Determination of diffusive and nondiffusive transport in modulation experiments in plasmas
Determination of diffusive and nondiffusive transport in modulation experiments in plasmas
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DOI：
10.1063/1.859781
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发表时间：
1991-11
期刊：
影响因子：
--
通讯作者：
A. Jacchia;P. Mantica;F. Luca;G. Gorini
中科院分区：
文献类型：
--
作者：
A. Jacchia;P. Mantica;F. Luca;G. Gorini
讨论了具有扩散和非扩散能量输运的等离子体中谐波温度扰动的传播问题。的能量通量是由两个（径向变化）的扩散和非扩散运输的有效系数建模，并考虑到扰动的能量汇和圆柱形几何形状的影响。一个简单的，本地的关系被发现之间的两个输运系数和温度扰动的相位和幅度的梯度。这种关系可用于解释加热调制实验，提供不同调制频率下的数据。由于等离子体中的谐波密度扰动遵循类似的线性输运方程，因此类似的模型也可以应用于密度调制实验。
The problem of the propagation of a harmonic temperature perturbation in a plasma with both diffusive and nondiffusive energy transport is addressed. The energy flux is modeled by two (radially varying) effective coefficients for the diffusive and nondiffusive transport, and the effects of perturbed energy sinks and of cylindrical geometry are taken into account. A simple, local relationship is found between the two transport coefficients and the gradients of the phase and amplitude of the temperature perturbation. This relationship can be used for the interpretation of heating modulation experiments, provided data at different modulation frequencies are available. Since a harmonic density perturbation in a plasma follows a similar linearized transport equation, a similar model can be applied also to density modulation experiments.