Investigation of tokamak turbulent avalanches using wave-kinetic formulation in toroidal geometry
Abstract
The interplay between toroidal drift wave turbulence and tokamak profiles is investigated using a wave-kinetic description. The coupled system is used to investigate the interplay between marginally stable toroidal drift-wave turbulence and geodesic-acoustic modes (GAM). The coupled system is found to be unstable. Notably, the most unstable mode corresponds to the resonance between the turbulent wave radial group velocity and the GAM phase velocity. For a low-field-side ballooned drift wave growth, a background flow shear breaks the symmetry between inwards-and outwards-travelling instabilities. This mechanism is generic and displays many of the features expected for avalanches in developed tokamak turbulence.
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Cites 10.1017/S0022377821000350 Investigation of tokamak turbulent avalanches using wave-kinetic formulation in toroidal geometry, https://doi.org/10.1017/s0022377821000350