Observation of reversed shear Alfvén eigenmodes between sawtooth crashes in the Alcator C-Mod tokamak.
Observation of reversed shear Alfvén eigenmodes between sawtooth crashes in the Alcator C-Mod tokamak.
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DOI：
10.1103/physrevlett.102.165003
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发表时间：
2009-04
影响因子：
8.6
通讯作者：
E. Edlund;M. Porkolab;Gerrit Kramer;L. Lin;Yu-Ming Lin;S. Wukitch
中科院分区：
文献类型：
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作者：
E. Edlund;M. Porkolab;Gerrit Kramer;L. Lin;Yu-Ming Lin;S. Wukitch
在alcater C-Mod托卡马克中观察到的锯齿碰撞之间的频率啁啾模组被解释为q=1表面附近的反剪切alfv<s:1>本征模。这些模式表明，在锯齿循环的松弛阶段产生了一个反向的剪切q曲线。两个重要的参数q_{min}和它的径向位置，由密度波动的测量值与理想MHD编码NOVA的计算值的比较推导出来。这些研究为进一步模拟锯齿周期提供了有价值的约束条件。
Groups of frequency chirping modes observed between sawtooth crashes in the Alcator C-Mod tokamak are interpreted as reversed shear Alfvén eigenmodes near the q=1 surface. These modes indicate that a reversed shear q profile is generated during the relaxation phase of the sawtooth cycle. Two important parameters, q_{min} and its radial position, are deduced from comparisons of measured density fluctuations with calculations from the ideal MHD code NOVA. These studies provide valuable constraints for further modeling of the sawtooth cycle.