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Sawtooth stability in neutral beam heated plasmas in TEXTOR

机译：TEXTOR中性束加热等离子体中的锯齿稳定性

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摘要

The experimental sawtooth behaviour in neutral beam injection (NBI) heated plasmas in TEXTOR is described. It is found that the sawtooth period is minimized with a low NBI power oriented in the same direction as the plasma current. As the beam power is increased in the opposite direction to the plasma current, the sawtooth period increases to a maximum before it begins to shorten once more. Results from both magnetohydrodynamic stability modelling including toroidal flows and modelling of the kinetic effects of the fast ions resulting from NBI heating are also presented. This model combining the gyroscopic and kinetic effects upon the stability of the n = 1 internal kink mode-thought to be associated with sawtooth oscillations-qualitatively recovers the sawtooth behaviour exhibited in the experiment. It is proposed that the sawtooth period is minimized in the co-NBI direction at the point at which the stabilization of the kink mode due to rotation is weakest. This occurs when the plasma rotation induced by the NBI balances the intrinsic rotation of the plasma. The sawtooth behaviour in the counter-NBI regime is attributed to a subtle balance of the competing stabilization from the toroidal rotation and destabilization from the presence of energetic ions.
机译：描述了中性束注入（NBI）加热等离子体在TEXTOR中的实验锯齿行为。发现以与等离子体电流相同的方向取向的低NBI功率将锯齿期最小化。随着束功率沿与等离子流相反的方向增加，锯齿波周期增加到最大值，然后再开始缩短。还介绍了磁流体动力学稳定性建模（包括环形流）和NBI加热产生的快速离子动力学效应的建模结果。该模型结合了陀螺和动力学效应对n = 1内部扭结模式的稳定性的作用-被认为与锯齿振荡相关-定性地恢复了实验中显示的锯齿行为。提出了在由于旋转导致的扭结模式的稳定性最弱的点处在co-NBI方向上使锯齿周期最小化。当由NBI引起的等离子体旋转平衡了等离子体的固有旋转时，就会发生这种情况。反NBI机制中的锯齿行为归因于环形旋转的竞争性稳定与高能离子存在的不稳定的微妙平衡。

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