Definitions

The Definitions section provides the user three different options. The first being defining/assigning material to the model geometry which must be done for both internal and surface charging simulations. The second being defining/assigning Chassis definitions to the model geometry which can only be done for surface and coupled charging simulations. The third is being able to define potential boundary conditions which is an option only for internal charging scenarios.

Assigning materials to the model geometry mainly dictates how the surrounding plasma and/or particle flux ultimately reacts with your model and the chosen values for the material parameters are of up-most importance. Since CHARGE uses a different solver depending on whether its a surface or internal simulation, the material assignments are separated like this as well with surface materials applied solely to surfaces and internal materials assigned to solids.

The Chassis definition allows the user to define initial voltages and resistances to surfaces. This is useful for charging simulations.

The Boundary Condition option in Definitions allows you to set a potential bias on a specific surface for an internal charging simulation, giving the user freedom to either ground a portion of their model or apply a non-zero voltage.

Options for the Definitions section are:

1.   Materials

2. Chassis

3.   Boundary Conditions