Features of the Structure of Spark Channels in a Near-Cathode Region

IF 1.4 4区 物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY JETP Letters Pub Date : 2024-11-12 DOI:10.1134/S0021364024602951
E. V. Parkevich
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Abstract

Features of the generation of a highly ionized plasma from a tip cathode after the electrical breakdown of a millimeter air discharge gap at atmospheric pressure have been studied using picosecond laser probing at a wavelength of 532 nm. It has been found that the transformation of a micron-sized cathode spot to a growing spark channel is accompanied by the formation of a spherical plasma region in the base of the spark channel in the near-cathode region. The electron density in this region, which is about 100 μm in diameter, decreases to 3 × 1019 cm–3 in the center and increases to (5–6) × 1019 cm–3 in its shell with a thickness of about 20 μm. It has been shown that the growth of the subsequent spark channel is governed by a strong ionization front formed at the boundary of the expanding spherical plasma region in 1 ns after the gap breakdown. It has been assumed that the formation of the spherical plasma region in the near-cathode region affects the subsequent development of the microstructure of the electric spark.

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近阴极区火花通道结构的特点
我们利用波长为 532 纳米的皮秒激光探测技术,研究了在大气压力下毫米空气放电间隙发生电击穿后从尖端阴极产生高电离等离子体的特征。研究发现,在微米大小的阴极点转变为不断增长的火花通道的过程中,在近阴极区域的火花通道底部会形成一个球形等离子体区域。该区域的电子密度直径约为 100 μm,中心电子密度降至 3 × 1019 cm-3,外壳电子密度增至 (5-6) × 1019 cm-3,厚度约为 20 μm。研究表明,在间隙击穿后的 1 ns 内,在不断扩大的球形等离子体区域的边界上形成的强电离前沿决定了后续火花通道的增长。据推测,近阴极区球形等离子体区的形成会影响电火花微观结构的后续发展。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
JETP Letters
JETP Letters 物理-物理:综合
CiteScore
2.40
自引率
30.80%
发文量
164
审稿时长
3-6 weeks
期刊介绍: All topics of experimental and theoretical physics including gravitation, field theory, elementary particles and nuclei, plasma, nonlinear phenomena, condensed matter, superconductivity, superfluidity, lasers, and surfaces.
期刊最新文献
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