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The understanding of the outward radial transport of heat in magneticconfinement fusion devices is a priority for the development of economicallyviable fusion reactors. Here, we analyze the radial propagation ofspontaneously generated electron temperature (T_e) fluctuations measured usingthe Electron Cyclotron Emission (ECE) diagnostic in Wendelstein 7-X, whichdisposes of 32 channels, covering a large part of the plasma minor radius. Byapplying a relatively new statistical analysis technique (the TransferEntropy), the present work provides, for the first time, a view of the detailedmechanism of electron heat transport in fusion plasmas. It is shown thatrational surfaces have a significant impact on radial heat transport and may infact be essential in setting the global energy confinement. The reportedobservations provide support for various explanatory concepts suggested inliterature: namely, critical gradients, non-locality, and self-organization.

The impact of heating power on radial heat transport in W7-X