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

Conference · Fri Oct 01 00:00:00 EDT 2010

OSTI ID:1027088

Giuliani, J L ^[1]; Davis, J ^[1]; DasGupta, A ^[1]; Apruzese, John P ^[1]; Jennings, Christopher A; Clark, R W ^[1]; Ampleford, David J; Bailey, James E; Thornhill, Joseph W ^[1]; Cuneo, Michael Edward; Rochau, Gregory Alan; Coverdale, Christine Anne; Jones, Brent Manley; Hansen, Stephanie B

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1. Naval Research Laboratory, Washington, DC

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.

• Research Organization: Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 1027088
• Report Number(s): SAND2010-7090C; TRN: US1105171
• 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

Related Subjects

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