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Tokamak turbulence computations on closed and open magnetic flux surfaces

机译：封闭和开放磁通面上的托卡马克湍流计算

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We study turbulence on closed and open flux surfaces in a comparative manner using the three-dimensional electromagnetic gyrofluid turbulence code GEM. A magnetic field on a tokamak is doubly periodic and sheared. This leads to the so-called field line connection, which ensures a finite parallel response for every degree of freedom. In contrast, in the scrape-off layer (SOL), the field lines end on plates, breaking this constraint and allowing the existence of convective cell modes. Since the parallel electron response provides a path to dissipation, whether or not it is allowed to vanish is important. For the SOL case, a standard Debye sheath model is used to provide the parallel boundary conditions. A zero loss model (no fluxes into the plates) is also used to assess the importance of the Debye currents. Turbulence on closed and open flux surfaces at the same parameters is found to be very different, a property which basic transport models should take into account.
机译：我们使用三维电磁旋流湍流代码GEM，以比较的方式研究了封闭和开放通量表面上的湍流。托卡马克上的磁场是双重周期性的并且被剪切。这导致了所谓的磁力线连接，从而确保了每个自由度的有限并行响应。相反，在刮除层（SOL）中，磁力线终止于极板上，打破了这种限制，并允许存在对流单元模式。由于平行电子响应提供了一条耗散路径，因此是否允许其消失很重要。对于SOL情况，使用标准的Debye护套模型来提供平行边界条件。零损耗模型（无助焊剂流入极板）也用于评估德拜电流的重要性。发现在相同参数的封闭和开放通量表面上的湍流截然不同，这是基本传输模型应考虑的特性。

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