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Local threshold conditions and fast transition dynamics of the L-H transition in Alcator C-Mod

机译:Alcator C-Mod中L-H跃迁的局部阈值条件和快速跃迁动力学

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Edge profiles during the L-H transition and pedestal evolution in the Alcator C-Mod tokamak have been measured with high spatial and time resolution. For input power near the threshold, periodic 'dithering' cycles are seen, and the sustained transition occurs in a series of steps that appear related to this oscillatory behaviour. Even at a higher power, there is evidence of non-smooth T-e evolution, and the pedestal T-e shows a double break-in-slope at the transition. Calculations with a fluctuation-shear flow model, for parameters typical of this experiment, reproduce much of the observed behaviour. Profiles just before the L-H transition, averaged over steady or dithering periods, are compared with an analytic criterion based on shear suppression by zonal flows (Guzdar P N et al 2002 Phys. Rev. Lett. 89 265004). The experimental values of T-e/rootL (n) are about 50% below the theoretical threshold, for a range of B-T.
机译:Alcator C-Mod托卡马克在L-H过渡和基座演变过程中的边缘轮廓已通过高空间和时间分辨率进行了测量。对于接近阈值的输入功率,会看到周期性的“抖动”周期,并且持续的过渡会在一系列与这种振荡行为相关的步骤中发生。即使在更高的功率下,也有T-e演变不平滑的迹象,而基座T-e在过渡处显示出双重侵入坡度。对于本实验的典型参数,使用波动剪切流模型进行的计算可重现许多观察到的行为。将在稳定或抖动周期内平均的L-H跃迁之前的剖面与基于纬向流剪切抑制的分析标准进行比较(Guzdar P N等人,2002 Phys。Rev. Lett。89 265004)。对于一定范围的B-T,T-e / rootL(n)的实验值比理论阈值低约50%。

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