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Line profile modeling for non-LTE partially ionized plasmas based on average atom model with l–splitting

Published online by Cambridge University Press:  09 March 2009

T. Nishikawa ,
H. Takabe  and
K. Mima
T. Nishikawa
Affiliation:
Institute of Laser Engineering, Osaka University, Suita, Osaka 565, Japan
H. Takabe
Affiliation:
Institute of Laser Engineering, Osaka University, Suita, Osaka 565, Japan
K. Mima
Affiliation:
Institute of Laser Engineering, Osaka University, Suita, Osaka 565, Japan
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Abstract

We have developed a new opacity modeling of partially ionized high-Z plasma to solve radiation transport in fluid codes. The average atom model is used to describe the electronic state of the plasma. The electronic state of the plasma is determined by solving the collisional radiative equilibrium model. We have taken into account the electron energy level splitting owing to the difference in the azimuthal quantum number. To model the line groups made of the same electronic transitions from ions indifferent charge states, we used a statistical method and calculated the distribution of the charge states from the averaged electron population in each bound state. By using the new opacity model, we can well reproduce the X-ray spectra from the plasmas. It is found that the Δn = 0 transition can explain the peaked spectra near hv = 300 eV and l–splitted emission of the n = 5–4 transition can explain the flat spectra in the region of hv = 400–800 eV seen in the experiments.

Type
Research Article
Information
Laser and Particle Beams , Volume 11 , Issue 1 , March 1993 , pp. 81 - 87
Copyright
Copyright © Cambridge University Press 1993

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References

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