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A possible mechanism responsible for generating impurity outward flow under radio frequency heating

机译：射频加热下可能产生杂质向外流动的可能机制

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摘要

The effect of poloidal asymmetry of impurities on impurity transport driven by electrostatic turbulence in tokamak plasmas is analyzed. It is found that in the presence of in-out asymmetric impurity populations the zero-flux impurity density gradient (the so-called peaking factor) is significantly reduced. A sign change in the impurity flux may occur if the asymmetry is sufficiently large. This may be a contributing reason for the observed outward convection of impurities in the presence of radio frequency heating. This paper extends a previous work (Fül?p and Moradi 2011 Phys. Plasmas 18 030703), by including the effect of ion parallel compressibility on the peaking factor, which is found to have a significant contribution in the presence of poloidal asymmetry. It is shown here that in the ion temperature gradient mode dominated plasmas the presence of an in-out poloidal asymmetry can lead to a negative impurity peaking factor, and it becomes more negative in regions with larger ion temperature gradients. In the trapped electron mode dominated plasmas an in-out poloidal asymmetry results in a strong reduction of the peaking factor; however, it remains positive for typical experimental parameters. Furthermore, it is shown that an up-down asymmetry reduces the peaking factor while an out-in asymmetry increases it.
机译：分析了托卡马克等离子体中杂质的极性不对称性对静电湍流驱动的杂质迁移的影响。发现在存在不对称内杂质的情况下，零通量杂质密度梯度（所谓的峰值因数）显着降低。如果不对称度足够大，则杂质通量可能会发生符号变化。这可能是在存在射频加热的情况下观察到的杂质向外对流的原因。本文扩展了先前的工作（Fül？p和Moradi 2011 Phys.Plasmas 18 030703），包括离子平行可压缩性对峰化因子的影响，发现它在存在多倍体不对称性方面具有重要作用。此处显示出，在离子温度梯度模式主导的等离子体中，存在进-出极性不对称性会导致负的杂质峰化因子，并且在具有较大离子温度梯度的区域中，该峰会变得更加负。在俘获的电子模式占优势的等离子体中，进出极向不对称性会导致峰化因子大大降低。但是，对于典型的实验参数，它仍然是积极的。此外，还显示了上下不对称性会降低峰化因子，而外进不对称性会增加峰化因子。

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