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Temperature Gradient Stabilization of Edge Thermal Fluctuations as an Explanationof the Low yields High (L yields H) Mode Transition

机译:边缘热波动的温度梯度稳定作为低产量高(L收率H)模式转换的解释

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摘要

A linear analysis of the plasma edge identifies edge localized, radial, thermalfluctuations driven by atomic physics and radiation through coupling with a positive temperature dependence of the radial thermal diffusivity. These instabilities are stabilized by a sufficiently large edge radial temperature gradient. A temperature gradient, or conductive edge heat flux, threshold is thus identified. The predicted thermal fluctuation wavelength is consistent with experimental observation. If transport in the (low) L-mode is dominated by thermal fluctuations, then the low to high (L to H) transition would take place when the conductive heat flux to the edge produces an edge temperature gradient sufficiently large to stablize the edge thermal fluctuations. The predicted consequences following from this postulated mechanism for the L to H transition are in accord with observed phenomena associated with the L to H transition and with the observed parameter dependences of the L to power threshold.

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