Université de Toulouse, UPS, INPT, Laboratoire Plasma et Conversion d'Energie, 118 route de Narbonne, F-31062 Toulouse cedex 9, France.
Phys Rev Lett. 2010 Jan 8;104(1):015002. doi: 10.1103/PhysRevLett.104.015002. Epub 2010 Jan 6.
High power microwave breakdown at atmospheric pressure leads to the formation of filamentary plasma arrays that propagate toward the source. A two-dimensional model coupling Maxwell equations with plasma fluid equations is used to describe the formation of patterns under conditions similar to recent experiments and for a wave electric field perpendicular to the simulation domain or in the simulation domain. The calculated patterns are in excellent qualitative agreement with the experiments, with good quantitative agreement of the propagation speed of the filaments. The propagation of the plasma filaments is due to the combination of diffusion and ionization. Emphasis is put on the fact that free electron diffusion (and not ambipolar diffusion) associated with ionization is responsible for the propagation of the front.
在大气压下，高功率微波会发生击穿，形成向源传播的丝状等离子体阵列。我们采用二维模型，将麦克斯韦方程组与等离子体流体方程组耦合，来描述与最近实验相似条件下的模式形成，以及波电场垂直于或在模拟域中的情况。计算出的模式与实验结果非常吻合，丝的传播速度也有很好的定量吻合。等离子体丝的传播是由于扩散和电离的结合。我们强调这样一个事实，即与电离相关的自由电子扩散（而不是双极扩散）是前沿传播的原因。
