.Shinohara,S.Ohdachi et al.: "Movable Limiter Insertion and First Pump Limiter Experiments in a Reversed-Field Pinch" Physics of Fluid B. 5. 464-470 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] H.Toyama,H.Ji,A.Ejiri et al.: "Fluctuation Induced Transport and Anomalous Heating in RFP,ULQ and ULQ Plasmas" Plasma Physics and Controlled Nuclear Fusion Research. 12. 547-552 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Z.Yoshida: "Self-Organization and Anomalous Heating in Plasmas" Butsuri. 48. 73-78 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] N.Inoue and Y.Ogawa: "Ohmic Ignition of Neo-Alcator Tokamak with Adiabatic Compression" Kakuyugo-Kenkty. 67. 445-453 (1992)

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

    • Related Report
      1992 Annual Research Report
  • [Publications] Z.Yshida and A.Hasegawa: "Transit-time Magnetic Pumping Induced by Spontaneous Fluctumatuons in a Magnetohynamic Relazation Process" Phtsics of Fluids B. 4. 3013-3015 (1992)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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