论文标题
预测在强驱动的陀螺仪限制下，通过减少模式的第三纪不稳定性分析的变化。
Predicting the Dimits shift through reduced mode tertiary instability analysis in a strongly driven gyrokinetic fluid limit
论文作者
论文摘要
据信，第三纪不稳定性对于在强层流量产生强度的条件下，接近边缘稳定性的条件下，对磁性等离子体的湍流很重要。在这项工作中，我们调查了它在无碰撞强驱动的流体模型中的作用，该模型是自以为是的，作为陀螺仪的极限。发现存在于线性阈值以上的绝对稳定性区域，超出该区域的非线性运输迅速发展。虽然在此范围内发现稳定的轮廓之前，就会观察到瞬时Zonal进化的复杂模式，只要包括线性效应，DIMITS过渡本身就与第三纪不稳定性阈值一致。通过一个简单且易于扩展的程序，可以将其起源追溯到2017年（ARXIV：1704.05406），可以近似典型的区域轮廓的稳定效果，并且伴随的减少模式估计值与非线性模拟非常吻合。
The tertiary instability is believed to be important for governing magnetised plasma turbulence under conditions of strong zonal flow generation, near marginal stability. In this work, we investigate its role for a collisionless strongly driven fluid model, self-consistently derived as a limit of gyrokinetics. It is found that a region of absolute stability above the linear threshold exists, beyond which significant nonlinear transport rapidly develops. While within this range a complex pattern of transient zonal evolution is observed before a stable profile is found, the Dimits transition itself is found to coincide with a tertiary instability threshold so long as linear effects are included. Through a simple and readily extendable procedure tracing its origin to St-Onge 2017 (arXiv:1704.05406) the stabilising effect of the typical zonal profile can be approximated and the accompanying reduced mode estimate is found to be in good agreement with nonlinear simulations.
