arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0901.3883physics.plasm-phphysics.atom-ph
收藏

等离子体中Laser共振吸收的半解析模型

Semi-analytical Model of Laser Resonance Absorption in Plasmas

S J Pestehe, M Mohammadnejad

摘要:

当电磁波斜入射到非均匀高密度等离子体上时,只要电磁波在入射面内极化,并具有沿等离子体电子密度梯度的电场分量,就会被共振吸收。该过程通过线性模式转换成电子等离子体波而发生。本文研究了具有线性电子密度分布的等离子体在临界密度附近对激光的共振吸收。本文采用一种新的半解析模型,用麦克斯韦方程组计算了激光在非均匀等离子体中传播的电磁矢量。然后,评估激光能量的吸收分数,并绘制相对于入射角的曲线。结果表明,该模型可以解释以往的经典近似结果在高密度尺度长度以及报道的数值结果在几乎所有的密度尺度长度。

英文摘要:

When an electromagnetic wave is obliquely incident on an inhomogeneous high density plasma, it will be absorbed resonantly as long as it is polarized in the plane of incidence and has an electric field component along the plasma electron density gradient. This process takes place by linear mode conversion into an electron plasma wave. In this paper, we have considered the resonant absorption of laser light near the critical density of a plasma with linear electron density profile. The behaviour of the electric and magnetic vectors of a laser light propagating through inhomogeneous plasma has been studied by calculating them using Maxwell's equations using a new semi-analytical model. The absorbed fraction of the laser light energy, then, evaluated and plotted versus the angle of incidence. It has been shown that this new model can explain the previous classical approximated results at high density scale lengths as well as the reported numerical results in almost all density scale lengths.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑