摘要
利用矢量网络分析仪,对频域9—11GHz的电磁脉冲在实验室稳态无磁场等离子体中传播时间的问题进行了实验研究.实验发现当等离子体密度在0.65—1.43×1011cm-3范围内时,电磁脉冲通过该等离子体传播的时间将会小于该电磁脉冲在真空中传播同样距离所需要的时间,在密度约为1.10×1011cm-3时,这两个时间差会出现一个极值.进一步的研究表明在此密度范围内,非磁化Xe等离子体中的电磁波色散关系将不再成立.
The propagation time of electromagnetic pulse(EMP) through nonmagnetic stationary laboratory Xe plasma was investigated by using network analyzer, with EMP frequency of 9- 11 GHz. The research indicates that the propagation time of EMP through plasma will be less than that through the same distance in vacuum when the plasma density is in the range of 0.65-1.43 × 10^11 cm^-3 ,and the time delay will be a minimum at ne ≈ 1.10 ≈ 10^11 cm^-3 . In this range of plasma density, the dispersion relation of electromagnetic wave in Xe plasma without magnetic field will be invalid.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第3期1429-1433,共5页
Acta Physica Sinica
关键词
电磁脉冲
脉冲传播时间
等离子体密度
色散关系
electromagnetic pulse, propagation time of pulse, plasma density, dispersion relation