The role of energetic electrons in self-oscillations of a discharge plasma
The role of energetic electrons in self-oscillations of a discharge plasma
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高能电子在放电等离子体自振荡中的作用
DOI：
10.1063/1.1406134
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发表时间：
2001
影响因子：
2.2
通讯作者：
W. Ding
中科院分区：
文献类型：
--
作者：
Y. Ping;C. Yu;Jinlin Xie;J. Ke;Xi;H. Li;W. Ding
通过测量等离子体电势、电子密度和电子速度分布函数的时空演化，研究了高能电子在放电等离子体周期性自振荡中的作用。结果表明，自激振荡涉及鞘层的不稳定性、双电层的传播以及电离、热化和扩散之间的竞争。高能电子是连接这些过程形成振荡周期的关键因素。根据物理过程估算了循环中各相的时间间隔，计算值与实验测量值符合较好。研究了探针微扰对振荡的影响，发现振荡周期的长短与高能电子的数量有关，高能电子越多，振荡周期越短。
The role of energetic electrons in periodic self-oscillations of a discharge plasma has been studied by measuring the spatiotemporal evolution of plasma potential, electron density, and electron velocity distribution function. It is found that the self-oscillation involves the instabilities of sheaths, propagation of a double layer and competition between the ionization, thermalization, and diffusion. The energetic electrons are the key factor which links these processes to form the oscillation cycle. The time interval of each phase in the cycle is estimated according to the physical process and the calculations are in agreement with experimental measurements. The study of the probe perturbation effect on the oscillations indicates that the length of the oscillation period is related to the amount of energetic electrons; the more energetic electrons, the shorter the period.