Spectroscopic Diagnostic of Helium-Hydrogen RF Plasma under the Influence of Radiation Trapping
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概要
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The electron temperature and density, atomic hydrogen density and temperature in a helium-hydrogen RF plasma are determined from the visible emission line intensities of both atoms by considering photoexcitation from the ground state accompanied by radiation trapping in the plasma. From the observed helium line intensity, and the hydrogen Balmer γ line intensity which is little affected by photoexcitation, parameters other than the atomic hydrogen temperature are determined using a helium atom collisional-radiative model [Sawada et al., Plasma Fusion Res. 5, 001 (2010)], which includes photoexcitation for helium singlet P states, and a hydrogen atom collisional-radiative model in which photoexcitation is ignored. The atomic hydrogen temperature is determined to reproduce the Balmer α and β line intensities by using an iterative hydrogen atom collisional-radiative model [Sawada, J. Plasma Phys. 72, 1025 (2006)] that calculates the photoexcitation rates.
著者
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GOTO Motoshi
National Insitute for Fusion Science
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Sawada Keiji
Faculty Of Engineering Osaka University
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EZUMI Naomichi
Nagano National College of Technology, 716 Tokuma, Nagano 381-8550, Japan
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GOTO Motoshi
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
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