Effect of E×B flows on global linear ion temperature gradient modes
Effect of E×B flows on global linear ion temperature gradient modes
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E×B 流对全局线性离子温度梯度模式的影响
DOI：
10.1063/1.1343510
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发表时间：
2001
影响因子：
2.2
通讯作者：
L. Villard
中科院分区：
文献类型：
--
作者：
M. Macciò;J. Václavík;L. Villard
强电场产生平衡等离子体的E×B旋转。实验表明，这种效应可以降低托卡马克中的反常输运。因此，研究了这些流动对离子温度梯度(ITG)模线性稳定性的影响。研究了具有同心圆形磁表面的大长宽比托卡马克的回转动力学方程在全二维极向平面上的谱求解问题。结果表明，E×B流对ITG模有很强的稳定化作用。对不同流型的研究表明，所谓的流曲率(二阶导数)没有影响，而流强本身产生的影响最大。关于不同磁性剪切的研究不允许发现负磁性剪切情况的任何特定行为。最后，进行了实验对比。
Strong electric fields generate an E×B rotation of the equilibrium plasma. Experiments have shown that this effect could lower the anomalous transport in tokamaks. The study of the effect of these flows on the linear stability of ion temperature gradient (ITG) modes has therefore been undertaken. The question is addressed solving the spectrum of the gyrokinetic equation in the full two-dimensional poloidal plane for a large aspect ratio tokamak with concentric circular magnetic surfaces. Results show a strong stabilizing effect of E×B flows on the ITG modes. Study with respect to different profiles of the flow shows that the so-called curvature of flow (second derivative) has no effect, while the intensity of flow itself produces the strongest effect. Study with respect to different magnetic shears did not allow the discovery of any particular behavior of the negative magnetic shear cases. Eventually, an experimental comparison was conducted.