New computational method for non-LTE, the linear response matrix
Abstract
My coauthors have done extensive theoretical and computational calculations that lay the ground work for a linear response matrix method to calculate non-LTE (local thermodynamic equilibrium) opacities. I will give briefly review some of their work and list references. Then I will describe what has been done to utilize this theory to create a computational package to rapidly calculate mild non-LTE emission and absorption opacities suitable for use in hydrodynamic calculations. The opacities are obtained by performing table look-ups on data that has been generated with a non-LTE package. This scheme is currently under development. We can see that it offers a significant computational speed advantage. It is suitable for mild non-LTE, quasi-steady conditions. And it offers a new insertion path for high-quality non-LTE data. Currently, the linear response matrix data file is created using XSN. These data files could be generated by more detailed and rigorous calculations without changing any part of the implementation in the hydro code. The scheme is running in Lasnex and is being tested and developed.
- Authors:
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE Office of Defense Programs (DP) (US)
- OSTI Identifier:
- 2848
- Report Number(s):
- UCRL-JC-132407; DP0102012
DP0102012; TRN: US0101372
- DOE Contract Number:
- W-7405-ENG-48
- Resource Type:
- Conference
- Resource Relation:
- Conference: 40th Annual Meeting, American Physical Society Division of Plasma Physics, New Orleans, LA (US), 11/16/1998--11/20/1998; Other Information: PBD: 2 Nov 1998
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABSORPTION; HYDRODYNAMICS; RESPONSE MATRIX METHOD; THERMODYNAMICS
Citation Formats
Fournier, K B, Grasiani, F R, Harte, J A, Libby, S B, More, R M, and Zimmerman, G B. New computational method for non-LTE, the linear response matrix. United States: N. p., 1998.
Web.
Fournier, K B, Grasiani, F R, Harte, J A, Libby, S B, More, R M, & Zimmerman, G B. New computational method for non-LTE, the linear response matrix. United States.
Fournier, K B, Grasiani, F R, Harte, J A, Libby, S B, More, R M, and Zimmerman, G B. 1998.
"New computational method for non-LTE, the linear response matrix". United States. https://www.osti.gov/servlets/purl/2848.
@article{osti_2848,
title = {New computational method for non-LTE, the linear response matrix},
author = {Fournier, K B and Grasiani, F R and Harte, J A and Libby, S B and More, R M and Zimmerman, G B},
abstractNote = {My coauthors have done extensive theoretical and computational calculations that lay the ground work for a linear response matrix method to calculate non-LTE (local thermodynamic equilibrium) opacities. I will give briefly review some of their work and list references. Then I will describe what has been done to utilize this theory to create a computational package to rapidly calculate mild non-LTE emission and absorption opacities suitable for use in hydrodynamic calculations. The opacities are obtained by performing table look-ups on data that has been generated with a non-LTE package. This scheme is currently under development. We can see that it offers a significant computational speed advantage. It is suitable for mild non-LTE, quasi-steady conditions. And it offers a new insertion path for high-quality non-LTE data. Currently, the linear response matrix data file is created using XSN. These data files could be generated by more detailed and rigorous calculations without changing any part of the implementation in the hydro code. The scheme is running in Lasnex and is being tested and developed.},
doi = {},
url = {https://www.osti.gov/biblio/2848},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Nov 02 00:00:00 EST 1998},
month = {Mon Nov 02 00:00:00 EST 1998}
}