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Nonlinear Waves in a Finite Plasma

Research Project

Project/Area Number 63580013
Research Category

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

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

Principal Investigator

KAWAI Yoshinobu  Kyushu University, Interdisciplinary Graduate School of Engineering Sciences, Professor, 大学院・総合理工学研究科, 教授 (10038565)

Co-Investigator(Kenkyū-buntansha) WATANABE Shinsuke  Yokohama National University, Faculty of Engineering, Professor, 工学部, 教授 (60017936)
TANAKA Masayoshi  Kyushu University, Interdisciplinary Graduate School of Engineering Sciences, Re, 大学院・総合理工学研究所, 助手 (90163576)
Project Period (FY) 1988 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1990: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1989: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1988: ¥700,000 (Direct Cost: ¥700,000)
KeywordsFinite Plasma / Ion Acoustic Wave / Reflection Coefficient / Double Plasma / Ion-Ion Instability / Electron Beam-Plasma System / Beam Mode / Subharmonics / イオン波の反射 / イオン・イオン不安定性 / ポンプ波 / ビ-ム・ラングミュアモ-ド / 定常シ-ス / ソリトン / イオンシース
Research Abstract

We have studied both theoretically and experimentally nonlinear phenomena in a finite plasma without magnetic fields, and the following results are obtained.
1. We examined the characteristics of the ion acoustic wave reflected by the boundary. The main results are as follows :
(i) The particles trapped in the sheath formed around a negatively biased grid play an important role in the wave reflection.
(ii) When an ion acoustic solution propagates into the sheath, the reflected wave becomes a solution for the large amplitude, and an ion acoustic wave for the small amplitude, respectively.
(iii) The experiments on the reflection of ion waves are carried out using the DP machine. It is found that ions play an important role in the reflection, and the reflection coefficient does not depend on the frequency for the beam modes and it is decreasing function of frequency for the ion acousti wave.
2. We attempted the suppression of the ion-ion instability by an external field and found that the threshold value at which the instability is suppressed depends on the frequency of the external field.
3. We observed the mode transition of the electron beam-plasma instability : from the beam mode to the beam Langmuir mode.
4. We succeeded in the excitation of the subharmonics of the beam mode. The subharmonics may be excited by period doubling.
These results will contribute to the development of nonlinear phenomena in plasmas.

Report

(4 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • 1988 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] Takashi SATO: "SeHーFocusimg of Iom wave in plasma with Negative Ion" J.Phys.Soc.Jpn.59. 159-165 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Yoshifumi SAITO: "Suppression of IonーIon Imstabilities by an External Field" J.Phys.Soc.Jpn.59. 3793-3794 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Toshirou KASUYA: "Observations of Subharmonic Waves in an Electron Beam Plasma System" J.Phys.Soc.Jpn.59. 3931-3936 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Takashi Sato, Singo Ishiwata, Shinsuke Watanabe, Hiroshi Tanaca and Haruichi Washimi: "Self-Focusing of Ion Wave in Plasma with Negative Ion" J. Phys. Soc. Jpn.59. 159-165 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Yoshifumi Saitou, Masayoshi Tanaka, Akio Komori and Yoshinobu Kawai: "Suppression of Ion-Ion Instabilities by an External Field" J. Phys. Soc. Jpn.59. 3793-3794 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Toshirou kasuya, Masayoshi Tanaka, Akio Komori and Yoshinobu Kawai: "Observations of Subharmonic Waves in an Electron Beam Plasma System" J. Phys. Soc. Jpn.59. 3931-3936 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Takashi SATO: "SelfーFocusing of Ion Wave in Plasma with Negative Ion" J.Phys.Soc.Jpn.59. 159-165 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Yoshifumi SAITO: "Suppression of IonーIon Instabilities by an External Field" J.Phys.Soc.Jpn.59. 3793-3794 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Toshirou KASUYA: "Observations of Subharmonic Waves in an Electron Beam Plasma System" J.Phys.Soc.Jpn.59. 3931-3936 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Shunichi NODA.: Jpn.J.AppI.Phys.27. 1562-1563 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] Shunichi NODA.: Jpn.J.Appl.Phys.27. 2421-2422 (1988)

    • Related Report
      1988 Annual Research Report

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

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