脉冲等离子体辐射微波机理的初步研究  

Preliminary study on mechanism of radiating microwave from pulsed plasma

作　　者：陈仕修[1] 孙幼林[2] 夏长征[1] 严国志[1] 

机构地区：[1]武汉大学电气工程学院,武汉430072 [2]武汉大学物理科学与技术学院,武汉430072

出　　处：《强激光与粒子束》2008年第3期477-481,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金资助课题(50377029)

摘　　要：在分析了等离子体辐射微波的电流波形和喇叭天线接收到的微波信号波形的基础上,对脉冲等离子体辐射微波的机理进行了理论分析:阴阳极间存在TEM和TM两种模式的波;流经等离子体的电流产生的磁场使等离子体中的波成为慢波;高频场的激励因素有两个,一是作加速运动的电子,二是阳极斑点溅射时阳极电位突降;同一时刻具有不同速度的电子将能量转换给相应相速的波是其产生超宽带辐射的原因。Ultra broadband radiation（UWB） performance of microwave radiated from plasma is introduced by this paper. Based on analysis of both current waveform and microwave signal waveform received by horn antenna, some factors referring to radiation mechanism are analyzed：there are TEM and TM modals of electromagnetic waves between cathode and anode; magnetic field excited by current flowing through the plasma itself makes the waves in plasma slow waves;there are two exciting factors, one is the electrons moving with acceleration, and the other is abruptly fall of anode voltage the caused by anode spots spray. The reason of broadband radiation is that the electrons with different velocities transfer energy to the waves of corresponding phase velocity.

关 键 词：脉冲等离子体 超宽带辐射 微波 辐射机理 

分 类 号：O46[理学—电子物理学] O539[理学—物理]