Time‐dependent plasma transport simulation for the study of edge impurity radiation dynamics with magnetic island in large helical device,Contributions to Plasma Physics

当前位置： X-MOL 学术 › Contrib. Plasm. Phys. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Time‐dependent plasma transport simulation for the study of edge impurity radiation dynamics with magnetic island in large helical device
Contributions to Plasma Physics ( IF 1.3 ) Pub Date : 2020-01-29 , DOI: 10.1002/ctpp.201900138
Masahiro Kobayashi _{1,

2} , Mikhail Z. Tokar _{1,

3}

Affiliation

The dynamics of impurity radiation distribution during detachment transition with edge magnetic island induced by the application of resonant magnetic perturbation (RMP) is studied numerically by solving time‐dependent plasma fluid equations together with impurity and neutral transports in a 2D grid system. Computations provide the appearance of a macroscopic structure in the heat transfer along the island separatrix and outside the island. The resultant parallel temperature gradient generates the plasma flow and the density gradient according to the parallel momentum balance. The resulting plasma flow effectively transports impurity towards the X‐point region. As a result, the impurity radiation is more intense near the X‐point than in the vicinity of the O‐point. This leads to the predominant cooling of the region around the X‐point. These results are in agreement with experimental observation with RMP application in the large helical device (LHD). The time scale of the thermal condensation instability is found to be of the order of 10 ms.

中文翻译：

时变等离子体传输模拟，用于研究大型螺旋装置中带有磁岛的边缘杂质辐射动力学

通过在二维网格系统中求解时间相关的等离子体流体方程以及杂质和中性输运，对由共振磁扰动（RMP）的应用引起的边缘磁性岛脱离过渡期间的杂质辐射分布动力学进行了数值研究。计算结果表明，沿着岛状分离层和岛外的传热过程呈现出宏观结构。产生的平行温度梯度根据平行动量平衡生成等离子体流和密度梯度。产生的等离子体流有效地将杂质向X点区域传输。结果，杂质辐射在X点附近比在O点附近更强烈。这导致X点附近区域的主要冷却。这些结果与在大型螺旋装置（LHD）中使用RMP进行的实验观察一致。发现热凝结不稳定性的时间标度为约10ms。

更新日期：2020-01-29

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11