Ionization process and distinctive characteristic of atmospheric pressure cold plasma jet driven resonantly by microwave pulses  

作　　者：Lingli HONG Zhaoquan CHEN Jie YANG Tao CHENG Sile CHEN Yuming ZHOU Bing WANG Xinpei LU 洪伶俐;陈兆权;杨洁;程涛;陈思乐;周郁明;王兵;卢新培(Anhui Province Key Laboratory of Power Electronics and Electrical Control,Anhui University of Technology,Maanshan 243032,People's Republic of China;State Key Laboratory of Advanced Electromagnetic Engineering and Technology,Huazhong University of Science and Technology,Wuhan 430074,People's Republic of China)

机构地区：[1]Anhui Province Key Laboratory of Power Electronics and Electrical Control,Anhui University of Technology,Maanshan 243032,People's Republic of China [2]State Key Laboratory of Advanced Electromagnetic Engineering and Technology,Huazhong University of Science and Technology,Wuhan 430074,People's Republic of China

出　　处：《Plasma Science and Technology》2022年第10期45-53,共9页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China (Nos. 52177126 and 11575003);Anhui Province University Excellent Youth Foundation (No. gxyqzd2021104)

摘　　要：In the present study,a coaxial transmission line resonator is constructed,which is always capable of generating cold microwave plasma jet plumes in ambient air in spite of using argon,nitrogen,or even air,respectively.Although the different kinds of working gas induce the different discharge performance,their ionization processes all indicate that the ionization enhancement has taken place twice in each pulsed periods,and the electron densities measured by the method of microwave Rayleigh scattering are higher than the amplitude order of 10^(18)m^(-3).The tail region of plasma jets all contain a large number of active particles,like NO,O,emitted photons,etc,but without O_(3).The formation mechanism and the distinctive characteristics are attributed to the resonance excitation of the locally enhanced electric fields,the ionization wave propulsion,and the temporal and spatial distribution of different particles in the pulsed microwave plasma jets.The parameters of plasma jet could be modulated by adjusting microwave power,modulation pulse parameters(modulation frequency and duty ratio),gas type and its flow rate,according to the requirements of application scenarios.

关 键 词：pulsed microwave discharge cold plasma jet transient ionization process ionization enhancement 

分 类 号：O53[理学—等离子体物理]