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Research on collapse of double layers and turbulent-heating phenomena

Research Project

Project/Area Number 60420050
Research Category

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

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

Principal Investigator

TSUKISHIMA Takashige  Nagoya University, 工学部, 教授 (20023020)

Co-Investigator(Kenkyū-buntansha) INUZUKA Hiroshi  Nagoya University, 工学部, 助手 (80176411)
NAGATSU Masaaki  Nagoya University, 工学部, 講師 (20155948)
Project Period (FY) 1985 – 1988
Project Status Completed (Fiscal Year 1988)
Budget Amount *help
¥19,100,000 (Direct Cost: ¥19,100,000)
Fiscal Year 1988: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1987: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1986: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1985: ¥13,600,000 (Direct Cost: ¥13,600,000)
KeywordsDouble Layer / Turbulent Heating / Mirror Machine / Laser Scattering / Plasma Heating / Electron Hole / Computer Simulation / Plasma Transport / オーロラ / プラズマ / 壁相互作用 / 不純物放射 / マイクロ波干渉法
Research Abstract

1. Temporal evolution of electron temperature T. was measured during the period from formation to collapse of double layers (DL) produced in a linear turbulent-heating device, by making use of Ruby laser Thomson scattering. An electron hole was observed berofe the formation of DL. An increase in T. was also observed concomitant with decay of the electron hole,which, in turn, resulted in excitation of ion acoustic waves leading to formation of DL.
2. Parameters which may have effect on the life time of DL were examined. It was found that the life time of DL depends strongly on the distance between two electrodes and partial pressure of neutral particles but less on materials used and size of the wall.
3. Computer simulation were carried out with boundary conditions close to the experimental ones. Qualitatively good agreement was obtained between experimental and simulation results for the formation process of DLs.
4. Based on the experimental and simulation results decribed above, a theortical model was proposed to understand physical process leading to collapse of DL in the linear turbulent=heating device. The model takes into account the inbalance of plasma densities in the anode and cathode sides seen from the DL, which may be brought forth by "the ion transport" through the DL. The pressure inbalance so produced pushes the DL toward the anode. Then the DL vanishes when it reaches the anode.
5. Additional experiments and simulations were carried out under the condition appropriate to verify the proposed model, and reasonable results were obtained.
6. The physical picture obtained in the present research as to the collapse of DL is related to change in internal structure of DL, as opposed to conventional mechanism due to external cicuit, and may be applied to other DLs such as those in aurora.

Report

(5 results)
  • 1988 Annual Research Report   Final Research Report Summary
  • 1987 Annual Research Report
  • 1986 Annual Research Report
  • 1985 Annual Research Report
  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] 犬塚博: Phys.Fluids. vol.28. 2106-2115 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 犬塚博: Phys.Fluids. vol.30. 3294-3297 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 犬塚博: Physica Scripta. vol.37. 542-545 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 築島隆繁: 核融合研究. 第60巻. 121-137 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Hiroshi,Inuzuka; Yutaka,Torii; Takashige,Tsukishima: "Numerical simulations of current-limited double layers observed in a linear mirror device" Physics of Fluids. 28. 2106-2115 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Hiroshi,Inuzuka; Yutaka,Torii; Masaaki,Nagatsu; Takashige,Tsukishima: "Spontaneous collapse of double layers in a simple mirror confimement device" Physics of Fluids. 30. 3294-3297 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Hiroshi,Inuzuka; Akihiro,Suzuki; Masaaki,Nagatsu; Takashige,Tsukishima: "Direct observation of a strong electron hole in a linear turbulent heating device" Physica Scripta. 37. 542-545 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Takashige,Tsukishima; Hiroshi,Inuzuka: "Development of non-linear phenomena in a linear turbulently heated plasma (observations of electron hole, double layer, and turbulent heating)" Nuclear Fusion Research. 60. 121-137 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 築島隆繁: 核融合研究. 第60. 121-137 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 犬塚 博: Physics of Fluids. VOL.30. 3294-3297 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] 犬塚 博: Physica Scripta. (1988)

    • Related Report
      1987 Annual Research Report
  • [Publications] 築島隆繁: Review of Scientific Instruments. vol.57. 560-565 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] 永津雅章: Japanese Journal of Applied physics. vol.25. 175-178 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] 犬塚博: Physics of Fluids.

    • Related Report
      1986 Annual Research Report
  • [Publications] 孫克しゅん: Japanese Journal of Applied Physics. vol.25. 1886-1889 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] 永津雅章: Nuclear Fusion. (1987)

    • Related Report
      1986 Annual Research Report
  • [Publications] Phys.Fluids. 28-2. (1985)

    • Related Report
      1985 Annual Research Report
  • [Publications] Phys.Fluids. 28-7. (1985)

    • Related Report
      1985 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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