Effect of surface protrusion on plasma sheath properties in atmospheric microdischarges

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

doi:10.1063/1.5011768

Title: Effect of surface protrusion on plasma sheath properties in atmospheric microdischarges

Journal Article · 29 January 2018 · Physics of Plasmas

DOI: https://doi.org/10.1063/1.5011768 · OSTI ID:1514893

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^[1]; Christlieb, Andrew J. ^[3]; Wang, Xinxin ^[4]

Michigan State Univ., East Lansing, MI (United States). Dept. of Computational Mathematics, Science and Engineering; Michigan State Univ., East Lansing, MI (United States). Dept. of Electrical and Computer Engineering
Michigan State Univ., East Lansing, MI (United States). Dept. of Electrical and Computer Engineering
Michigan State Univ., East Lansing, MI (United States). Dept. of Computational Mathematics, Science and Engineering; Michigan State Univ., East Lansing, MI (United States). Dept. of Electrical and Computer Engineering, and Dept. of Mathematics
Tsinghua Univ., Beijing (China). Dept. of Electrical Engineering

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.

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Research Organization:: Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Natural Science Foundation of China (NSFC)

Grant/Contract Number:: SC0001939; FA9550-14-1-0309; FA9550-18-1-0061

OSTI ID:: 1514893

Alternate ID(s):: OSTI ID: 1418411

Journal Information:: Physics of Plasmas, Vol. 25, Issue 1; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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