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Effect of surface protrusion on plasma sheath properties in atmospheric microdischarges

机译：表面突起对大气微探剂中等离子体鞘特性的影响

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摘要

The electric field enhancement due to the presence of cathode surface protrusion is investigated in atmospheric microdischarges with the goal of identifying the plasma sheath properties (such as cathode sheath thickness and electric field distortion). The electric field enhancement caused by surface protrusion is examined by adjusting the aspect ratio and the protrusion size. It is found that the cathode electric field enhancement depends strongly (weakly) on the aspect ratio (size) of the protrusion when it is much smaller than the discharge gap distance. In particular, the axial electric field in both vacuum and discharges becomes nonlinear with the protrusion on the cathode. The cathode sheath thicknesses obtained by two different methods are compared. With the same axial (or radial) protrusion dimension, increasing the aspect ratio will result in a significant decrease in the sheath thickness, whereas increasing the axial protrusion size with an unchanged aspect ratio will only lead to a slight decrease in the sheath thickness. The results contribute to predicting the relative plasma sheath properties from the geometrical parameter of the surface protrusion in atmospheric microdischarges. Published by AIP Publishing.
机译：电场增强由于阴极表面突起的存在下，在大气中的微放电进行了研究以确定该等离子体鞘属性（如阴极鞘的厚度和电场畸变）的目标。引起的表面突起的电场增强是通过调整纵横比和突出尺寸检查。据发现，阴极电场增强强烈地依赖于突起的纵横比（大小）（弱），当它比放电间隙的距离要小得多。特别地，在真空和放电的轴向电场变为非线性与阴极上的突起。通过两种不同的方法获得的阴极鞘的厚度进行比较。用相同的轴向（或径向）突出尺寸，增加纵横比将导致在鞘厚度的减少显著，而具有不变的高宽比增大轴向突出尺寸只会导致在鞘层厚度的轻微降低。结果有助于从大气微放电的表面突起的几何参数预测的相对等离子体鞘属性。通过AIP发布发布。

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  • 来源
    《Physics of plasmas》 |2018年第1期|共7页
  • 作者

    Fu Yangyang; Zhang Peng; Verboncoeur John P.; Christlieb Andrew J.; Wang Xinxin;

  • 作者单位

    Michigan State Univ Dept Computat Math Sci &

    Engn E Lansing MI 48824 USA;

    Michigan State Univ Dept Elect &

    Comp Engn E Lansing MI 48824 USA;

    Michigan State Univ Dept Computat Math Sci &

    Engn E Lansing MI 48824 USA;

    Michigan State Univ Dept Computat Math Sci &

    Engn E Lansing MI 48824 USA;

    Tsinghua Univ Dept Elect Engn Beijing 10084 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 等离子体物理学;
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