Kinetic theory of m=1 internal instabilities
Kinetic theory of m=1 internal instabilities
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DOI：
10.1063/1.862094
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发表时间：
1978-10
影响因子：
4.6
通讯作者：
J. Drake
中科院分区：
文献类型：
--
作者：
J. Drake
使用俯仰角散射碰撞算子来表示电子-离子碰撞，在等离子体的整个碰撞性范围内对内部 m=1 不稳定性进行动力学研究。作为等离子体与磁压力 β 之比、理想磁流体动力驱动能量和碰撞性的函数，m=1 模式分为六个基本类别。在当前托卡马克放电的高β（通常为βmi/me≳1）、低碰撞性状态下，与沿B的电子热运动相关的多普勒效应强烈改变了不稳定性的结构和增长率。然而，当理想的磁流体动力驱动能量很大时，电子热效应可以忽略不计。还研究了密度和温度梯度对不稳定性的影响。当电子反磁频率 ω* 较大时，通常会发现两种不同的模式，一种是由电子温度梯度驱动的 ω≃ω*，另一种是由磁能驱动的 ‖ω‖≪ω*。斯...
The internal m=1 instability is investigated kinetically over the entire range of collisionality of the plasma using a pitch‐angle‐scattering collision operator to represent electron‐ion collisions. As a function of the ratio of plasma to magnetic pressure β, the ideal magnetohydrodynamic driving energy, and the collisionality, the m=1 mode falls into six basic categories. In the high β (typically βmi/me≳1), low collisionality regime of present tokamak discharges, the Doppler effects associated with electron thermal motion along B strongly modify the structure and growth rate of the instability. Electron thermal effects are found to be negligible, however, when the ideal magnetohydrodynamic driving energy is large. The effect of density and temperature gradients on the instability are also studied. When the electron diamagnetic frequency ω* is large, two distinct modes are typically found, one with ω≃ω* driven by the electron temperature gradient, and a second with ‖ω‖≪ω* driven by the magnetic energy. Si...