A critical analysis of ionising wave propagation mechanisms in breakdown
A critical analysis of ionising wave propagation mechanisms in breakdown
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击穿时电离波传播机制的批判性分析
DOI：
10.1088/0022-3727/13/6/015
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发表时间：
1980
期刊：
影响因子：
--
通讯作者：
P. Bayle
中科院分区：
文献类型：
--
作者：
I. Abbas;P. Bayle
研究了平行平面电极结构的脉冲过电压气体放电中电离波的形成和传播。对于不同的初始电子分布，详细研究了电子密度、离子密度以及空间电荷畸变场的时空演化。这项研究阐明了在阳极和阴极电离波之前存在的电子的重要作用，并特别说明了波前分布在传播过程中是如何演变的。在所有情况下，只要放电间隙足够大，波前就会转变为由具有极高电子密度和场梯度的激波区定义的电子冲击波。这限制了气体放电模型的有效范围，这些模型既忽略了载流子的热扩散，也忽略了光剥离的气体光致电离。
The formation and propagation of ionising waves in impulsive overvolted gas discharges for parallel plane electrode geometry is studied. The spatio-temporal evolution of the electronic and ionic densities together with the space-charge distorted field was thoroughly examined for different initial electron distributions. The study elucidates the important role of the electrons present ahead of both the anode and cathode ionising waves and shows particularly how the wavefront profile evolves during its propagation. In all cases, provided that the discharge gap is sufficiently large, the wavefront is transformed into an electron shock wave defined by a shock zone of extremely high electronic density and field gradients. This limits the domain of validity of the gas discharge models that neglect both the thermal diffusion of charge carriers and gas photoionisation of photodetachment.