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Study for Intense Neutrl Helium Bean

Research Project

Project/Area Number 10480110
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Nuclear fusion studies
Research InstitutionNatiomal Institute for Fusion Science

Principal Investigator

SASAO Mamiko  Natiomal Institute for Fusion Science, Div.of Large Helical Device, Asso.Prof, 大型ヘリカル研究部, 助教授 (00144171)

Co-Investigator(Kenkyū-buntansha) ISOBE Mitsutaka  Nat.Ins.for fusion sci,Div.of Large Helical Device,Res.Asso, 大型ヘリカル研究部, 助手 (00300731)
TAKEIRI Yasuhiko  Nat.Ins.for fusion sci,Div.of Large Helical Device,Asso.Prof, 大型ヘリカル研究部, 助教授 (60179603)
WADA Motoi  doshisha University,Faculty of Eng,Prof, 工学部, 教授 (30201263)
SHINTO Katsuhiro  Tohoku University,Faculty of Sci,Res.Asso, 大学院・理学研究科, 助手 (80322999)
大塚 道夫  日立製作所, 核融合実験炉建設センター, センター長
Project Period (FY) 1998 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥11,700,000 (Direct Cost: ¥11,700,000)
Fiscal Year 2001: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2000: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1999: ¥4,900,000 (Direct Cost: ¥4,900,000)
Fiscal Year 1998: ¥4,500,000 (Direct Cost: ¥4,500,000)
Keywordshelium negative ion / metastabe helium atom / low work function surface / alpha particle diiagnostics / nuclear fusion / hurning experiment / アルファ粒子
Research Abstract

Diagnostics of fusion-produced-alphas is an important task for a burning plasma experiment. One possible way to obtain the velocity distribution of confined alphas is combination of neutral-particle-analysis with injection of a neutral He beam at the energy of 0.8 MeV/nucleon. To realize this diagnostic method, development of an intense beam source (≧1mA/cm2) of He is important. A compact bucket-type He+ source was developed and a 77 μA dc He" beam was obtained at 11 keV using a Rb double-charge-exchange cell with conversion efficiency better than 3 %. This type of source was further developed by optimizing the extraction system and by operating in the higher discharge power region. A beam more than 20mA/cm2 was extracted from a 0.6 cm-diameter hole at 11 keV. This record provides a promising beam system for alpha particle diagnostics. The electron capture process of He+ into one-electron excited states of a He atom has been studied in prospect of subsequent He" formation. The spectroscopic measurement in a Rb charge exchange cell was performed when a low energy He+ beam of 2 - 10 keV was injected. The ratio of emission lines decaying into triplet states to those into singlet is increased as the impact energy of He+ increases. The results are compared with theoretical calculation using Smirnov method. Searching for a better way to produce He" with less amount of alkali metal consumption, we tested if He" production was possible from a low work function metal surface by injecting a metastable-He neutral beam. The experiment showed that the low work function surface becomes unstable mostly by bombardment of incoming energetic neutrals. Further study is needed to realize an applicable He" beam.The compact bucket source developed here became a reference design for the industrial use.

Report

(5 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • Research Products

    (22 results)

All Other

All Publications (22 results)

  • [Publications] M.Wada, M.Sasao, M.Nishiura, H.Yamaoka, M.Matsumoto, et al.: "Angle resolved energy distributions of He ions produced by back scattering of meta-stable He at low workfunction metal surface"Review of Scientific Instruments. 73-2. 955-957 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M.Nishiura*, M.Sasao, M.Matsumoto, M.Hamabe, et al.: "Influence of filament materials on vacuum ultraviolet emissions in H^-ion source"Review of Scientific Instruments. 73-2. 949-951 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M.Nishiura*, M.Sasao, M.Matsumoto, M.Hamabe, et al.: "Cooling effect of hydrogen negative ions in argon gas mixture"Review of Scientific Instruments. 73-2. 973-975 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M.Nishiura, M.Sasao, M.Wada, M.Bacal: "Plasma perturbation induced by laser photodetachment"Physical Review E. 63. 036408(7) (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M.Sasao, M.Nishiura, M.Hamabe, M.Isobe, M.Osakabe, et al.: "Development of diagnostic helium beams for high energy particle measurement in magnetically confined plasma"Proceedings of the 27th European Physical Society Conference on Controlled Fusion and Plasma Physics (June 2000, Budapest). 456-459 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M.Nishiura, M.Sasao, M.Wada, M.Hamabe, T.Kuroda, et al.: "Development of a compact multicusp ion source of He^+"Review of Scientific Instruments. 71. 1171-1173 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M. Wada, M. Sasao, M. Nishiura, H. Yamaoka, et. al.: "Angle resolved energy distributions of He ions produced by back scattering of meta-stable He at low work function metal surface,"Review of Scientific Instruments. Vol.73. 955-957 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M. Nishiura*, M. Sasao, M. Matsumoto, M. Hamabe, et al.: "Influence of filament materials on vacuum ultraviolet emissions in H. ion source"Review of Scientific Instruments. Vol.73. 949-951 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M. Nishiura*, M. Sasao, M. Matsumoto, et al.: "Cooling effect of hydrogen negative ions in argon gas mixture"Review of Scientific Instruments. Vol.73. 973-975 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M. Nishiura, M. Sasao, M. Wada, and M. Bacal: "Plasma perturbation induced by laser photodetacnment"Physical Review E,. Vol.63. 036408(7p) (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M. Sasao, M. Nishiura, M. Hamabe, M.Isobe, M. Osakabe, et al: "Development of diagnostic helium beams for high energy particle measurement in magnetically confined plasma"Proceedings of the 27th European Physical Society Conference on Controlled Fusion and Plasma Physics (June 2000, Budapest). 456-459

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M. Nishiuia, M. Sasao, M. Wada, M. Hamabe, T. Kuroda, et al.: "Development of a compact multicusp ion source of He+"Review of Scientific Instruments. Vol.71. 1171-1173 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M.Wada, M.Sasao, M.Nishiura, H.Yamaoka, M.Matsumoto, et al.: "Angle resolved energy distributions of He ions produced by back scattering of meta-stable He at low work function metal surface"Review of Scientific Instruments. 73-2. 955-957 (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] M.Nishiura^*, M.Sasao, M.Matsumoto, M.Hamabe, et al.: "Influence of filament materials on vacuum ultraviolet emissions in H^-ion source"Review of Scientific Instruments. 73-2. 949-951 (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] M.Nishiura^*, M.Sasao, M.Matsumoto, M.Hamabe, et al.: "Cooling effect of hydrogen negative ions in argon gas mixture"Review of Scientific Instruments. 73-2. 973-975 (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] M.Sasao, A.V.Krasilnikov, M.Isobe, T.Seki, K.Saito, T.Saida, et al.: "MEASUREMENT OF HIGH ENERGY PROTON TEMPERATURE IN LHD"Accepted for publication in Diagnostics for Exp. Th. Fusion Reactors. Vol 3.. (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] M.Nishiura,M.Sasao,M.Wada,and M.Bacal,: ""Plasma perturbation induced by laser photodetachment."Physical Review E.. Vol.63. 036408-(7) (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] M.Sasao,M.Nishiura,M.Hamabe,M.Isobe,M.Osakabe,S.K.Guharay,T.Kuroda,M.Wada: "Development of diagnostic helium beams for high energy particle measurement in magnetically confined plasma"Proceedings of 27th European Physical Society Conference on Controlled Fusion and Plasma Physics (June 2000, Budapest). (未定). (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] M.Sasao,M.Nishiura,M.Hamabe,M.Wada,T.Kuroda,S.K.Guharay,and H.J.Ramos: "Space Charge Effect on the Transport of a High-Perveance He^+ Beam"Proceedings of 18th SPP Congress. 101-103 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] M. Nishimura, M. Sasao, et al.: "Development of a compact multicusp ion source of He^+"Review of Scientific Instruments. 71. 1063-1065 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] M. Sasao et al.: "Electron Capture Processes in Rb for He^- Formation"Proceedings of the ISAPP (NIFS-PROC). 44. 192-193 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] M. Nishimura, M. Sasao, et al.: "Characteristics of an He^+ beam extracted from a compact multicusp ion source"Proceedings of the 17th National Physics Congres. 191-193 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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