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首页> 外文期刊>Plasma physics and controlled fusion >Connection between plasma response and resonant magnetic perturbation (RMP) edge localized mode (ELM) suppression in DIII-D
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Connection between plasma response and resonant magnetic perturbation (RMP) edge localized mode (ELM) suppression in DIII-D

机译：DIII-D中等离子体响应与共振磁扰（RMP）边缘局部模式（ELM）抑制之间的连接

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Calculations of the plasma response to applied non-axisymmetric fields in several DIII-D discharges show that predicted displacements depend strongly on the edge current density. This result is found using both a linear two-fluid-MHD model (M3D-C1) and a nonlinear ideal-MHD model (VMEC). Furthermore, it is observed that the probability of a discharge being edge localized mode (ELM)-suppressed is most closely related to the edge current density, as opposed to the pressure gradient. It is found that discharges with a stronger kink response are closer to the peeling-ballooning stability limit in ELITE simulations and eventually cross into the unstable region, causing ELMs to reappear. Thus for effective ELM suppression, the RMP has to prevent the plasma from generating a large kink response, associated with ELM instability. Experimental observations are in agreement with the finding; discharges which have a strong kink response in the MHD simulations show ELMs or ELM mitigation during the RMP phase of the experiment, while discharges with a small kink response in the MHD simulations are fully ELM suppressed in the experiment by the applied resonant magnetic perturbation. The results are cross-checked against modeled 3D ideal MHD equilibria using the VMEC code. The procedure of constructing optimal 3D equilibria for diverted H-mode discharges using VMEC is presented. Kink displacements in VMEC are found to scale with the edge current density, similar to M3D-C1, but the displacements are smaller. A direct correlation in the flux surface displacements to the bootstrap current is shown.
机译：对几种DIII-D放电中施加的非轴对称场的等离子体响应的计算表明，预测的位移很大程度上取决于边缘电流密度。使用线性两流体MHD模型（M3D-C1）和非线性理想MHD模型（VMEC）均可找到此结果。此外，可以观察到，放电被边缘局部模式（ELM）抑制的可能性与边缘电流密度密切相关，与压力梯度相反。发现在ELITE模拟中，具有更强扭结响应的放电接近剥离-气球稳定极限，并最终进入不稳定区域，导致ELM重新出现。因此，为了有效地抑制ELM，RMP必须防止等离子体产生与ELM不稳定性相关的大扭结响应。实验观察结果与发现一致。在MHD模拟中具有强烈扭结响应的放电在实验的RMP阶段显示ELM或ELM缓解，而在MHD模拟中具有较小扭结响应的放电在实验中通过施加共振磁扰动被完全ELM抑制。使用VMEC代码对照建模的3D理想MHD平衡对结果进行交叉检查。介绍了使用VMEC为转移的H模式放电构造最佳3D平衡的过程。发现VMEC中的扭结位移与边缘电流密度成比例，与M3D-C1相似，但位移较小。示出了通量表面位移与自举电流的直接相关性。

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