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arXiv physics/0412091physics.plasm-phphysics.atom-ph
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低频湍流托卡马克等离子体中的谱线形状

Spectral line shapes in low frequency turbulent tokamak plasmas

Y. Marandet, H. Capes, L. Godbert-Mouret, M. Koubiti, R. Stamm

摘要:

本文研究了低频湍流对磁化等离子体多普勒谱线形状的影响。低频在这里指的是波动,其典型的时间尺度远远大于那些表征原子过程,如辐射衰变,碰撞和电荷交换。这种排序是特别相关的漂移波湍流,无处不在的边缘等离子体的融合设备。湍流的波动被发现通过测量过程中引入的空间和时间平均值来影响线条形状。的轮廓表示在描述等离子体的流体场。假设光谱仪的采集时间要比湍流时间尺度大得多,在实验中通常实现的排序,允许开发统计形式主义。我们继续调查的密度,流体速度和温度波动的影响,单独的多普勒分布的谱线发射的电荷交换人口的中性。线翼被发现受到离子温度或流体速度波动的影响,并且在某些情况下可以表现出幂律行为。这项研究提供了一些见解的外观非玻尔兹曼统计,如Levy统计,当处理平均实验数据。

英文摘要:

In this paper we investigate the influence of low frequency turbulence on Doppler spectral line shapes in magnetized plasmas. Low frequency refers here to fluctuations whose typical time scale is much larger than those characterizing the atomic processes, such as radiative decay, collisions and charge exchange. This ordering is in particular relevant for drift wave turbulence, ubiquitous in edge plasmas of fusion devices. Turbulent fluctuations are found to affect line shapes through both the spatial and time averages introduced by the measurement process. The profile is expressed in terms of the fluid fields describing the plasma. Assuming the spectrometer acquisition time to be much larger than the turbulent time scale, an ordering generally fulfilled in experiments, allows to develop a statistical formalism. We proceed by investigating the effects of density, fluid velocity and temperature fluctuations alone on the Doppler profile of a spectral line emitted by a charge exchange population of neutrals. Line wings are found to be affected by ion temperature or fluid velocity fluctuations, and can in some cases exhibit a power-law behavior. This study gives some insights in the appearance of non-Boltzmann statistics, such as Levy statistics, when dealing with averaged experimental data.

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