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Non-LTE radiation transport in moderate-density plasmas

Published online by Cambridge University Press:  09 March 2009

J. J. MacFarlane ,
P. Wang  and
G. A. Moses
J. J. MacFarlane
Affiliation:
Fusion Technology Institute, 1500 Johnson Drive, University of Wisconsin, Madison, Wisconsin 53706
P. Wang
Affiliation:
Fusion Technology Institute, 1500 Johnson Drive, University of Wisconsin, Madison, Wisconsin 53706
G. A. Moses
Affiliation:
Fusion Technology Institute, 1500 Johnson Drive, University of Wisconsin, Madison, Wisconsin 53706
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Abstract

We present results from non-LTE line radiation transport calculations for high-temperature, optically thick plasmas with densities ∼1016-1020 ions/cm3. The calculations are based on an escape probability radiative transport model in which the atomic rate equations are solved self-consistently with the radiation field. Steady-state ionization and excitation populations are determined by detailed balancing of atomic processes, with photoexcitation effects included. Atomic data are computed using a combination of Hartree-Fock, semiclassical impact-parameter, and distorted-wave calculations. Our results indicate that the reabsorption of line radiation significantly alters the level populations and reduces the radiation flux from several types of fusion-related plasmas. We also compare our results with those obtained from multigroup radiation diffusion calculations, and discuss the ramifications of our results for ICF target chamber plasmas.

Type
Research Article
Information
Laser and Particle Beams , Volume 8 , Issue 4 , December 1990 , pp. 729 - 740
Copyright
Copyright © Cambridge University Press 1990

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