Spatial Regions Setup

The plasma (or material) grid in HELIOS is set up by defining the properties of one or more spatial regions. For each region, the following may be entered:

• A region name (each region must have a unique name)
• Initial conditions
• Equation of state parameters
• Opacity parameters
• Conductivity parameters
• Fusion parameters
• Electrical resistivity parameters
• Particle beam
• DCA material composition

To add a new region, select the New Region button. As regions are added to the grid, their names will appear in the regions box at the top of the main window, where the minimum and maximum radii for each of the regions are also shown.

Regions can be deleted by selecting the region name in the regions box, and pressing the Delete Region button.

A region can be duplicated by selecting an existing region in the regions box, and pressing the Duplicate Region button. This adds a new region to the grid, and copies all parameters of the existing region to the new region.

A region can be specified to be Void. In void regions, no Joule heating or laser energy deposition occurs, and the B-field does not contribute to the momentum equation in void cells. Void cells are also ignored in updating time step controls.

The regions in the regions box are ordered according to their position in the grid. To change the position of a region (relative to another existing region), select the region and apply either the up or down arrow on the right side of the regions box. The minimum and maximum radii for each of the regions are then automatically updated.

After setting up all spatial regions, zoning for the plasma grid must be set up based on the mass density and number of zones specified for each of the regions. To do this, press the Setup Zoning button. Alternatively, the zoning can generally be checked when starting the simulation (e.g., when pressing the Run Simulation button).

Next