Electron temperature gradient driven microtearing mode
Electron temperature gradient driven microtearing mode
复制标题
电子温度梯度驱动微撕裂模式
DOI：
10.1063/1.863119
复制
发表时间：
1980
期刊：
影响因子：
--
通讯作者：
C. Liu
中科院分区：
文献类型：
--
作者：
N. T. Gladd;J. Drake;C. Chang;C. Liu
电子温度梯度驱动的微撕裂模的线性稳定性理论，最近提出的不稳定性作为一个可能的原因异常电子热输运托卡马克，被认为是。该理论是电磁的，并在剪切磁场的平板模型的背景下进行。与漂移波的线性理论相反，任何磁剪切都是完全稳定的，剪切实际上可能会增加微撕裂模式的增长率。不稳定性的关键特征是电子-离子碰撞的能量依赖性。该模式被证明是不稳定的电子温度梯度和程度的碰撞典型的当今托卡马克。据发现，以前的理论，这些模式是基于假设是不，在一般情况下，合理的;一个恰当的例子是，通常被忽视的静电效应实际上是相当重要的生产不稳定的事实。
The linear stability theory of an electron temperature gradient driven microtearing mode, an instability recently proposed as a possible cause for anomalous electron thermal transport in tokamaks, is considered. The theory is electromagnetic and is carried out within the context of a slab model with a sheared magnetic field. In contrast to the linear theory of drift waves, where any magnetic shear is completely stabilizing, shear may actually increase the growth rate of microtearing modes. The crucial feature required for instability is the energy dependence of electron‐ion collisions. The mode is shown to be unstable for electron temperature gradients and degrees of collisionality typical of present day tokamaks. It is found that previous theories of these modes were based on assumptions which are not, in general, justified; a case in point being the fact that the usually neglected electrostatic effects are actually quite important in producing instability.