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Title: Development of a non-LTE spectral post-processor for dense plasma simulations with application to spectroscopic diagnostics in spherical implosions at Nova

Abstract

A new non-LTE spectroscopy post-processing package is described. The package processes dump files from 1 or 2-dimensional radiation-hydrodynamics code simulations. Given the grid motion, temperatures, and ion densities contained in the dump files, as well as data from an arbitrarily detailed atomic model, the post-processor calculates internally consistent detailed frequency dependent opacities and radiation fields. The radiation transport equation is solved in the S{sub n} approximation using lambda iteration. Sub-cycling is used to achieve a more accurate solution to both the kinetics and radiation field calculations. Line broadening is included using Voigt widths based on the atomic rate coefficients, and Stark widths are included for K-shell spectra. The Sobolev escape factor approximation is available as an option. This post-processing package has been used to analyze spectra obtained recently at Nova with Ar doped deuterium filled capsules. The dopant was designed to be primarily a density diagnostic but can also be used for temperature diagnosis as well. We have run this post-processor with a wide array of atomic models for Argon, ranging from one containing only singly excited levels for the Hydrogenic, He-like, and Li-like sequences, to one containing a large number of doubly- and triply-excited levels in these sequences. Wemore » show a strong dependence of the degree of agreement between simulation and experiment on the model complexity with only the most complex model in close agreement.« less

Authors:
;  [1]; ;  [2]
  1. Los Alamos National Lab., NM (United States)
  2. Lawrence Livermore National Lab., CA (United States)
Publication Date:
Research Org.:
Los Alamos National Lab., NM (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10133365
Report Number(s):
LA-UR-93-420; CONF-931141-1
ON: DE93007327
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Radiative properties of hot dense matter,Santa Barbara, CA (United States),2-5 Nov 1993; Other Information: PBD: [1993]
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; LASER IMPLOSIONS; X-RAY SPECTROSCOPY; INERTIAL CONFINEMENT; PLASMA DIAGNOSTICS; PLASMA SIMULATION; NOVA FACILITY; STARK EFFECT; TEMPERATURE MEASUREMENT; LINE BROADENING; 700411; 700320; INERTIAL CONFINEMENT DEVICES; PLASMA DIAGNOSTIC TECHNIQUES AND INSTRUMENTATION

Citation Formats

Pollak, G D, Delamater, N D, Nash, J K, and Hammel, B A. Development of a non-LTE spectral post-processor for dense plasma simulations with application to spectroscopic diagnostics in spherical implosions at Nova. United States: N. p., 1993. Web.
Pollak, G D, Delamater, N D, Nash, J K, & Hammel, B A. Development of a non-LTE spectral post-processor for dense plasma simulations with application to spectroscopic diagnostics in spherical implosions at Nova. United States.
Pollak, G D, Delamater, N D, Nash, J K, and Hammel, B A. Mon . "Development of a non-LTE spectral post-processor for dense plasma simulations with application to spectroscopic diagnostics in spherical implosions at Nova". United States. https://www.osti.gov/servlets/purl/10133365.
@article{osti_10133365,
title = {Development of a non-LTE spectral post-processor for dense plasma simulations with application to spectroscopic diagnostics in spherical implosions at Nova},
author = {Pollak, G D and Delamater, N D and Nash, J K and Hammel, B A},
abstractNote = {A new non-LTE spectroscopy post-processing package is described. The package processes dump files from 1 or 2-dimensional radiation-hydrodynamics code simulations. Given the grid motion, temperatures, and ion densities contained in the dump files, as well as data from an arbitrarily detailed atomic model, the post-processor calculates internally consistent detailed frequency dependent opacities and radiation fields. The radiation transport equation is solved in the S{sub n} approximation using lambda iteration. Sub-cycling is used to achieve a more accurate solution to both the kinetics and radiation field calculations. Line broadening is included using Voigt widths based on the atomic rate coefficients, and Stark widths are included for K-shell spectra. The Sobolev escape factor approximation is available as an option. This post-processing package has been used to analyze spectra obtained recently at Nova with Ar doped deuterium filled capsules. The dopant was designed to be primarily a density diagnostic but can also be used for temperature diagnosis as well. We have run this post-processor with a wide array of atomic models for Argon, ranging from one containing only singly excited levels for the Hydrogenic, He-like, and Li-like sequences, to one containing a large number of doubly- and triply-excited levels in these sequences. We show a strong dependence of the degree of agreement between simulation and experiment on the model complexity with only the most complex model in close agreement.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1993},
month = {2}
}

Conference:
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