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Role of electric currents for the SOL and divertor target heat fluxes in ASDEX Upgrade

机译：ASDEX升级中溶胶和偏转器靶热通量电流的作用

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摘要

In divertor tokamaks electric currents flowing in the Scrape-Off Layer (SOL) are a frequently observed and well known feature. However, the convective heat flux carried by these currents is often assumed to be small compared to the total parallel heat flux. In this paper it is shown that in ASDEX Upgrade the electric current, which was measured by Langmuir probes at the outer target, can be several times larger than the ion saturation current in low density L- and H-mode discharges. Therefore they have to be taken into account when calculating the target heat flux from the Langmuir probe data. Moreover, a detailed analysis reveals that for low density L- and H-mode discharges the heat flux profile is mainly determined by the current profile. By applying a 1D heat flux transport model it is demonstrated that the electric current can carry a large fraction (> 50 %) of the electron heat flux along the SOL convectively. Thus a Spitzer-Harm approach, where it is assumed that heat is transported only conductively, might not be valid in the investigated regime.
机译：在转移器Tokamaks中，在刮削层（溶胶）中流动的电流是经常观察到的且已知的特征。然而，与总并行热通量相比，这些电流承载的对流热通量通常被认为是小的。在本文中，示出在ASDEX升级电流中，通过外目标的Langmuir探针测量，可以比低密度L和H模式放电的离子饱和电流大的几倍。因此，当计算来自Langmuir探针数据的目标热量通量时必须考虑它们。此外，详细分析显示，对于低密度L和H模式排出热通量轮廓主要由电流轮廓确定。通过施加1D热通量传输模型，证明电流可以定性地沿着溶胶携带大的馏分（> 50％）电子热通量。因此，假设仅在进行调查的制度中仅传送热量的刺激性方法，在那里假设热量仅传送热量。

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