Study on Townsend first ionization coefficient in a streamer filament of the pulsed electric discharge in water

汤森排放 电离 蛋白质丝 原子物理学 物理 阳极 汤森 材料科学 离子 电极 量子力学 复合材料
作者
Yuantian Yang,Xiao Qiong Wen,Liru Wang,Xue Wang
出处
期刊:Physics of Plasmas [American Institute of Physics]
卷期号:29 (9) 被引量:2
标识
DOI:10.1063/5.0099396
摘要

Streamers in water usually consist of several weakly ionized gaseous filaments. It is important to understand the ionization and excitation processes occurring in a streamer filament. In this paper, we studied the Townsend first ionization coefficient α in a streamer filament. The emission images of streamers in water were acquired by using an ultra-high speed camera system. Based on the emission images, it was found that the luminance of a streamer filament decreased exponentially as the distance increased from the anode tip. The Townsend first ionization coefficient in the streamer filament in water was then estimated by the emission profile method. It was found that the Townsend first ionization coefficient in a streamer filament was 5.3 cm−1 on average and did not depend on the water conductivity or the applied voltage of interest in the present paper. The Townsend first ionization coefficient estimated by the emission profile method is in agreement with that deduced from the electron density profile of the streamer filament in water, indicating that the emission profile method for measuring the Townsend first ionization coefficient can be applicable to the streamers in water. We also estimated the reduced Townsend first ionization coefficient α/N in a streamer filament in water and found that the obtained value for α/N was four orders of magnitude lower than those obtained from the glow discharge in low pressure water vapor, but at least ten orders of magnitude greater than those predicted by the empirical formulas.
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