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Adding Boltzmann distributed electrons

Warp can include a region in which Boltzmann distributed electrons are added. This can be used to simulate a plasma source. The region can be limited by defining

w3d.xbemin = ...
w3d.xbemax = ...
w3d.ybemin = ...
w3d.ybemax = ...
w3d.zbemin = ...
w3d.zbemax = ...

If these limits are not set, they default to +-LARGEPOS.

The distribution itself is given by the following parameters:

w3d.electrontemperature = ... # in eV
w3d.iondensity          = ... # in Coulomb/m^3
w3d.plasmapotential     = ... # in V

If ions are created inside this plasma, the voltage of the injection source should be the same as the plasmapotential

top.vinject = w3d.plasmapotential


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