Transition characteristics and electron kinetics in microhollow cathode discharges
Transition characteristics and electron kinetics in microhollow cathode discharges
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DOI：
10.1063/5.0033282
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发表时间：
2021-01
影响因子：
3.2
通讯作者：
Yangyang Fu;B. Zheng;Peng Zhang;Q. Fan;J. Verboncoeur
中科院分区：
文献类型：
--
作者：
Yangyang Fu;B. Zheng;Peng Zhang;Q. Fan;J. Verboncoeur
我们利用二维粒子池/蒙特卡罗碰撞（2d3v）模拟，证明了具有微结构阴极的微隙中微放电的跃迁特征和电子动力学。研究发现，在较低压力下，微放电在空心腔内形成微空心阴极放电，而在较高压力下，主放电向腔外移动，位于阴极矩形突出尖端上方。通过捕获跃迁特征，给出了微放电参数（如电势和电子密度）的空间分布。基于电子玻尔兹曼方程的矩分析，研究了微放电的电子动力学。对电子功率吸收的碰撞和非碰撞分量进行了分解，这是以往很少对微放电进行研究的。该结果为在不同压力条件下结构电极MHCD的形成提供了基本的见解，这可能有助于在实际应用中设计和制造微等离子体器件。
We demonstrate the transition characteristics and electron kinetics of microdischarges in a microgap with a cathode having microstructures using two-dimensional particle-in-cell/Monte Carlo collision (2d3v) simulations. It is found that the microdischarge is inside the hollow cavity at lower pressures, forming microhollow cathode discharges (MHCDs), while the dominant discharge moves outside the cavity at higher pressures, locating above the cathode rectangular protrusion tip. The spatial distributions of the microdischarge parameters (e.g., electric potential and electron density) are presented by capturing the transition characteristics. The electron kinetics of the microdischarges are examined based on the moment analysis of the electron Boltzmann equation. The collisional and non-collisional components of the electron power absorption are decomposed, which were seldomly investigated for microdischarges previously. The results provide fundamental insights into MHCD formation with a structured electrode at varying pressure conditions, which could be beneficial for the design and fabrication of microplasma devices in practical applications.