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Neoclassical transport of heavy impurities with poloidally asymmetric density distribution in tokamaks

机译:托卡马克中重金属杂质的新古典传输,其极化分布不对称

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摘要

Heavy impurity ions in tokamaks are not always evenly distributed over flux surfaces. For instance, toroidal plasma rotation can give rise to a centrifugal force large enough to push impurities to the outboard side of the torus, or ion-cyclotron resonance heating of minority ions can cause inboard impurity localization. It is shown that such poloidally uneven distribution of the impurity ions can enhance or reduce their neoclassical transport by one to two orders of magnitude, or even reverse the direction of the neoclassical impurity convection, depending on the level of poloidal asymmetry of the impurity density distribution and on the ratio of the logarithmic ion temperature gradient to the logarithmic density gradient.
机译:托卡马克中的重杂质离子并不总是均匀地分布在助焊剂表面上。例如,环形等离子体旋转会产生足够大的离心力,以将杂质推到圆环的外侧,或者少数离子的离子回旋共振加热会导致内侧杂质定位。结果表明,取决于杂质密度分布的倍体不对称程度,杂质离子的这种倍体不均匀分布可以将其新古典输运提高或降低一到两个数量级,甚至可以逆转新古典对流的方向。以及对数离子温度梯度与对数密度梯度之比。

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