Collisional-Radiative Model for Spectroscopic Diagnostic of Optically Thick Helium Plasma
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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 1<sup>1</sup>S to the 2<sup>1</sup>P, 3<sup>1</sup>P, and 4<sup>1</sup>P 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.
- Plasma and Fusion Research
Plasma and Fusion Research (5), 001-001, 2010
The Japan Society of Plasma Science and Nuclear Fusion Research