Isotopic dependence of impurity transport driven by ion temperature gradient turbulence

Isotopic dependence of impurity transport driven by ion temperature gradient turbulence
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离子温度梯度湍流驱动的杂质输运的同位素依赖性

DOI:
10.1063/1.4966561
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发表时间:
2016-10
期刊:
影响因子:
2.2
通讯作者:
Zhuang, Ge
Zhuang, Ge
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Guo, Weixin;Wang, Lu;Zhuang, Ge

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用回旋动力学理论研究了离子温度梯度(ITG)湍流驱动的类氢离子质量效应,即同位素对杂质输运的影响。对于非痕量杂质,从氢(H)到氚(D)和氚(T)等离子体,低(高)电离杂质或轻(重)杂质的向外通量被发现减小(增加),尽管ITG线增长率的同位素依赖性很弱。这主要是由于向外(向内)对流的减少,而扩散的同位素依赖性相对较弱。此外,由于弱(强)磁剪切,同位素效应降低(增强)了全电离碳(C6+)的杂质通量。在微量杂质限度内,同位素效应减少了高Z钨(W)的积累。此外,随着磁剪切力的增强,同位素对痕量高Z-W峰化因子的影响也越来越大。
Hydrogenic ion mass effects, namely, the isotopic effects on impurity transport driven by ion temperature gradient (ITG) turbulence are investigated using gyrokinetic theory. For non-trace impurities, changing from hydrogen (H) to deuterium (D), and to tritium (T) plasmas, the outward flux for lower (higher) ionized impurities or for lighter (heavier) impurities is found to decrease (increase), although isotopic dependence of the ITG linear growth rate is weak. This is mainly due to the decrease of outward (inward) convection, while the isotopic dependence of diffusion is relatively weak. In addition, the isotopic effects reduce (enhance) the impurity flux of fully ionized carbon (C6+) for weaker (stronger) magnetic shear. In the trace impurity limit, the isotopic effects are found to reduce the accumulation of high-Z tungsten (W). Moreover, the isotopic effects on the peaking factor of trace high-Z W get stronger with stronger magnetic shear.
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