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Line shapes in turbulent plasmas

机译:湍流等离子体中的线形状

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摘要

The fluctuations and oscillations observed in turbulent plasmas may affect the line shapes emitted by atoms and ions. We investigate several plasma conditions for which a spectroscopic signature of plasma turbulence can be observed. Starting from the simple model of microturbulence for Doppler profile, we examine how information on turbulent fluctuations is obtained in astrophysics and magnetic fusion plasmas. We recall the potential of a formalism which expresses the measured line shape in function of the probability density function of the fluctuating plasma parameters. New calculations of hydrogen dipole autocorrelation functions and line shapes are presented for plasmas affected by strong Langmuir turbulence and nonlinear wave collapse. We propose a model using a sequence of envelope solitons for the electric field created by the wave packets and felt by the emitters, and show that the line shape may be dominated by the effect of strong Langmuir turbulence.
机译:在湍流等离子体中观察到的波动和振荡可能影响原子和离子发出的线形状。 我们研究了几种等离子体条件,可以观察到血浆湍流的光谱特征。 从微旋转的简单模型开始,我们研究了在天体物理学和磁融合等离子体中获得了有关湍流波动的信息。 我们记得形式主义的潜力,其表示具有波动等离子体参数的概率密度函数的功能的测量线形状。 通过强大的Langmuir湍流和非线性波塌陷影响的等离子体,提出了新的氢偶极自相关函数和线形状的新计算。 我们提出了一种模型,使用由波包产生的电场的一系列包络孤子,并由发射器感到毛毡,并表明线形状可以由强朗米尔湍流的影响主导。

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