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Title: Doppler effects on 3-D non-LTE radiation transport and emission spectra.

Abstract

Spatially and temporally resolved X-ray emission lines contain information about temperatures, densities, velocities, and the gradients in a plasma. Extracting this information from optically thick lines emitted from complex ions in dynamic, three-dimensional, non-LTE plasmas requires self-consistent accounting for both non-LTE atomic physics and non-local radiative transfer. We present a brief description of a hybrid-structure spectroscopic atomic model coupled to an iterative tabular on-the-spot treatment of radiative transfer that can be applied to plasmas of arbitrary material composition, conditions, and geometries. The effects of Doppler line shifts on the self-consistent radiative transfer within the plasma and the emergent emission and absorption spectra are included in the model. Sample calculations for a two-level atom in a uniform cylindrical plasma are given, showing reasonable agreement with more sophisticated transport models and illustrating the potential complexity - or richness - of radially resolved emission lines from an imploding cylindrical plasma. Also presented is a comparison of modeled L- and K-shell spectra to temporally and radially resolved emission data from a Cu:Ni plasma. Finally, some shortcomings of the model and possible paths for improvement are discussed.

Authors:
 [1];  [1];  [1];  [1]; ;  [1]; ; ;  [1]; ; ; ; ;
  1. Naval Research Laboratory, Washington, DC
Publication Date:
Research Org.:
Sandia National Laboratories
Sponsoring Org.:
USDOE
OSTI Identifier:
1027088
Report Number(s):
SAND2010-7090C
TRN: US1105171
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the 14th International Workshop on Radiative Properties of Hot, Dense Matter held October 3-8, 2010 in Marbella, Spain.
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ABSORPTION SPECTRA; ATOMIC MODELS; ATOMIC PHYSICS; ATOMS; DOPPLER EFFECT; EMISSION SPECTRA; K SHELL; PLASMA; RADIANT HEAT TRANSFER; RADIATION TRANSPORT; SPECTRA; TRANSPORT

Citation Formats

Giuliani, J L, Davis, J, DasGupta, A, Apruzese, John P, Jennings, Christopher A, Clark, R W, Ampleford, David J, Bailey, James E, Thornhill, Joseph W, Cuneo, Michael Edward, Rochau, Gregory Alan, Coverdale, Christine Anne, Jones, Brent Manley, and Hansen, Stephanie B. Doppler effects on 3-D non-LTE radiation transport and emission spectra.. United States: N. p., 2010. Web.
Giuliani, J L, Davis, J, DasGupta, A, Apruzese, John P, Jennings, Christopher A, Clark, R W, Ampleford, David J, Bailey, James E, Thornhill, Joseph W, Cuneo, Michael Edward, Rochau, Gregory Alan, Coverdale, Christine Anne, Jones, Brent Manley, & Hansen, Stephanie B. Doppler effects on 3-D non-LTE radiation transport and emission spectra.. United States.
Giuliani, J L, Davis, J, DasGupta, A, Apruzese, John P, Jennings, Christopher A, Clark, R W, Ampleford, David J, Bailey, James E, Thornhill, Joseph W, Cuneo, Michael Edward, Rochau, Gregory Alan, Coverdale, Christine Anne, Jones, Brent Manley, and Hansen, Stephanie B. Fri . "Doppler effects on 3-D non-LTE radiation transport and emission spectra.". United States.
@article{osti_1027088,
title = {Doppler effects on 3-D non-LTE radiation transport and emission spectra.},
author = {Giuliani, J L and Davis, J and DasGupta, A and Apruzese, John P and Jennings, Christopher A and Clark, R W and Ampleford, David J and Bailey, James E and Thornhill, Joseph W and Cuneo, Michael Edward and Rochau, Gregory Alan and Coverdale, Christine Anne and Jones, Brent Manley and Hansen, Stephanie B},
abstractNote = {Spatially and temporally resolved X-ray emission lines contain information about temperatures, densities, velocities, and the gradients in a plasma. Extracting this information from optically thick lines emitted from complex ions in dynamic, three-dimensional, non-LTE plasmas requires self-consistent accounting for both non-LTE atomic physics and non-local radiative transfer. We present a brief description of a hybrid-structure spectroscopic atomic model coupled to an iterative tabular on-the-spot treatment of radiative transfer that can be applied to plasmas of arbitrary material composition, conditions, and geometries. The effects of Doppler line shifts on the self-consistent radiative transfer within the plasma and the emergent emission and absorption spectra are included in the model. Sample calculations for a two-level atom in a uniform cylindrical plasma are given, showing reasonable agreement with more sophisticated transport models and illustrating the potential complexity - or richness - of radially resolved emission lines from an imploding cylindrical plasma. Also presented is a comparison of modeled L- and K-shell spectra to temporally and radially resolved emission data from a Cu:Ni plasma. Finally, some shortcomings of the model and possible paths for improvement are discussed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2010},
month = {10}
}

Conference:
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