Abstract

The results of studying the initial phase of a spark discharge microstructure formation in a tip–plane gap 1.5 mm length in air are presented. Measurements show that, within 15 ns after breakdown, the channel is an aggregate of a large number of microchannels, the current in the channel rises almost linearly to a value of 1 kA, and the electron density reaches 2 × 10¹⁹ cm^–3. Calculations of the kinetics of processes in a separate microchannel taking into account experimental data have been carried out. It has been found that the average electron temperature ranges from 4 to 8 eV, the electric field strength is ~ 300 kV/cm, and electrical conductivity is ~10 Ω^–1 cm^–1. The results obtained show that it is the discharge microstructure that causes relatively high values of the average electron temperature along with a sufficiently high ionization degree.

中文翻译：

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大气压空气中尖端平面间隙火花放电初始阶段的微通道结构参数

摘要

给出了研究在空气中1.5毫米长的尖端平面间隙中火花放电微观结构形成的初始阶段的结果。测量表明，击穿后15 ns内，该通道是大量微通道的集合体，通道中的电流几乎呈线性上升至1 kA的值，并且电子密度达到2×10 ¹⁹ cm ^-3。考虑到实验数据，已经进行了在单独的微通道中的过程动力学的计算。已经发现，平均电子温度范围为4至8 eV，电场强度为〜300 kV / cm，电导率为〜10Ω ^–1  cm ^–1。所获得的结果表明，是放电微结构引起相对高的平均电子温度值以及足够高的电离度。