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Clarification of fundamental processes in negative ion plasma

Research Project

Project/Area Number 14380215
Research Category

Grant-in-Aid for Scientific Research (B)

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

Principal Investigator

WADA Motoi  Doshisha University, Faculty of Engineering, Professor, 工学部, 教授 (30201263)

Co-Investigator(Kenkyū-buntansha) KASUYA Toshiro  Doshisha University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (50221875)
NISHIURA Masaki  National Institute for Fusion Science, Assistant Professor, 核融合科学研究所, 助手 (60360616)
笹尾 真実子  東北大学, 大学院・工学研究科, 教授 (00144171)
Project Period (FY) 2002 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥5,800,000 (Direct Cost: ¥5,800,000)
Fiscal Year 2004: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2003: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2002: ¥2,900,000 (Direct Cost: ¥2,900,000)
Keywordsnegative ion / plasma diagnostics / plasma-surface interaction / plasma spectroscopy / atomic molecular process / modeling / photodetachment / time of flight / 水素負イオン / 速度分布関数 / VUV分光 / PIC / 仕事関数 / プラズマ加熱 / ラングミュアプローブ / 飛行時間差法 / イオン源 / 原子・分子衝突 / イオン音波 / エネルギー分布関数 / 振動励起
Research Abstract

Formation and destruction processes of negative ions were studied to clarify the factors affected by plasma-surface interaction at the wall of a plasma source confining a negative ion plasma. Simple dependence of negative ion density upon surface characteristic parameter like work function or tungsten coverage rate was not found obvious, but the negative ion density and/or the VUV spectrum of the light emission from the plasma appeared to be dependent upon plasma volume parameters as well. Electron energy distribution functions, perturbation upon extracted negative hydrogen ion (H^-) current due to laser injection into the ion source extraction region, and transport of perturbed plasma by photodetachement were investigated to clarify the effect of neutral collisions. A precise measurement of electron energy distribution function revealed the high energy component occupied larger portion than the one in a simple Maxwell distribution function. This corresponds to more frequent formation of vibrationally excited hydrogen molecules in the plasma. The collision processes were found influential upon the transport of H^- in hydrogen plasma through two mechanisms. The first is the deceleration of plasma due to neutral collision damping, and the second is an enhanced transport of H^- toward the extraction hole, which is presumed caused by a combination with the local electric field. Velocity distribution functions of neutral hydrogen atoms and molecules were measured by mass separated time-of-flight analysis. When the velocity distribution functions of D_2 molecules were fitted to Maxwell distribution functions, the molecular translational temperature increased with the discharge power up to a critical one, and then decreased against further increase of the power. The above experimental observations should form a set of key components to be taken into account for modeling the atomic and molecular processes in a negative ion containing plasma.

Report

(4 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • Research Products

    (33 results)

All 2005 2004 2002 Other

All Journal Article (27 results) Publications (6 results)

  • [Journal Article] Grid Bias Effect upon the Negative Ion Density in a Tandem Plasma Source2005

    • Author(s)
      H.Takahashi, T.Kasuya, M.Wada
    • Journal Title

      Thin Solid Films

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Measurement of Velocity Distributions of Neutral Particles in a Plasma2005

    • Author(s)
      S.Nishigaito, T.Kasuya, M.Wada
    • Journal Title

      Thin Solid Films

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Effects of Filter Magnetic Field and Gas Pressure on Extraction Efficiency of a Volume-Type H- Ion Source2005

    • Author(s)
      Y.Matsumoto, M.Nishiura, K.Matsuoka, M.Sasao, M.Wada, H.Yamaoka
    • Journal Title

      Thin Solid Films

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Enhancement of Extracted H- Current by Streaming Neutral Gas Injection2005

    • Author(s)
      A.Mendenilla, T.Kasuya, M.Wada
    • Journal Title

      Thin Solid Films

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Atomic fraction of hydrogen plasma in a negative hydrogen ion source2004

    • Author(s)
      M.Wada, T.Kasuya, H.Takahashi, T.Takemoto
    • Journal Title

      Review of Scientific Instruments 75

      Pages: 1786-1788

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Transport velocity of direct current laser induced photodetached electrons in a H^- ion source2004

    • Author(s)
      H.Takahashi, T.Kasuya, M.Wada
    • Journal Title

      Review of Scientific Instruments 75

      Pages: 1780-1782

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Contribution of local H- density to extracted H- beam current in a cesium seeded hydrogen plasma2004

    • Author(s)
      Y.Matsumoto, M.Nishiura, K.Matsuoka, M.Sasao, M.Wada, H.Yamaoka
    • Journal Title

      Review of Scientific Instruments 75

      Pages: 1757-1759

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Contribution of wall material to the vibrational excitation and negative ion formation in hydrogen negative ion sources2004

    • Author(s)
      M.Bacal, A.A.Ivanov, Jr., M.Glass-Maujean, Y.Matsumoto, M.Nishiura, M.Sasao, M.Wada
    • Journal Title

      Review of Scientific Instruments 75

      Pages: 1699-1703

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Atomic fraction of hydrogen plasma in a negative hydrogen ion source2004

    • Author(s)
      M.Wada, T.Kasuya, H.Takahashi, T.Takemoto
    • Journal Title

      Review of Scientific.Instruments 75

      Pages: 1786-1786

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Transport velocity of direct current laser induced photodetached electrons in a H- ion source2004

    • Author(s)
      H.Takahashi, T.Kasuya, M.Wada
    • Journal Title

      Review of Scientific.Instruments 75

      Pages: 1780-1780

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Contribution of local H-density to extracted H-beam current in a cesium seeded hydrogen plasma2004

    • Author(s)
      Y.Matsumoto, M.Nishiura, K.Matsuoka, M.Sasao, M.Wada, H.Yamaoka
    • Journal Title

      Review of Scientific.Instruments 75

      Pages: 1757-1757

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Contribution of wall material to the vibrational excitation and negative ion formation in hydrogen negative ion sources2004

    • Author(s)
      M.Bacal, A.A.Ivanov, Jr., M.Glass-Maujean, Y.Matsumoto, M.Nishiura, M.Sasao, M.Wada
    • Journal Title

      Review of Scientific.Instruments 75

      Pages: 1699-1699

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Contribution of wall material to the vibrational excitation and negative ion formation in hydrogen negative ion sources2004

    • Author(s)
      M.Bacal, et al.(Last author)
    • Journal Title

      Review of Scientific Instruments 75

      Pages: 1699-1699

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Contribution of local H. density to extracted H. beam current in a cesium seeded hydrogen plasma2004

    • Author(s)
      Y.Matsumoto, M.Wada et al.
    • Journal Title

      Review of Scientific Instruments 75

      Pages: 1757-1757

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Transport velocity of direct current laser induced photodetached electrons2004

    • Author(s)
      H.Takahashi, T.Kasuya, M.Wada
    • Journal Title

      Review of Scientific Instruments 75

      Pages: 1780-1780

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Measurement of negative ion density in a plasma by DC laser photodetachment method2002

    • Author(s)
      H.Takahashi, T.Kasuya, M.Wada
    • Journal Title

      Proceedings of International Symposium on Dry Processes 2002

      Pages: 131-136

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Measurement of electron energy distribution function by a compact electrostatic deflection type energy analyzer2002

    • Author(s)
      R.Imai, A.Nakajo, H.Hiramatsu, T.Nishimori, T.Kasuya, M.Wada
    • Journal Title

      Proceedings of International Symposium on Dry Processes 2002

      Pages: 149-154

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Influence of wall material on VUV emission from hydrogen plasma in H^- source2002

    • Author(s)
      M.Bacal, M.Glass-Maujean, A.A.Ivanov, Jr.M.Nishiura, M.Sasao, M.Wada
    • Journal Title

      AIP Conference Proceedings 639

      Pages: 13-20

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Measurement of H- density and work function of a plasma electrode in a negative ion source2002

    • Author(s)
      M.Nishiura, M.Sasao, M.Wada
    • Journal Title

      AIP Conference Proceedings 639

      Pages: 21-27

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Measurement of negative ion density in a plasma by DC laser photodetachment method2002

    • Author(s)
      H.Takahashi, T.Kasuya, M.Wada
    • Journal Title

      Proceedings of International Symposium on Dry Processes 2002 (IEEJ) 131

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Measurement of electron energy distribution function by a compact electrostatic deflection type energy analyzer2002

    • Author(s)
      R.Imai, A.Nakajo, H.Hiramatsu, T.Nishimori, T.Kasuya, M.Wada
    • Journal Title

      Proceedings of International Symposium on Dry Processes 2002 (IEEJ) 149

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Influence of wall material on VUV emission from hydrogen plasma in H- source2002

    • Author(s)
      M.Bacal, M.Glass-Maujean, A.A.Ivanov, Jr.M.Nishiura, M.Sasao, M.Wada
    • Journal Title

      AIP Conf.Proc. 639

      Pages: 13-13

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Measurement of H-density and work function of a plasma electrode in a negative ion source2002

    • Author(s)
      M.Nishiura, M.Sasao, M.Wada
    • Journal Title

      AIP Conf.Proc. 639

      Pages: 21-21

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Grid Bias Effect upon the Negative Ion Density in a Tandem Plasma Source

    • Author(s)
      H.Takahashi, T.Kasuya, M.Wada
    • Journal Title

      Thin Solid Films (To appear)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Measurement of Velocity Distributions of Neutral Particles in a Plasma

    • Author(s)
      S.Nishigaito, T.Kasuya, M.Wada
    • Journal Title

      Thin Solid Films (To appear)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Effects of Filter Magnetic Field and Gas Pressure on Extraction Efficiency of a Volume-Type H- Ion Source

    • Author(s)
      Y.Matsumoto, M.Nishiura, K.Matsuoka, M.Sasao, M.Wada, H.Yamaoka
    • Journal Title

      Thin Solid Films (To appear)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Enhancement of Extracted H- Current by Streaming Neutral Gas Injection

    • Author(s)
      A.Mendenilla, T.Kasuya, M.Wada
    • Journal Title

      Thin Solid Films (To appear)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] H.Takahashi, T.Kasuya, M.Wada: "Transport velocity of dc laser induced photodetached electrons in a H-ion source"Review of Scientific Instruments. Vol.75,5. (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Wada, H.Takahashi, T.Takemoto, T.Kasuya: "Atomic fraction of hydrogen plasma in a negative hydrogen ion source"Review of Scientific Instruments. Vol.75,5. (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Y.Matsumoto, M.Nishiura, M.Wada et al.: "Contribution of H- density near a plasma grid surface in an H- beam extracted from a Cs added volume production type ion source"Review of Scientific Instruments. Vol.75,5. (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Bacal, M.Nishiura, M.Wada et al.: "Contribution of wall material to the vibrational excitation and negative ion formation in hydrogen negative ion sources"Review of Scientific Instruments. Vol.75,5. (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] H.Takahashi, T.Kasuya, M.Wada: "Measurement of Negative Ion Density in a Plasma by DC Laser Photodetachment Method"Proceedings of International Symposium on Dry Process. DPS2002. 131-136 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] R.Imai, A.Nakajo, H.Hiramatsu, T.Nisimori, T.Kasuya, M.Wada: "Measurement of Electron Energy Distribution Function by a Compact Electrostatic Deflection Type Energy Analyzer"Proceedings of International Symposium on Dry Process. DPS2002. 149-154 (2002)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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