Collisional-Radiative Model for Spectroscopic Diagnostic of Optically Thick Helium Plasma

DOI Web Site 8 Citations 10 References
  • SAWADA Keiji
    Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan
  • YAMADA Yusuke
    Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan
  • MIYACHIKA Takamasa
    Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan
  • EZUMI Naomichi
    Nagano National College of Technology, 716 Tokuma, Nagano 381-8550, Japan
  • IWAMAE Atsushi
    Japan Atomic Energy Agency, 801-1 Mukoyama, Naka, Ibaraki 311-0193, Japan
  • GOTO Motoshi
    National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan

Abstract

We have included the effect of radiation trapping in a collisional-radiative model of neutral helium atoms developed by Goto [M. Goto, JQSRT 76, 331 (2003)], which is used to determine the electron temperature and density in plasmas from visible emission line intensities of atoms. In addition to the electron temperature and density, photo-excitation events from the ground state 11S to the 21P, 31P, and 41P states per second per one atom are treated as fitting parameters to reproduce the population density obtained by spectroscopic measurement. The model has been applied to an RF plasma at Shinshu University, Japan. The electron temperature and density and the contribution of radiation trapping to the population density of excited states are evaluated.

Journal

  • Plasma and Fusion Research

    Plasma and Fusion Research 5 001-001, 2010

    The Japan Society of Plasma Science and Nuclear Fusion Research

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