The environmental improvements by pulsed discharge plasma, a type of nonthermal plasma, have received much attention all over the world. The observation of discharge plasmas is beneficial for better understanding of the plasma physics of this growing field. Recently, nanosecond (ns) pulsed discharge with a short pulse duration of 5 ns achieved the higher energy efficiency on ozone generation and NO removal. However, the underlying mechanisms of these high efficiencies remain unclear. In the present study, the effects of electrode geometry on propagation process of ns pulsed discharge in coaxial electrodes were investigated using an ICCD camera. As the results, increasing wire diameters from 0.2 to 2.0 mm lead the different streamer discharge parameters; propagation velocity of streamer heads from 4.8 mm/ns to 12.5 mm/ns, peak of discharge current from 243 to 328 A, respectively. Therefore, it is concluded that the wire diameter is one of the paramount parameters to control the characteristics of the ns pulsed streamer discharge.

中文翻译：

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同轴电极中纳秒脉冲放电的行为特性

脉冲放电等离子体（一种非热等离子体）对环境的改善已引起全世界的广泛关注。放电等离子体的观察有利于更好地了解这个不断发展的领域的等离子体物理学。近来，具有5ns的短脉冲持续时间的纳秒（ns）脉冲放电在臭氧产生和NO去除上实现了更高的能量效率。但是，这些高效率的潜在机制仍不清楚。在本研究中，使用ICCD相机研究了电极几何形状对ns脉冲放电在同轴电极中传播过程的影响。结果，导线直径从0.2毫米增加到2.0毫米会导致不同的流光放电参数。拖缆头的传播速度从4.8 mm / ns到12.5 mm / ns，放电电流的峰值分别从243至328A。因此，可以得出结论，线径是控制ns脉冲流光放电特性的最重要参数之一。