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

Plasma Science and Technology 2023年第1期25卷 43-52页

作者：李旭晋绍珲宋珂聂兰兰刘大伟卢新培 State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China Center of Stomatology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030People's Republic of China School of Stomatology Tongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030People's Republic of China

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).

关键词： atmospheric pressure plasma jet electric field electric field induced second harmonic

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