HELIOS Major Features

HELIOS is an easy-to-use 1-D radiation-hydrodynamics code. Sample uses of HELIOS include simulating the dynamics of:
		laser-produced plasmas
		discharge-produced plasmas (z-pinches)
		radiatively-heated plasmas
		shock propagation in materials.

HELIOS-CR is an enhanced version of HELIOS which includes the option to simulate the dynamics of non-LTE* plasmas using an inline collisional-radiative (C-R) model.

Major features of HELIOS and HELIOS-CR

Performs 1-D simulations for planar, cylindrical, and spherical plasmas.

Updates energy and momentum conservation equations in a Lagrangian reference frame (i.e., grid moves with fluid).

Includes an easy-to-use graphical user interface for problem setup, and monitoring simulation progress.

Includes a graphics application HYDROPLOT for visualizing results.

	Viewing results as line plots, 2-D color contours, 3-D surface plots
	Editing and saving plot settings
	Copying and pasting plots into MS Office applications

Energy equations solved for either one-temperature (T<ion> = T<elec>) or two-temperature (separate T<ion> and T<elec>) plasmas.

Plasma thermal conduction is performed, with electron conduction being flux-limited, using:

	Spitzer conductivity
	SESAME-formatted tabular conductivity
	A user-specified (constant) conductivity
	A mixture of Spitzer and constant conductivities

Includes energy deposition models for:

	Laser deposition
	MHD effects (cylindrical geom. only)
	External radiation sources

Radiation transport for multiple photon energy groups is computed using one of the following models:

Flux-limited radiation diffusion

Multi-angle short characteristics (planar geometry only)

Supports use of SESAME equation of state (EOS), thermal conductivity, and electrical resistivity data.

Includes option to calculate fusion product yields and rates.

Includes the following atomic processes in collisional-radiative modeling:**

	Collisional ionization, recombination, excitation, and deexcitation
	Photoionization and stimulated recombination
	Photoexcitation and stimulated emission
	Spontaneous decay
	Radiative recombination
	Dielectronic recombination, autoionization, and electron capture.

Utilizes ATBASE atomic database for supplying:**

	Photoionization cross-sections
	Oscillator strengths
	Collisional ionization cross-sections
	Collisional excitation cross-sections
	Atomic level energies and transition energies
	Dielectronic recombination, autoionization, and electron capture rates.

Interfaces with other Prism applications:

	SPECT3D: for generating spectra and images based on radiation-hydrodynamics results for comparison with experimental spectral and imaging data
	HydroPLOT: a graphics tool for viewing calculation results.
	VISRAD: for generating input files for time- and frequency-dependent external radiation sources.

Helios automated grid setup.

Helios progress monitor.

Sample of zone (mass) motion.

Sample temperature color contour.

*LTE = local thermodynamic equilibrium

**HELIOS-CR application only.