The plasma response to an externally generated, static, n = 2, resonant magnetic perturbation (RMP) in the pedestal region of DIII-D H-mode discharge #158115 is investigated using a toroidal generalization of the asymptotic matching model presented by Fitzpatrick [Phys. Plasmas 27, 042506 (2020)]. Just as in a recent paper [Q. M. Hu et al., Phys. Plasmas 26, 120702 (2019)], it is hypothesized that the density pump-out phenomenon is due to locked magnetic island chains induced at the bottom of the pedestal, whereas the suppression of edge localized modes is associated with a locked magnetic island chain induced at the top of the pedestal. Neutral penetration inside the last closed magnetic flux-surface is found to have a significant influence on locked magnetic island chain formation at the bottom of the pedestal. It is found that locked island formation at the top of the pedestal is only possible when q95 lies in certain narrow windows. Finally, it is inferred that, in order to successfully induce a locked island chain at the top of the pedestal, an external RMP field-coil system must generate a magnetic field that is simultaneously strongly amplified by the plasma (via the ideal kink response) and has a large resonant component at a rational surface that lies close to the top of the pedestal.

中文翻译：

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DIII-D H 模式放电对静态谐振磁扰的响应的改进理论及其对边缘局部模式抑制的影响

使用 Fitzpatrick 提出的渐近匹配模型的环形推广研究了等离子体对 DIII-D H 模式放电基座区域中外部产生的、静态的、n = 2 的谐振磁扰 (RMP) 的响应 #158115 [Phys . 血浆 27, 042506 (2020)]。正如最近的一篇论文 [QM Hu et al., Phys. Plasmas 26, 120702 (2019)]，假设密度泵出现象是由于在基座底部感应的锁定磁岛链引起的，而边缘局部模式的抑制与感应的锁定磁岛链有关。在基座的顶部。发现最后一个闭合磁通表面内的中性穿透对基座底部的锁定磁岛链形成有显着影响。发现只有当q95位于某些狭窄的窗口时，才可能在基座顶部形成锁定岛。最后推断，为了在基座顶部成功诱导锁定岛链，外部 RMP 场线圈系统必须产生一个磁场，该磁场同时被等离子体强烈放大（通过理想的扭结响应）并且在靠近基座顶部的有理表面处具有大的共振分量。