Effect of neutral atoms on tokamak edge plasmas
Effect of neutral atoms on tokamak edge plasmas
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DOI：
10.1063/1.1418241
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发表时间：
2001-11
影响因子：
2.2
通讯作者：
T. Fülöp;P. Catto;P. Helander
中科院分区：
文献类型：
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作者：
T. Fülöp;P. Catto;P. Helander
中性原子可以显著地影响托卡马克边缘等离子体的物理，例如，通过影响那里的径向电场和等离子体流，这反过来对于等离子体约束是重要的。早期的工作[Fulop等人，等离子体5，3969（1998）]，假设短的平均自由程中性和Pfirsch-Schluter离子，已经表明，通过电荷交换的离子中性耦合影响新古典流速显着。然而，中性粒子的平均自由程并不总是很小，与边缘基座中密度和温度的径向尺度长度相比。因此，需要确定当中性平均自由程与标度长度相当时，在极限中会发生什么。在目前的工作中，自相似的解决方案的中性分布函数，允许强烈的温度和密度变化，以下Helander和Krasheninnikov [物理等离子体3，226（1995）]的分析。自相似的解决方案是可能的，如果比率…
Neutral atoms can significantly influence the physics of tokamak edge plasmas, e.g., by affecting the radial electric field and plasma flow there, which may, in turn, be important for plasma confinement. Earlier work [Fulop et al., Phys. Plasmas 5, 3969 (1998)], assuming short mean-free path neutrals and Pfirsch–Schluter ions, has shown that the ion-neutral coupling through charge-exchange affects the neoclassical flow velocity significantly. However, the mean-free path of the neutrals is not always small in comparison with the radial scale length of densities and temperatures in the edge pedestal. It is therefore desirable to determine what happens in the limit when the neutral mean-free path is comparable with the scale length. In the present work a self-similar solution for the neutral distribution function allowing for strong temperature and density variation is used, following the analysis of Helander and Krasheninnikov [Phys. Plasmas 3, 226 (1995)]. The self-similar solution is possible if the ratio...