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Radially Distributed Instabilities and Nonlinear Process to Generate Pressure Variation in a Torus Plasma

机译：径向分布不稳定性和非线性过程在环面等离子体中产生压力变化

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Distributed instabilities can successively change one after another to give accelerated radial propagation. The response of the linearly unstable distributed instabilities is identified in a gradual evolution phase as well as in a phase just after impact of modulation. Global nonlinear simulations of drift-interchange modes in helical plasmas are carried out with source modulation using a reduced MHD model. Conditional average of long time-series data with the modulation period reveals characteristic responses of the plasma. Smaller-scale variations comparable to the micro-temporal scale in this simulation are also included in the gradual evolution phase. The correlation analysis shows that the evolution of the mean pressure is strongly correlated with the strength of the nonlinear coupling. The evaluation of the energy balance to decompose the energy transfer into contribution from each three-wave coupling clarifies that a single mode coupling at each location has the dominant contribution to the smaller-scale pressure evolution in spite of self-organized mechanism with a wide range of comparable magnitude modes. Comparison of mode amplitudes does not define the dominant one, so identification of the active mode is useful for understanding the causality. This selection suggests the mechanism that gives the spreading effective in the quasi-steady state as for the ballistic propagation in the self-organized critical state.
机译：分布的不稳定性可以相继改变，从而加速径向传播。线性不稳定分布不稳定性的响应在渐进的演化阶段以及刚好在调制影响后的阶段被识别。螺旋等离子体中的漂移-交换模式的全局非线性仿真是使用简化的MHD模型通过源调制进行的。带有调制周期的长时间序列数据的条件平均值揭示了等离子体的特征响应。在此模拟中，与微时间尺度相当的较小尺度变化也包括在逐步演化阶段。相关分析表明，平均压力的变化与非线性耦合的强度密切相关。对能量平衡的评估以将能量传递分解为每个三波耦合的贡献，这表明，尽管存在自组织机制且作用域很广，但每个位置的单模耦合仍对较小规模的压力演化起主要作用。可比较的幅度模式。模式振幅的比较未定义主导模式，因此，对活动模式的识别对于理解因果关系很有用。这种选择提出了一种机制，它使准稳态状态下的扩散有效，而自组织临界状态下的弹道扩散也有效。

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