Saturated ideal kink/peeling formations described as three-dimensional magnetohydrodynamic tokamak equilibrium states
Saturated ideal kink/peeling formations described as three-dimensional magnetohydrodynamic tokamak equilibrium states
复制标题
饱和理想扭结/剥离结构描述为三维磁流体动力学托卡马克平衡态
DOI：
10.1063/1.4945743
复制
发表时间：
2016
影响因子：
2.2
通讯作者：
T. Tran
中科院分区：
文献类型：
--
作者：
W. A. Cooper;D. Brunetti;B. Duval;J. Faustin;J. Graves;A. Kleiner;H. Patten;D. Pfefferlé;L. Porte;M. Raghunathan;H. Reimerdes;O. Sauter;T. Tran
首次计算了具有等离子体-真空界面自发三维变形的自由边界磁流体动平衡态。得到的结构具有饱和的理想外扭结/剥离模式。对于高边缘自举电流，高边缘压力梯度产生n = 1波纹的环向模数，当该电流小时，产生更大的n失真。等离子体边界区域的形变导致非轴对称的Pfisch-Schluter电流驱动场向电流带，这与已报道的实验结果一致。3d平衡的变化证实了n = 1模是扭结/剥离结构。我们推测，我们计算的平衡结构构成了一个可行的模型，用于研究定形托卡马克等离子体中与静止H模操作相关的边谐振荡和外模。
Free boundary magnetohydrodynamic equilibrium states with spontaneous three dimensional deformations of the plasma-vacuum interface are computed for the first time. The structures obtained have the appearance of saturated ideal external kink/peeling modes. High edge pressure gradients yield toroidal mode number n = 1 corrugations for a high edge bootstrap current and larger n distortions when this current is small. Deformations in the plasma boundary region induce a nonaxisymmetric Pfirsch-Schluter current driving a field-aligned current ribbon consistent with reported experimental observations. A variation in the 3D equilibrium confirms that the n = 1 mode is a kink/peeling structure. We surmise that our calculated equilibrium structures constitute a viable model for the edge harmonic oscillations and outer modes associated with a quiescent H-mode operation in shaped tokamak plasmas.