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Initial electron density ne,0 (SI unit: 1/m3). This value represents some initial seed electrons in the plasma. If this number is too low then the plasma might not sustain itself. If this number is too high then numerical instabilities can arise at early time steps.
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Initial mean electron energy e0 (SI unit: V). Enter an approximate guess for the mean electron energy in the reactor. COMSOL Multiphysics automatically computes the exact mean electron energy after solving but the closer the guess is set to the expected value the easier it is to find a solution.
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Electric potential V (SI unit: V). In nearly all cases the value should be zero. This initial value must also be consistent with any boundary conditions on the electric potential in the model.
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