Kinetic theory of magnetic island stability in tokamaks
Kinetic theory of magnetic island stability in tokamaks
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DOI：
10.1063/1.870645
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发表时间：
1994-06
影响因子：
2.2
通讯作者：
M. Zabiégo;X. Garbet
中科院分区：
文献类型：
--
作者：
M. Zabiégo;X. Garbet
研究了低波数和大波数撕裂模的非线性行为。重点放在抗磁效应。一个动力学方程，包括与微湍流的背景相关联的传输过程，被用来描述的电子组件。这样的运输过程中发挥了重要的作用，在调整的密度和温度分布，并在计算的岛屿旋转频率。波动电势是使用电子和离子的微分响应自洽地计算的。四个制度被认为是，有关岛的宽度（小于或大于离子拉莫尔半径）和运输制度（电子-离子碰撞或电粘度为主）。结果表明，抗磁性不影响小岛宽度在粘性制度的稳定性，只要保持恒定的阻尼约束。结果表明，这一约束的释放可能会强烈修改以前计算的稳定性理论。
The nonlinear behavior of low‐ and large‐wave number tearing modes is studied. The emphasis is laid on diamagnetic effects. A kinetic equation, including transport processes associated with a background of microturbulence, is used to describe the electron component. Such transport processes are shown to play a significant role in the adjustment of density and temperature profile, and also in the calculation of the island rotation frequency. The fluctuating electric potential is calculated self‐consistently, using the differential response of electrons and ions. Four regimes are considered, related to island width (smaller or larger than an ion Larmor radius) and transport regime (electron–ion collisions or electroviscosity dominated). It is shown that diamagnetism does not influence the island stability for small island width in the viscous regime, as long as the constant Ψ constraint is maintained. It turns out that the release of this constraint may strongly modify the previously calculated stability th...