Fe14+ and Fe15+ Spatial Distributions in a LHD Plasma Reconstructed from Multiple-Viewing-Chord EUV-Emission Observation

DOI Web Site 2 Citations 7 References
  • YANAGIBAYASHI Jun
    Department of Mechanical Engineering and Science, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan
  • GOTO Motoshi
    National Institute for Fusion Science, Toki 509-5292, Japan
  • DONG Chunfeng
    National Institute for Fusion Science, Toki 509-5292, Japan
  • MORITA Shigeru
    National Institute for Fusion Science, Toki 509-5292, Japan
  • HASUO Masahiro
    Department of Mechanical Engineering and Science, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan

Abstract

We have observed Fe14+ (3s2 1S0 - 3s3p 1P1) and Fe15+ (3s 2S1/2 - 3p 2P3/2) emissions from a LHD plasma with a space-resolved extreme-ultraviolet spectrometer. The observed intensity distributions against the viewing chord for the respective emissions are reconstructed to the emission flux distributions in the plasma against the normalized radius of the poloidal cross section with a maximum entropy method. Both of the emissions localize in the periphery region, and the Fe14+ emission is located outer side than that of Fe15+. We calculate the charge state distribution of Fe ions against the normalized radius assuming the ionization equilibrium at the electron temperature and density, which are measured by a Thomson scattering method. The calculated result is consistent with the experimental one.

Journal

  • Plasma and Fusion Research

    Plasma and Fusion Research 6 2402060-2402060, 2011

    The Japan Society of Plasma Science and Nuclear Fusion Research

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