It is suggested that the instability is excited in the lowdensity plasma when the electron beam drift velocities exceed the ion acoustic speed.
不稳定性产生的可能机制是由于电子束穿过低密度本底等离子体的漂移速度超过离子声速而激发起来的。
2
The thermodynamic failure of the structures irradiated by laser beam with low power density are studied in this paper.
研究了低功率密度激光辐照结构的热动力失效。
3
The absorption characteristics of eight kinds of powder layers coated on common metals have been investigated using CO_2 laser beam with low and high power density.