Simulation of plasma transport by coherent structures in scrape-off-layer tokamak plasmas
Simulation of plasma transport by coherent structures in scrape-off-layer tokamak plasmas
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刮离层托卡马克等离子体中相干结构的等离子体输运模拟
DOI：
10.1063/1.1771658
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发表时间：
2004
影响因子：
2.2
通讯作者：
Raghvendra Singh
中科院分区：
文献类型：
--
作者：
N. Bisai;A. Das;S. Deshpande;R. Jha;P. Kaw;A. Sen;Raghvendra Singh
近年来，利用电子连续性方程和电流平衡方程研究了托卡马克等离子体刮削层（SOL）中二维交换湍流相干结构的形成及其对等离子体反常输运的贡献。在本文中，我们证明了在模拟中加入电子能量方程会显著地改变相干结构的性质，并给出了与实验符合得更好的结果。具体地说，它是观察到的径向电位梯度建立了一个极向伸长和运动的结构。只有在径向传输事件中，结构才在径向方向上得到显着扩展，给出1 km/s量级的径向速度。有时候会观察到密度结构从主等离子体中分离出来。这些分离的结构要么衰变到背景等离子体中，要么从SOL中传输出来。并对模拟粒子通量及其统计特性进行了讨论。
The formation of coherent structures by two-dimensional interchange turbulence in the scrape-off layer (SOL) of tokamak plasmas and their subsequent contribution to anomalous plasma transport has been studied in recent years using electron continuity and current balance equations. In this paper, it is demonstrated that the inclusion of electron energy equation in the simulations changes the nature of coherent structures in a significant manner and gives results which are in better agreement with experiments. Specifically, it is observed that radial potential gradients are established which give a poloidal elongation and movement to the structures. Only during the radial transport events do the structures get significantly extended in the radial direction giving radial velocities of order 1 km/s. Sometimes detachment of density structures from the main plasma is observed. These detached structures either decay into the background plasma or are transported out from the SOL. The simulated particle flux and its statistical properties also are discussed.