Enhancement in the lonization Cross-Section of a 350 keV Hydrogen Beam on JT-60U Plasmas

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Abstract

Enhancement of the effective ionization cross-section has been investigated by shine-through measurements of a 350 keV hydrogen neutral beam on the JT-60U tokamak. The beam was injected into hydrogen plasmas with an electron density range of (1.0-4.1)×l0^19 m^-3 and an effective ionic charge of 1.3-2.2. Except for the low density region near 1×10^19 m^-3, the experimental shine-through (fraction of beam power not absorbed by the plasma) was remarkably smaller than predictions based on single-step ionization processes, suggesting that the effective ionization cross-section of the neutral beam was enhanced by multi-step ionization. The enhancement factor of the cross-section increased with electron density up to a maximum of 80%. It was shown that the experimental enhancement agreed with the theoretical predictions of Janev et al. [6] .

Journal

  • Journal of plasma and fusion research

    Journal of plasma and fusion research 73(12), 1374-1377, 1997-12-25

    プラズマ・核融合学会

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Codes

  • NII Article ID (NAID)
    110003826823
  • NII NACSIS-CAT ID (NCID)
    AN10401672
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    09187928
  • NDL Article ID
    4378164
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z15-8
  • Data Source
    CJP  CJPref  NDL  NII-ELS  NDL-Digital 
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