The object of interest are discharge modes in self-pulsing discharges in argon at atmospheric pressure. The modelling is performed assuming plane-parallel arrangement with a 1.5 mm gap, with a constant DC voltage connected via resistor to the discharge cell. The additional capacitor with a constant capacitance of 5 pF is connected parallel to the discharge cell. The applied DC voltage and resistance were varied to investigate their influence on the discharge modes.
\n" }, "medium": { "name": "Ar", "properties": "Pure argon, gas pressure is 760 Torr, constant gas temperature of 300 K
\n" }, "target": [], "diagnostics": { "name": "fluid-Poisson model, plasma chemical model", "properties": "Model: Fluid-Poisson model in 1D;
\nComputational software: FPSol;
\nNumerical method: Finite difference method;
\nTime-stepping procedure: Constant time step
\nCalculated data were post-processed with python (https://www.python.org), Matplotlib (https://matplotlib.org) and Origin Pro (https://www.originlab.com/).
The self-pulsing discharge in argon at atmospheric pressure is investigated by means of time-dependent and spatially one-dimensional fluid-Poisson modelling in 1D geometry. The model is employed to study influence of the circuit on the discharge modes of self-pulsing discharge. The model comprises a set of balance equations for the particle number densities of electrons and the most important argon species (atomic Ar^+ and molecular Ar_2^+ ions, as well as the lumped excited atomic Ar^* and molecular Ar_2^* states of argon), Poisson\u2019s equation for the electric potential and electric field, the electron energy balance equation. Additional momentum balance equation for ions is solved to determine the ionic fluxes, while electrons employ consistent drift-diffusion approximation. The quasi-neutral initial conditions and physically-based boundary conditions, accounting for thermal flux and partial reflection of the particles, are used. The additional term describing the ion-induced emission of secondary electrons is included into the boundary conditions for the balance equations for the particle number density and energy density of electrons.
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