EquationSystem

The EquationSystem class keeps track of settings for all unknown quantities which DREAM solves for. This class does very little work on its own and rather acts as a container for the objects representing specific unknown quantities.

Each unknown quantity which has specific settings is represented by its own Python class. The object is initialized with defaults when the EquationSystem class is created (which happens as soon as the parent DREAMSettings object is created) and can be accessed as a property of the equation system. The following unknown quantities are available in any EquationSystem object:

Quantity	Description
E_field	Electric field
f_hot	Hot electron distribution function
f_re	Runaway electron distribution function
ions	Ion densities and charge states
j_ohm	Ohmic current density
n_cold	Cold electron density
n_re	Runaway electron density
psi_p	Poloidal magnetic flux
spi	Shattered pellet shards
T_cold	Cold electron temperature

Examples

Unknown quantities can be accessed in the following way:

ds = DREAMSettings()

ds.eqsys.E_field.setPrescribedData(0.3)  # Uniform electric field profile (V/m)
ds.eqsys.T_cold.setPrescribedData(1100)  # Uniform temperature profile (eV)

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