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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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https://hal.archives-ouvertes.fr/hal-03099961
Contributor : Yanick Sarazin Connect in order to contact the contributor
Submitted on : Wednesday, January 6, 2021 - 1:47:44 PM
Last modification on : Saturday, May 14, 2022 - 3:36:36 AM
Long-term archiving on: : Wednesday, April 7, 2021 - 8:17:28 PM

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  • HAL Id : hal-03099961, version 1

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Camille Gillot, Guilhem Dif-Pradalier, Xavier Garbet, Olivier Panico, Yanick Sarazin, et al.. Investigation of tokamak turbulent avalanches using wave-kinetic formulation in toroidal geometry. Journal of Plasma Physics, Cambridge University Press (CUP), 2021. ⟨hal-03099961⟩

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