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Characterization of peeling-ballooning stability limits on the pedestal

机译：基座上的剥离-膨胀稳定性极限的表征

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The peeling-ballooning model for edge localized modes (ELMs) and pedestal constraints, based on ideal MHD instabilities driven by pressure gradients and current in the edge barrier region, has been broadly applied toward understanding ELM and pedestal behaviour in a number of tokamak experiments. Due in part to multiple driving terms, multiple wavelengths and second stability access physics, the peeling-ballooning stability limits which are proposed to constrain the pedestal and trigger ELMs depend sensitively on many details of the tokamak equilibrium. Here we present a technique for characterizing these stability constraints as a function of important parameters, using carefully constructed model equilibria. We discuss comparisons of calculated stability constraints to observed pedestal behaviour, in which an encouraging level of agreement is found. We then present results of an extensive series of calculations which characterize, the peeling-ballooning stability constraints as a function-of pedestal width, magnetic field, plasma current, density, and triangularity.
机译：边缘局部模式（ELM）和基座约束的剥离-气球模型基于边缘障碍区域中的压力梯度和电流驱动的理想MHD不稳定性，已被广泛用于理解许多托卡马克实验中的ELM和基座行为。部分地由于多个驱动项，多个波长和第二稳定性访问物理学，提出用于约束基座和触发ELM的剥离-气球稳定性极限敏感地取决于托卡马克平衡的许多细节。在这里，我们提出了一种使用精心构建的模型均衡来表征这些稳定性约束作为重要参数的函数的技术。我们讨论了计算的稳定性约束与观察到的基座行为的比较，其中发现了令人鼓舞的一致性。然后，我们介绍了一系列广泛的计算结果，这些结果表征了剥离气球稳定性约束与基座宽度，磁场，等离子体电流，密度和三角形度的关系。

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