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During the past years the understanding of the multi-scale interactionproblems have increased significantly. However, at present there exists a rangeof different analytical models for investigating multi-scale interactions andhardly any specific comparisons have been performed among these models. In thiswork, two different models for the generation of zonal flows fromion-temperature-gradient (ITG) background turbulence are discussed andcompared. The methods used is the coherent mode coupling model and the wavekinetic equation model (WKE). It is shown that the two models givequalitatively the same results even though the assumption on the spectraldifference is used in the (WKE) approach.

Comparison of multi-scale analysis models applied to zonal flow generation in ion-temperature-gradient mode turbulence