In this work we study the undesired effects of electron density fluctuations (in the form of blob structures which may exist in the edge region of tokamak plasmas) to the electron-cyclotron wave propagation and current drive in connection to the efficiency of neoclassical tearing mode stabilization. Our model involves the evaluation of the driven current in the presence of density perturbations, by using a combination of a wave solver based on the transfer matrix and electromagnetic homogenization methods for the propagation part prior to and inside the region of these structures (where standard asymptotic propagation methods may not be valid due to the short-wavelength limit breakdown), with a ray tracing code including island geometry effects and current drive computation for the propagation past the perturbed region. The computed driven current is input into the modified Rutherford equation in order to estimate the consequences of the wave deformation (driven by the density fluctuations) to the mode stabilization.

中文翻译：

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边缘密度波动对用于新古典撕裂模式稳定的电子回旋电流驱动的建模效果

在这项工作中，我们研究了电子密度波动（以可能存在于托卡马克等离子体边缘区域的斑点结构的形式）对电子回旋波传播和电流驱动的不良影响，以及新古典撕裂模式稳定的效率。 . 我们的模型涉及在存在密度扰动的情况下评估驱动电流，方法是结合使用基于传递矩阵的波求解器和这些结构区域之前和内部的传播部分的电磁均匀化方法（其中标准渐近由于短波长限制击穿，传播方法可能无效），射线追踪代码包括岛几何效应和通过扰动区域传播的电流驱动计算。