Linear ideal MHD predictions for n = 2 non-axisymmetric magnetic perturbations on DIII-D
Linear ideal MHD predictions for n = 2 non-axisymmetric magnetic perturbations on DIII-D
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DOI：
10.1088/0741-3335/56/3/035005
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发表时间：
2014-02
影响因子：
2.2
通讯作者：
S. Haskey;M. Lanctot;Y. Liu;J. Hanson;B. Blackwell;R. Nazikian
中科院分区：
文献类型：
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作者：
S. Haskey;M. Lanctot;Y. Liu;J. Hanson;B. Blackwell;R. Nazikian
在DIII-D托卡马克上对主要为n = 2非轴对称磁扰动（MPs）的等离子体响应的广泛研究表明，通过改变径向磁场的极向谱来控制3D场相互作用的潜力。等离子体响应作为外加磁场结构和等离子体参数的函数计算，使用线性磁流体力学代码MARS-F （Liu et al . 2000）。等离子体7 3681)。理想的单流体等离子体响应被分解为两个主要部分：发生在合理磁通量表面的局部螺距共振响应和全局扭结响应。电场对等离子体总响应的耦合效率取决于安全系数和外加电场的结构。在许多情况下，控制应用场比控制等离子体参数具有更显著的效果，这是特别感兴趣的，因为它可以在整个射击过程中随意修改以达到预期的效果。除了主导的n = 2分量外，环面谐波的存在也被检查，揭示了DIII-D MP线圈施加的扰动中显著的n = 4分量；然而，模型显示，在大多数情况下，等离子体对n = 4扰动的响应明显小于占主导地位的n = 2响应。
An extensive examination of the plasma response to dominantly n = 2 non-axisymmetric magnetic perturbations (MPs) on the DIII-D tokamak shows the potential to control 3D field interactions by varying the poloidal spectrum of the radial magnetic field. The plasma response is calculated as a function of the applied magnetic field structure and plasma parameters, using the linear magnetohydrodynamic code MARS-F (Liu et al 2000 Phys. Plasmas 7 3681). The ideal, single fluid plasma response is decomposed into two main components: a local pitch-resonant response occurring at rational magnetic flux surfaces, and a global kink response. The efficiency with which the field couples to the total plasma response is determined by the safety factor and the structure of the applied field. In many cases, control of the applied field has a more significant effect than control of plasma parameters, which is of particular interest since it can be modified at will throughout a shot to achieve a desired effect. The presence of toroidal harmonics, other than the dominant n = 2 component, is examined revealing a significant n = 4 component in the perturbations applied by the DIII-D MP coils; however, modeling shows the plasma responses to n = 4 perturbations are substantially smaller than the dominant n = 2 responses in most situations.