Collisional-Radiative Model for Spectroscopic Diagnostic of Optically Thick Helium Plasma
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概要
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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 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.
著者
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GOTO Motoshi
National Insitute for Fusion Science
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Iwamae Atsushi
Japan Atomic Energy Agency
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Sawada Keiji
Faculty Of Engineering Osaka University
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IWAMAE Atsushi
Japan Atomic Energy Agency, 801-1 Mukoyama, Naka, Ibaraki 311-0193, Japan
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YAMADA Yusuke
Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan
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MIYACHIKA Takamasa
Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan
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EZUMI Naomichi
Nagano National College of Technology, 716 Tokuma, Nagano 381-8550, Japan
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