Three‐dimensional magnetohydrodynamic studies of the reversed‐field pinch
Three‐dimensional magnetohydrodynamic studies of the reversed‐field pinch
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DOI：
10.1063/1.865151
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发表时间：
1985
影响因子：
4.6
通讯作者：
D. Schnack;E. Caramana;R. Nebel
中科院分区：
文献类型：
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作者：
D. Schnack;E. Caramana;R. Nebel
对反向场箍缩中的非线性电阻磁流体动力学（MHD）不稳定性进行了三维计算研究。结果发现，多螺旋度模式耦合效应改变的m=1模式从单螺旋度得到的演变。观察到m=0和m=2的强模式耦合。磁岛重叠导致随机磁力线。在较低的值的捏参数，这是局限于捏的中心区域，对于较大的值的随机性可能会延伸到壁。愈合外通量表面观察到的模式峰值和放松。正环向磁通的衰减被延迟。约束的影响进行了讨论，并与实验观察。
Three‐dimensional computational studies of nonlinear resistive megnetohydrodynamic (MHD) instabilities in the reversed‐field pinch are presented. It is found that multihelicity mode coupling effects alter the evolution of m=1 modes from that obtained in single helicity. Strong mode coupling to m=0 and m=2 is observed. Magnetic island overlap results in stochastic field lines. At low values of the pinch parameter this is confined to the central region of the pinch; for larger values the stochasticity may extend to the wall. Healing of outer flux surfaces is observed as modes peak and relax. Decay of positive toroidal flux is retarded. Impact on confinement is discussed, and connection is made with experimental observations.