The reflection of an electromagnetic wave from the self-produced plasma

被引:9
作者
Mirzaie, M. [1 ]
Shokri, B. [1 ,2 ]
Rukhadze, A. A. [3 ]
机构
[1] Shahid Beheshti Univ, Dept Phys, Tehran 1983963113, Iran
[2] Shahid Beheshti Univ, Laser Plasma Res Inst, Tehran 1983963113, Iran
[3] Russian Acad Sci, Inst Gen Phys, Moscow, Russia
关键词
electromagnetic wave reflection; ionisation; plasma density; plasma electromagnetic wave propagation; wave equations; MICROWAVE REFLECTOMETRY; GAS; IONIZATION; INSTABILITIES; GENERATION;
D O I
10.1063/1.3292654
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
The dynamic behavior of a high power microwave beam propagating through a gaseous medium, which is ionized in the wave field is investigated. By solving the wave equation, the reflection index of the produced plasma is obtained. It is shown that the cut off condition is different from that of the steady state approximation. The reflection index is less than unity when the plasma density reaches the critical value estimated in the steady state approximation. So, the wave can still propagate through the plasma. By comparing the reflection indexes in the presence and absence of the time delay of the ionization process at different points of the medium, it is shown that it becomes unity much later in the first case. Therefore, the wave propagation takes much more time and consequently the medium is ionized much more.
引用
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页数:6
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