Abstract
The article reports on recent developments in the theory of secondaryinstability in drift-ion temperature gradient turbulence. Specifically, the article exploressecondary instability as a mechanism for zonal flow generation,transport barrier dynamics and avalanche formation. These in turnare related to the space-time statistics of the drift wave inducedflux, the scaling of transport with collisionality and β, and thespatio-temporal evolution of transport barriers.
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