Control of MHD instabilities by ECCD: ASDEX Upgrade results and implications for ITER
Control of MHD instabilities by ECCD: ASDEX Upgrade results and implications for ITER
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DOI：
10.1088/0029-5515/47/3/010
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发表时间：
2007-03
期刊：
影响因子：
3.3
通讯作者：
H. Zohm;G. Gantenbein;F. Leuterer;A. Manini;M. Maraschek;Q. Yu
中科院分区：
文献类型：
--
作者：
H. Zohm;G. Gantenbein;F. Leuterer;A. Manini;M. Maraschek;Q. Yu
综述了电子回旋电流驱动（ECCD）控制MHD不稳定性的要求。结果表明，控制锯齿和新经典撕裂模式（ntm）都需要局域电流驱动。在ntm的情况下，沉积宽度应小于岛宽，以有效控制。在岛宽度小于沉积宽度的情况下，如在ITER中预测的那样，理论表明只有通过与岛相调制ECCD功率才能有效控制。这些预测在NTM控制的ASDEX Upgrade实验中得到了证实。在ASDEX Upgrade中，窄沉积也被用于将NTM稳定的工作范围扩展到更低的q95和改进的h模式场景。我们的研究结果表明，对于ITER ECCD系统，良好的驱动电流分布定位以及用旋转模式同步调制ECCD的能力将是ECCD有效控制MHD的必要条件。
The requirements for control of MHD instabilities by electron cyclotron current drive (ECCD) are reviewed. It is shown that a localized current drive is needed for control of both sawteeth and neoclassical tearing modes (NTMs). In the case of NTMs, the deposition width should be smaller than the island width for efficient control. At island widths smaller than the deposition width, as is predicted to occur in ITER, theory suggests that efficient control is possible only by modulating the ECCD power in phase with the island. These predictions are experimentally confirmed in ASDEX Upgrade for NTM control. Narrow deposition has also been used to extend the operational range of NTM stabilization in ASDEX Upgrade to lower q95 and in the improved H-mode scenario. Our results suggest that, for the ITER ECCD system, good localization of the driven current profile as well as the capability to modulate the ECCD in phase with rotating modes will be needed for efficient MHD control by ECCD.