Los Alamos LEDCOP Opacity Code

Conference · Sun Jan 01 00:00:00 EST 1989

OSTI ID:7265890

Magee, Jr, N H; Merts, A L

The Los Alamos Light Element (Z {le} 30) Detailed Configuration Opacity Code (LEDCOP), used to calculate opacities in local thermodynamic equilibrium (LTE), has been rewritten to incorporate more detailed atomic physics input. This paper outlines the recent improvements in the code that will provide new Rosseland opacities and, more importantly, better group mean opacities for modern radiation-hydrodynamic codes. The first major area of improvement is the inclusion of a complete set of accurate and internally-consistent Hartree-Fock LS term energies and oscillator strengths for each element. While relatively unimportant for equation of state (EOS), this does provide an improved distribution of line energies and strengths for group mean opacities. Secondly, the code now used Hartree-Fock photoionization cross sections for all ground and excited configurations of all ionization stages. These new cross sections are consistent with the bound-bound oscillator strengths and in many cases their inclusion affects the opacity more than the new LS oscillator strengths. 11 refs., 16 figs.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOD
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 7265890
• Report Number(s): LA-UR-90-176; CONF-8908210-1; ON: DE90008636
• Resource Relation: Conference: 1. international LTE opacity workshop and code comparison study, Abingdon (UK), 30 Aug - 5 Sep 1989
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
36 MATERIALS SCIENCE
IRON
OPACITY
COMPUTER CALCULATIONS
OXYGEN
CROSS SECTIONS
ENERGY-LEVEL TRANSITIONS
HARTREE-FOCK METHOD
L CODES
L-S COUPLING
OSCILLATOR STRENGTHS
PHOTOIONIZATION
THERMAL EQUILIBRIUM
COMPUTER CODES
COUPLING
ELEMENTS
EQUILIBRIUM
INTERMEDIATE COUPLING
IONIZATION
METALS
NONMETALS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
TRANSITION ELEMENTS
640302* - Atomic
Molecular & Chemical Physics- Atomic & Molecular Properties & Theory
360104 - Metals & Alloys- Physical Properties
360603 - Materials- Properties