Temporal electric field of a helium plasma jet by electric field induced second harmonic(E-FISH)method

作     者：李旭 晋绍珲 宋珂 聂兰兰 刘大伟 卢新培 Xu LI;Shaohui JIN;Ke SONG;Lanlan NIE;Dawei LIU;Xinpei LU

作者机构：State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China Center of StomatologyTongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030People's Republic of China School of StomatologyTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030People's Republic of China 

出 版 物：《Plasma Science and Technology》 (等离子体科学和技术（英文版）)

年 卷 期：2023年第25卷第1期

页      面：43-52页

核心收录：

学科分类：07[理学] 070204[理学-等离子体物理] 0702[理学-物理学] 

基　　金：National Key Research and Development Program of China(No.2021YFE0114700) National Natural Science Foundation of China(Nos.52130701 and 51977096) 

主　　题：atmospheric pressure plasma jet electric field electric field induced second harmonic 

摘      要：Electric field is an important parameter of plasma,which is related to electron temperature,electron density,excited species density,and so *** this work,the electric field of an atmospheric pressure plasma jet is diagnosed by the electric field induced second harmonic(E-FISH)method,and the time-resolved electric field under different conditions is *** positive pulse voltage is applied,the electric field has a peak of about 25 kV cm-1at the rising edge of the voltage pulse.A dark channel is left behind the plasma bullet and the electric field in the dark channel is about 5 kV *** the other hand,when negative pulse voltage is applied,the electric field has a peak of-16 kV cm-1when the negative voltage is increased to-8 kV.A relatively bright channel is left behind the plasma head and the electric field in this relatively bright channel is about-6 kV *** the pulse rising time increases from 60 to 200 ns,the peak electric field at both the rising edge and the falling edge of the voltage decreases *** 0.5%of oxygen is added to the main working gas helium,the peak electric field at the rising edge is only about 15 kV *** the other hand,when 0.5%nitrogen is added,the peak electric field increases especially at the falling edge of the voltage pulse,where it increases reversely from-12 to-16 kV cm-1(the minus sign only represents the direction of electric field).