Observations of pressure gradient driven m = 1 internal kink mode in EAST tokamak
Observations of pressure gradient driven m = 1 internal kink mode in EAST tokamak
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DOI：
10.1063/1.4773032
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发表时间：
2012-12
影响因子：
2.2
通讯作者：
Liqing Xu;Liqun Hu;Kaiyun Chen;E. Li;Fudi Wang;Ming Xu;Y. Duan;T. Shi;J. Zhang;R. Zhou-R.-Zh
中科院分区：
文献类型：
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作者：
Liqing Xu;Liqun Hu;Kaiyun Chen;E. Li;Fudi Wang;Ming Xu;Y. Duan;T. Shi;J. Zhang;R. Zhou-R.-Zh
压力梯度驱动的m = 1内部扭结模式不稳定，下面的L-H过渡，观察在EAST托卡马克，这体现在软X射线（SXR）和Mirnov线圈信号的周期性振荡的操作区域。利用高分辨软X射线探测阵列层析成像，我们发现在极向截面上，1/1扭结模的旋转方向是离子抗磁漂移方向。热芯的大位移归因于1/1内扭结模的移动。与具有固定频率的平稳振荡相比，在这种1/1扭结模式下观察到各种频率的啁啾行为。此外，我们还偶尔观察到，在高性能等离子体中，1/1内部扭结模通过模式耦合触发2/1新经典撕裂模（NTM）。本文还给出了1/1扭结模的谐波模2/2模的空间结构。大量的中Z杂质聚集在中心区。
Pressure gradient driven m = 1 internal kink mode destabilization that follows an L-H transition is observed in the operational region of the EAST tokamak, which manifests in periodic oscillations in soft x-ray (SXR) and Mirnov coil signals. Using tomography with the high resolution soft x-ray detection array, we find that the rotation direction of the 1/1 kink mode is in the ion diamagnetic drift direction in poloidal cross-section. A large displacement of the hot core is attributable to the shift of the 1/1 internal kink mode. In contrast to stationary oscillations with fixed frequency, various frequency chirping behavior is observed with this 1/1 kink mode. Furthermore, we also occasionally observe that a 2/1 neoclassical tearing mode (NTM) is triggered by a 1/1 internal kink mode via mode coupling in a high-performance plasma. The spatial structure of a 2/2 mode, which is the harmonic mode of the 1/1 kink mode, is also presented in this paper. Large amounts of medium-Z impurities accumulate in the cen...