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The charge transport formulations in Gas, Liquid, and Solid features in the Electric Discharge interface now include a background ionization with a rate of 10 cm-3 s-1 by default. From the physics standpoint, this background ionization serves as a crucial source of seed electrons. In numerical simulations that use a logarithmic formulation for charge carriers, it also contributes to improved numerical stability. However, since the background ionization rate is several orders of magnitude lower than that of dominant source terms — such as impact ionization — it has a negligible effect in models where those stronger processes prevail.
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The Initial Values and default values of the Number Density boundary condition for charge carriers have been changed depending on the dielectric medium (Gas, Liquid, or Solid). The new values can help to improve model initialization and convergence.
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