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Statistical study of density fluctuations in the Tore Supra tokamak

机译：Tore Supra托卡马克中密度波动的统计研究

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It is believed that radial anomalous transport in tokamaks is caused by plasma turbulence. Using infra-red laser scattering techniques on the Tore Supra tokamak, statistical properties of the density fluctuations are studied as a function of the scales in ohmic as well as additional heating regimes using the lower hybrid or the ion cyclotron frequencies. The probability distributions are compared to a Gaussian in order to estimate the role of intermittency which is found to be negligible. The temporal behaviour of the three-dimensional spectrum is thoroughly discussed; its multifractal character is reflected in the singularity spectrum. The autocorrelation coefficient is shown to reflect a short-time coherence of the dissipative structures as well as their long-time incoherence and statistical independence. We also put forward the existence of fluctuations transfer between two distinct but close wavenumbers. A rather clearer image is thus obtained about the way energy is transferred through the turbulent scales. [References: 28]
机译：据信，托卡马克中的径向异常运输是由等离子体湍流引起的。在Tore Supra托卡马克上使用红外激光散射技术，研究了密度波动的统计特性，该特性是欧姆尺度的函数以及使用较低混合动力或离子回旋加速器频率的其他加热方式的函数。将概率分布与高斯进行比较，以估计被认为是可以忽略的间歇性的作用。全面讨论了三维频谱的时间行为。它的多重分形特征反映在奇异谱中。自相关系数显示出可反映耗散结构的短期相干性以及它们的长期不相干性和统计独立性。我们还提出了在两个不同但接近的波数之间存在波动传递的问题。这样就获得了关于通过湍流标尺传递能量的方式的更清晰的图像。 [参考：28]

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