skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Non-LTE Opacity Computation on GPUs

Authors:
 [1]
  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
DOE/LANL
OSTI Identifier:
1148954
Report Number(s):
LA-UR-14-26124
DOE Contract Number:
AC52-06NA25396
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
Nuclear Physics & Radiation Physics(73)

Citation Formats

Holladay, Daniel. Non-LTE Opacity Computation on GPUs. United States: N. p., 2014. Web. doi:10.2172/1148954.
Holladay, Daniel. Non-LTE Opacity Computation on GPUs. United States. doi:10.2172/1148954.
Holladay, Daniel. Mon . "Non-LTE Opacity Computation on GPUs". United States. doi:10.2172/1148954. https://www.osti.gov/servlets/purl/1148954.
@article{osti_1148954,
title = {Non-LTE Opacity Computation on GPUs},
author = {Holladay, Daniel},
abstractNote = {},
doi = {10.2172/1148954},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Aug 04 00:00:00 EDT 2014},
month = {Mon Aug 04 00:00:00 EDT 2014}
}

Technical Report:

Save / Share:
  • The results of three LASNEX simulations of Argon seeded DT filled microballoon implosions in which the details of the hot electron preheat have been varied are post analyzed with a full collisional radiative model. The resulting simulated spectra are compared. A similar calculation is performed on a pure argon microballoon implosion. Some features of the average atom model used by LASNEX are compared to those calculated by the collisional radiative model.
  • The K-shell radiation emitted by the argon seeded in the DT fuel of a CO2 Laser driven microballoon implosion is modeled by post processing the results of a hydrodynamic (LANL) calculation. The entire K-shell spectrum is self-consistently calculated including: transport of both lines and continua, collisional-radiative equilibrium (CRE) number densities, Stark profiles for the first four resonance lines of Ar XVII and XVIII, and Voigt profiles for the remaining lines. The CRE ionic number densities are presented and compared to the corresponding Average Atom quantities calculated by LASNEX.
  • During the period of performance of this contract Science Applications International Corporation (SAIC) has aided Lawrence Livermore National Laboratory (LLNL) in the development of an unclassified modeling tool for studying time evolution of high temperature ionizing and recombining plasmas. This report covers the numerical code developed, (D)ynamic (D)etailed (C)onfiguration (A)ccounting (DDCA), which was written to run on the National Magnetic Fusion Energy Computing Center (NMFECC) network as well as the classified Livermore Computer Center (OCTOPUS) network. DDCA is a One-Dimensional (1D) time dependent hydrodynamic model which makes use of the non-LTE detailed atomic physics ionization model DCA. 5 refs.
  • An effort to develop sub-critical-density high-Z metal-doped and pure metal foams as laser-driven x-ray sources is described. The main idea is that the laser beams preferentially heat the electrons, and if the plasma is sufficiently low density so that the heating rate is greater than the equilibration rate via electron-ion collisions, then the electron temperature in the plasma is much greater than the ion temperature as long as the laser is on. In such a situation the plasma is not in local thermal equilibrium (LTE), it heats supersonically and volumetrically, and the conversion efficiency of laser beam energy to multi-keVmore » L-shell and K-shell radiation is much higher than what it would be in LTE plasma.« less