碰撞频率对等离子体吸波特性的影响

Impacts of Collision Frequency on Ability of Plasma to Absorb the Electromagnetic Wave

电子碰撞频率对等离子体与电磁波相互作用的性质具有较大影响。本文分别采用单粒子模型和考虑电子的集体效应,研究了碰撞频率对磁化等离子体吸收电磁波能力的影响。结果表明,无论考虑集体效应与否,碰撞频率的提高均有利于展宽等离子体对电磁波的吸收带宽,但却会降低吸收的峰值,存在一个最佳的碰撞频率,可使等离子体对电磁波的吸收在一个波段达到最强。最后,给出了非磁化等离子体的最佳碰撞频率。

The electron collision frequency plays an important role in the interaction of the plasma and electromagnetic waves. In this paper, influences of electron collision frequencies of magnetized plasmas on their abilities to absorb electromagnetic waves are studied, with the model of single particle and considering the collective effect, respectively. Results show that, whether or not the collective effect is taken into account, to increase the electron collision frequencies will broaden the bandwidth of plasmas to absorb electromagnetic waves, but will reduce the absorbing peak value. Moreover, there is an optimal electron collision frequency making the absorption of the plasma to electromagnetic waves the strongest in a band. Finally, the optimal electron collision frequency of the non-magnetized plasma is oresented.