Modelling of plasma response to resonant magnetic perturbation fields in MAST and ITER
Modelling of plasma response to resonant magnetic perturbation fields in MAST and ITER
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DOI：
10.1088/0029-5515/51/8/083002
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发表时间：
2011-08
期刊：
影响因子：
3.3
通讯作者：
Yueqiang Liu;A. Kirk;Y. Gribov;M. Gryaznevich;T. Hender;E. Nardon
中科院分区：
文献类型：
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作者：
Yueqiang Liu;A. Kirk;Y. Gribov;M. Gryaznevich;T. Hender;E. Nardon
在线性、全环面、单流体电阻磁流体力学（MHD）模型和实际等离子体条件下，计算了包括等离子体响应在内的共振磁摄动（RMP）场。与微扰线圈产生的真空场相比，响应场大大减小。这种场的减小很大程度上依赖于环形等离子体旋转的屏蔽效应。计算还量化了由RMP场引起的等离子体表面的三维（3D）扭曲。在MAST实验中，计算得到的模态结构、等离子体表面位移和观测到的密度泵出效应之间存在相关性。通常，密度泵出倾向于在x点附近地表位移达到峰值时发生。
The resonant magnetic perturbation (RMP) fields, including the plasma response, are computed within a linear, full toroidal, single-fluid resistive magnetohydrodynamic (MHD) model, and under realistic plasma conditions for MAST and ITER. The response field is found to be considerably reduced, compared with the vacuum field produced by the magnetic perturbation coils. This field reduction relies strongly on the screening effect from the toroidal plasma rotation. Computations also quantify three-dimensional (3D) distortions of the plasma surface, caused by RMP fields. A correlation is found between the computed mode structures, the plasma surface displacement and the observed density pump-out effect in MAST experiments. Generally, the density pump-out tends to occur when the surface displacement peaks near the X-points.