Glossary

ATBASE

A suite of atomic physics codes designed to generate high-quality atomic data for collisional-radiative spectral analysis simulations. It utilizes a suite of atomic structure and modeling codes, including Hartree-Fock, Dirac-Fock, configuration interaction, and distorted wave codes. For more information, see the Prism ATBASE web site.

atomic model file

A file that contains information on selection and collapsing of atomic energy levels. Atomic model files are generated by, and can also be edited by, AtomicModelBuilder.

AtomicModelBuilder

Application to enable users to build custom atomic model files. Supports selection of and "bundling" of atomic energy levels contained in atomic data base (ATBASE) files.

 

collapse model

A set of parameters used to specify how the energy levels in a given base superconfiguration are collapsed.

Equation of State (EOS)

The relation between the plasma (or separately electron or ion) temperature, pressure, internal energy, and density.

HELIOS Radiation-Hydrodynamics Code

A 1-D radiation-hydrodynamics code used to simulate the evolution of high energy density plasmas.

Local Thermodynamic Equilibrium (LTE)

A plasma state in which all thermodynamic properties of a material (including atomic level populations, opacities, emissivities, pressures, and internal energies) depend only on the local value of the temperature and density. In LTE, the atomic level populations are determined from the Saha equation and Boltzmann statistics.

PrismPlot

PrismPlot is a general purpose plot library used in appications codes developed at Prism Computational Sciences. For additional information, see the PrismPlot online documentation.

QEOS

Quotidian Equation of State model originally developed by More et al. (Phys. Fluids 31, 3059, 1988). The model developed at Prism is based on the methodology outlined in this paper.

SESAME

Equation of state tables from Los Alamos National Laboratories. For more information, see the LANL SESAME web site.

SPECT3D

The SPECT3D imaging and spectral analysis package computes images and spectra that can be compared with experimental data. In simulating spectra and images, SPECT3D utilizes plasma temperature and density distributions from: 1-D, 2-D, or 3-D radiation-hydrodynamics codes; 1-D or 2-D distributions from the PLASMAGEN plasma grid generation code; or a simple single-cell plasma. For more information, see the Prism SPECT3D web site.

 

superconfiguration

A collection of atomic energy levels grouped together. When used in collisional-radiative calculations, the use of superconfigurations can significantly reduce CPU and memory requirements.

VISRAD

VISRAD is a 3-D view factor code that can be used to simulate the radiation field environment throughout a three-dimensional grid of surface elements. It is designed to predict temperature and radiative flux distributions throughout target components in laser and Z-pinch laboratory plasma experiments. It features a user-friendly graphical interface for setting up 3-D object grids and displaying results.

 

For a given surface element (or set of surface elements) VISRAD can compute the time- and frequency-dependent incident flux onto that surface, and write the results to a file. HELIOS can utilize VISRAD incident flux files in specifying external radiation sources. For more information, see the Prism VisRad web site.