等离子体填充圆柱波导中双流不稳定性的研究

Theoretical study on two beams interactions in cylindrical waveguide filled with plasma

在无限大磁场情况下对等离子体填充圆柱波导中双电子注的相互作用进行了理论分析,得出行列式形式的色散方程。针对不同参数对色散方程进行数值计算,发现当两根电子注之间存在速度差时,通过快慢空间电荷波的相互作用,两电子注引起的双流不稳定性可以产生契伦柯夫辐射;当等离子体频率超过双注相互作用的频率范围后,可以大大加强和改善等离子体、两电子注三者之间的相互作用。

The interaction of two electron beams in a cylindrical waveguide filled with plasma is studied in this paper. The linear theory is established based on a fluid model. The numerical results show the two-stream instability of two electron beams can produce Cherenkov radiation through the interaction between the fast space charge wave and the slow space charge wave, and the frequency of radiation can be above the plasma frequency. When the plasma frequency exceeds the frequency scope of the interaction, the interactions of beam-plasma and beam-beam can be improved and enhanced greatly.