Turbulence spreading as a non-local mechanism of global confinement degradation and ion temperature profile stiffness

Abstract

A new non-local mechanism of the global confinement degradation and ion temperature profile stiffness is proposed based on the results of global gyrokinetic simulations. We find that turbulence spreading into a marginally stable zone can increase turbulent transport to a level exceeding the predictions of the local theories. Also, we present the first… (More)

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