Investigation of tokamak turbulent avalanches using wave-kinetic formulation in toroidal geometry

Autor: David Zarzoso, Yanick Sarazin, R Varennes, Guilhem Dif-Pradalier, C. Gillot, Xavier Garbet, Olivier Panico
Přispěvatelé: CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Physique des interactions ioniques et moléculaires (PIIM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Sarazin, Yanick
Rok vydání: 2021
Předmět:
Zdroj: Journal of Plasma Physics
Journal of Plasma Physics, 2021
ISSN: 1469-7807
0022-3778
Popis: 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 (GAMs). 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. Although this turbulence–GAM coupling may not be the primary driver for avalanches in standard core ion temperature gradient simulations, this mechanism is generic and displays many of the expected features, and should be of interest in several other regimes, which include towards the edge or in the presence of energetic particles.
Databáze: OpenAIRE
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