Turbulent and neoclassical impurity transport in tokamak plasmas
Turbulent and neoclassical impurity transport in tokamak plasmas
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DOI：
10.1063/1.3083299
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发表时间：
2009-03
影响因子：
2.2
通讯作者：
T. Fülöp;H. Nordman
中科院分区：
文献类型：
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作者：
T. Fülöp;H. Nordman
在无碰撞极限和新经典理论下，利用静电流体模型研究了托卡马克中杂质粒子的输运，其中主要离子和杂质温度梯度（ITG）模式和捕获电子（TE）模式湍流。通过对杂质输运的自一致处理得到的杂质通量和杂质密度峰值因子与常用的微量杂质近似的结果进行了比较和对比。比较痕量和自洽湍流杂质输运进行了iter类剖面。结果表明，对于小杂质浓度，如果等离子体主要受ITG湍流控制，则微量杂质限值是足够的。然而，在TE模式占主导的等离子体的情况下，杂质模式的贡献可能是显著的，因此可能需要自洽处理。
Impurity particle transport in tokamaks is studied using an electrostatic fluid model for main ion and impurity temperature gradient (ITG) mode and trapped electron (TE) mode turbulence in the collisionless limit and neoclassical theory. The impurity flux and impurity density peaking factor obtained from a self-consistent treatment of impurity transport are compared and contrasted with the results of the often used trace impurity approximation. Comparisons between trace and self-consistent turbulent impurity transport are performed for ITER-like profiles. It is shown that for small impurity concentrations the trace impurity limit is adequate if the plasma is dominated by ITG turbulence. However, in case of TE mode dominated plasmas the contribution from impurity modes may be significant, and therefore a self-consistent treatment may be needed.