一种准光反射聚焦微波放电大气等离子体装置
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摘要
设计了一种准光反射聚焦方式的微波放电大气等离子体实验装置,装置包括大气环境模拟室和微波辐射聚焦系统。辐射微波在腔室中心形成kV/cm量级的非均匀强场,击穿大气产生等离子体。通过仿真计算了腔室内的空间辐射场分布,并利用小信号传递的方式进行测量,测量结果与仿真相符,形成的等离子体形态与辐射场分布强弱一致。电磁场在聚焦区域形成驻波,等离子体出现明显分层现象。实验通过拍照记录了不同参数条件下的等离子体图样,等离子体形态随气压升高而收缩,放电区域受场强和气压共同影响。对实验结果进行分析,验证了该装置的能力。
Microwave discharge is a kind of non-polar mode,which may form plasma that has the characteristics of transient,low temperature,non-equilibrium and so on at atmospheric pressure.A microwave plasma experimental facility with quasi optical focusing reflector is introduced,including the atmospheric environment simulation chamber and microwave transmission focusing system.A non-uniform strong electric field of kV/cm magnitude formed by focusing microwave power in the chamber,with plasma motivated in the central region.The distribution of the electric field in the chamber is calculated and measured.The results are in good agreement.And the shape of the plasma is also consistent with the intensity of the electric field.The plasma images under different parameters were observed by the camera through the device.The capability of the device was verified,which laid a foundation for further study of microwave atmospheric breakdown.
Microwave discharge is a kind of non-polar mode,which may form plasma that has the characteristics of transient,low temperature,non-equilibrium and so on at atmospheric pressure.A microwave plasma experimental facility with quasi optical focusing reflector is introduced,including the atmospheric environment simulation chamber and microwave transmission focusing system.A non-uniform strong electric field of kV/cm magnitude formed by focusing microwave power in the chamber,with plasma motivated in the central region.The distribution of the electric field in the chamber is calculated and measured.The results are in good agreement.And the shape of the plasma is also consistent with the intensity of the electric field.The plasma images under different parameters were observed by the camera through the device.The capability of the device was verified,which laid a foundation for further study of microwave atmospheric breakdown.
引文
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[2]Andrei V G,Victor L G.Application of high-power microwaves[M].Artech House,1994.
[3]Yan Eryan,Qiu Feng,Yang Hao,et al.Research of HPM plasma breakdown characteristics[C]//APCPST2016.2016.
[4]刘繁,汪建华,王秋良,等.常压微波等离子体炬装置的模拟与设计[J].强激光与粒子束,2011,23(6):1504-1508.(Liu Fan,Wang Jianhua,Wang Qiuliang,et al.Numerical modeling and design of atmospheric pressure microwave plasma jet.High Power Laser and Particle Beams,2011,23(6):1504-1508)
[5]刘亮,张贵新,朱志杰,等.一种大气微波环形波导等离子体设备[J].强激光与粒子束,2007,19(7):1501-1506.(Liu Liang,Zhang Guixin,Zhu Zhijie,et al.Atmospheric pressure microwave plasma system with ring waveguide.High Power Laser and Particle Beams,2007,19(7):1501-1506)
[6]周传明,刘国治,刘永贵,等.高功率微波源[M].北京:原子能出版社,2007.(Zhou Chuanming,Liu Guozhi,Liu Yonggui,et al.High-power microwave sources.Beijing:Atomic Energy Press,2007)
[7]Woo W,DeGroot J S.Microwave absorption and plasma heating due to microwave breakdown in the atmosphere[J].Phys Fluids,1984,27(2):475-487.
[8]Vidmar R J.On the use of atmospheric pressure plasmas as electromagnetic reflectors and absorbers[J].IEEE Trans Plasma Sci,1990,18(4):733-741.
[9]邱风,闫二艳,孟凡宝,等.开放空间等离子体对微波传输影响的模拟研究[J].强激光与粒子束,2015,27:103234.(Qiu Feng,Yan Eryan,Meng Fanbao,et al.Simulation research on transmission of microwave by plasmas at open space.High Power Laser and Particle Beams,2015,27:103234)
[10]Zhou Qianhong,Dong Zhiwei.Theoretical study on the energy loss induced by electron collisions in weakly ionized air plasma[J].Acta Physica Sinica,2013,62:205201.
[11]Liao B,Zhang S J,Na Z,et al.Study on low-power microwave plasma source based on microstrip split-ring resonator[J].Journal of Shanghai Jiaotong University,2009,43(3):372-376.
[12]Qiu F,Yan E,Meng F,et al.Analysis based on global model of nitrogen plasma produced by pulsed microwave at low pressure[J].Physics of Plasmas,2015,22:073506.
[13]Yang W,Zhou Q,Dong Z.Simulation study on nitrogen vibrational and translational temperature in air breakdown plasma generated by110GHz focused microwave pulse[J].Physics of Plasmas,2017,24:013111.