Analysis of the plasma parameters of a tungsten-inert gas microarc with a length of 0.4 mm is carried out by means of a unified one-dimensional model. The model solves the fluid equations for the particle and energy conservation of the electrons and the heavy species in the plasma, and the heat conduction in the thermionic cathode. The particle transport of the electrons and the ions is coupled with the Poison’s equation. The spatial distributions of the densities of the charged particles, the electric potential and field, the components of the electric current density, the heating mechanisms and the resulting temperatures of the electrons and heavy particles are discussed in detail for an electric current density of 106 A/m2. The discharge voltage, estimates of the Debye length, the near-electrode voltage drop, and the thickness of the regions of space charge adjacent to the electrodes are obtained for current densities in the range from 5.3 × 103 up to 2.3 × 106 A/m2.

中文翻译：

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常压氩气中钨-惰性气体微弧的统一非平衡模拟

采用统一的一维模型对长度为0.4 mm的钨惰性气体微弧等离子体参数进行分析。该模型求解了等离子体中电子和重物质的粒子和能量守恒以及热离子阴极中的热传导的流体方程。电子和离子的粒子传输与 Poison 方程耦合。对于 106 A 的电流密度，详细讨论了带电粒子的密度、电势和场、电流密度的分量、加热机制以及电子和重粒子的温度的空间分布/平方米。放电电压、德拜长度的估计值、近电极电压降、