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Negative Ion Plasmas

Research Project

Project/Area Number 63460219
Research Category

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

Allocation TypeSingle-year Grants
Research Field プラズマ理工学
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

SATO Noriyoshi  Tohoku University, Faculty of Engineering, Professor, 工学部, 教授 (40005252)

Co-Investigator(Kenkyū-buntansha) ISHIGURO Seiji  Tohoku University, Faculty of Engineering, Research Associate, 工学部, 助手 (10193301)
TSUSHIMA Akira  Tohoku University, Faculty of Engineering, Research Associate, 工学部, 助手 (90171991)
IIZUKA Satoru  Tohoku University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (20151227)
HATAKEYAMA Rikizo  Tohoku University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (00108474)
Project Period (FY) 1988 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥7,500,000 (Direct Cost: ¥7,500,000)
Fiscal Year 1989: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1988: ¥6,300,000 (Direct Cost: ¥6,300,000)
KeywordsNegative ion Plasmas / Plasma Physics / 負イオン / プラズマ / 物性
Research Abstract

Negative ion plasmas have new features in plasma physics and its applications, which are to be investigated from both theoretical and experimental points of view. Here our recent experiments on negative ion plasmas are presented, including a brief review of the previous experiments. In our experiments, negative ion plasmas are produced by introducing a small amount of SF6 gas into a single-ended Q-machine plasma. The density ratio of negative (SF_6^-) to positive (K^+) ions, n_-/n_+, is controlled continuously in the range up to 0.9999. Our main interests are in effects of an existence of negative ions on characteristics of typical plasma waves and instabilities, i.e., electron plasma waves, ion waves, electrostatic ion cyclotron wave instability, and drift wave instability in negative ion plasmas. Their properties observed are consistent with theoretical predictions. It is also shown that some of these waves and instabilities are quite useful in determining the ratio n_-/n_+, especially in case of (n_+-n_-/n_+<< 1.

Report

(3 results)
  • 1989 Annual Research Report   Final Research Report Summary
  • 1988 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] N.Sato: "Negative Ion Plasmas" Proc.of 1989 International Conf.on Plasma Phys.,New Delhi(Invited),(to be pulbished).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] N.Sato: "Potential Formation in a HighーSpeed Plasma Flow along converging Hagnetic Field Sines" Peuysical Review Letters. 61. 1615-1618 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] N. Sato: "Negative Ion Plasmas" Proc. of 1989 Intern. Conf. on Plasma Physics, New Delhi (Invited Papers).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] N. Sato, Y. Watanabe, R. Hatakeyama, and T. Mieno: "Potential Formation in a High-Speed Plasma Flow along Converging Magnetic Field Lines" Physical Review Letters, Vol.61, No.14, 1615-1618, 1988.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] N.Sato: "Potential Formation in a High-Speed Plasma Flow along converging Magnetic Field Sines" Physical Reviero Setters. 61. 1615-1618 (1988)

    • Related Report
      1989 Annual Research Report
  • [Publications] N.Sato: "Negative Ion Plasma" Proc.of 1989 International Conf.on Plasma Phys.,New Delhi(Invited).

    • Related Report
      1989 Annual Research Report
  • [Publications] T.Mieno: Journal of the Physical Society of Japan. 57. 2717-2724 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] N.Sato: Physical Review Letters. 61. 1615-1618 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] K.Nishimura: Review of Suentific Instruments. 59. 2169-2173 (1988)

    • Related Report
      1988 Annual Research Report

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Published: 1988-04-01   Modified: 2016-04-21  

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