Electron characteristics and dynamics in sub-millimeter pulsed atmospheric dielectric barrier discharge

doi:10.1088/1674-1056/ad0118

Abstract The discharge characteristics and mechanism of sub-millimeter pulsed dielectric barrier discharge in atmospheric-pressure helium are investigated experimentally and theoretically, demonstrating that when the discharge gap distance is reduced from 1.00 mm to 0.20 mm, the discharge ignition time is reduced to approximately 40 ns and discharge intensity is enhanced in terms of the discharge optical emission intensity and density of the plasma species, (energetic electrons with energy above 8.40 eV). The simulated results show that as the discharge gap distance is further reduced to 0.10 mm, the number of energetic electrons decreases, which is attributable to the contraction of plasma bulk regime and reduction of electron density in the discharge bulk. Conversely, the proportion of energetic electrons to the total electrons in the discharge monotonically increases as the discharge gap distance is reduced from 1.00 mm to 0.10 mm. It is proposed that a gap distance of 0.12 mm is optimal to achieve a high concentration and proportion of energetic electrons in sub-millimeter pulsed atmosphere dielectric barrier discharge.

Keywords: sub-millimeter pulsed discharge plasma simulation electron dynamics and sheath

Received: 02 August 2023
Revised: 18 September 2023
Accepted manuscript online: 07 October 2023

PACS:	52.20.-j	(Elementary processes in plasmas)
	52.25.-b	(Plasma properties)
	52.40.Kh	(Plasma sheaths)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12175036 and 11875104).

Corresponding Authors: Ying Guo, Jianjun Shi
E-mail: guoying@dhu.edu.cn;jianjunshi@gmail.com

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Junlin Fang(方骏林), Yarong Zhang(张亚容), Chenzi Lu(卢陈梓), Lili Gu(顾莉莉), Shaofeng Xu(徐少锋), Ying Guo(郭颖), and Jianjun Shi(石建军) Electron characteristics and dynamics in sub-millimeter pulsed atmospheric dielectric barrier discharge 2024 Chin. Phys. B 33 015201

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