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Study of the strong electrostatic fields leaved after an interaction between an intense electron beam and plasma

Research Project

Project/Area Number 11680479
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field プラズマ理工学
Research InstitutionKanazawa University

Principal Investigator

ANDO Ritoku  Kanazawa University, Faculty of Science, Associate Professor, 理学部, 助教授 (80212679)

Co-Investigator(Kenkyū-buntansha) KAMADA Kei-ichi  Kanazawa University, Faculty of Science, Associate Professor, 理学部, 助教授 (90143875)
増崎 克  金沢大学, 理学部, 教授 (10110602)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2000: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1999: ¥1,800,000 (Direct Cost: ¥1,800,000)
KeywordsLangmuir wave / strong Langmuir turbulence / caviton / electron beam probing technique / electron beam shadowgraph / deflection pattern / boiling structure / intense relativistic electron beam (IREB) / ラングミュア乱流 / 微細構造 / 電子ビームプローブ / 大強度相対論的電子ビーム / IREB / 自己組織化 / パルス生成プラズマ / 非線形相互作用 / 航跡場
Research Abstract

Langmuir wave becomes unstable at the large amplitude, and possibly produces a number of localized wave packets of Langmuir wave, which is called a caviton. The nonlinear properties are investigated strongly in the theory of the strong Langmuir turbulent. Generally, measurements of the electric field is difficult, and the 3-dimensional structure of the caviton which is predicted from the theory is not revealed well. The purpose of this research is to study such turbulence field using electron-beam probing-technique. The diagnosis is well known as a method to measure un-known electric field from deflection of the trajectory of a probing beam. Usually a well-focused parallel beam is used for this purpose, and we employed this type of beam for previous experiments. Our study showed difficulties of the method, because the observed deflections could not be attributed only to the caviton fields but other mechanisms. Large ambiguities were left there.
At first, the technical problems, that deg … More rade the quality of the data, are solved. It makes possible to detect a probing beam that has much lower density, and raise the reliability of the measurement, and give another possibility. Second, a shadowgraph technique using an electron beam is tried. This is first report to apply the technique for diagnostic. An employment of a large diameter probing-beam makes it possible to detect the special distribution of the deflection. Many bubbles were found in the beam pattern images. It is apparent that a sophisticated field, which is like the one expected from the turbulent theory, exists in our plasma. The averaged size of babbles is change by the plasma density and is estimated about 20 times of the Debye-length in the experiment. On the other side, a theoretical investigation pointed out the fact that the deflection angle becomes prominent only when the cavitons are at final stage of the collapse. It is possible to explain why the small babbles are observed in the experiment, though the turbulent theory says the population of the caviton with larger size is expected to be higher. Less

Report

(3 results)
  • 2001 Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] R.Ando, M.Masuzaki, et al.: "Electron Beam Probeing of Strong Langmuir Fields in an Intense Beam-Plasma System"IEEE Trans. Plasma Sci.. vol.27No.5. 1545-1547 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] R.Ando, H.Fujii, et al.: "Measurement of IREB-driven strong Langmuir field using electron beam probing technique"Proc. 13th Int. Conf. High-Power Particles Beams. 893-896 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] R.Ando, H.Fujii, et al.: "Measurment of spatial distribution of the nonlinear collasping wave packets by an electron beam shadowgraph"[超高エネルギー密度プラズマ物性と計測研究会」報告書. Research Report NIFS-PROC-50. 163-172 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 安藤利得, 藤井久司, 他: "ラングミュア乱流電場の空間分布の検証のための電子ビーム・シャドーグラフによる観測"電気学会パルスパワー研究会報告書. 論文資料番号PPT-01-65. 19-24 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] R. Ando, M. Masuzaki, et: "Electron Beam Probeing of Strong Langmuir Fields in an Intense Beam-Plasma System"IEEE Trans. Plasma Sci.. Vol.27, No. 5. 1545-1547 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] R. Ando, M. Masuzaki, et. Al: "Measurement of IREB-driven strong Langmuir field using electron beam probing technique"Proc. 13th Int. Conf. High-Power Particles Beams. 893-896 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] R. Ando, H. Fujii, et. Al.: "Measurment of spatial distribution of the nonlinear collapsing wave packets by an electron beam shadowgraph"Research Report NIFS-PROC-50. 163-172 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] R.Ando,M.Masuzaki, et.al.: "Electron Beam Probeing of Strong Langmuir Fields in an Intense Beam-Plasma System"IEEE Trans.Plasma Sci.. vol.27 No.5. 1545-1547 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] R.Ando,M.Masuzaki, et.al.: "Measurement of IREB-driven strong Langmuir field using electron beam probing techinique."Proc.13th Int.Conf.High-Power Particles Beams 2000. (to be published).

    • Related Report
      2000 Annual Research Report
  • [Publications] R.Ando, M.Masuzaki, et al.: "Electron Beam Probeing of Strong Langmuir Fields in an Intense Beam-Plasma System"IEEE Trans. Plasma Sci.. vol.27・No.5. 1545-1547 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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