Zonal instability and wave trapping

Autor: David Zarzoso, O Panico, G. Dif-Pradalier, Yanick Sarazin, C. Gillot, Xavier Garbet, E Bourne, V. Grandgirard, Laure Vermare, Philippe Ghendrih, R Varennes
Přispěvatelé: Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), École normale supérieure de Lyon (ENS de Lyon), Physique des interactions ioniques et moléculaires (PIIM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Plasmas (LPP), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École polytechnique (X)-Sorbonne Université (SU)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Garbet, Xavier, École normale supérieure - Lyon (ENS Lyon)
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Journal of Physics: Conference Series
Journal of Physics: Conference Series, 2021
HAL
Journal of Physics: Conference Series, IOP Publishing, 2021
ISSN: 1742-6588
1742-6596
Popis: This paper presents a model for zonal flow generation based on a wave kinetic equation coupled to a poloidal momentum equation in a regime where wave trapping matters. Several models of the wave collision operator have been tested: Krook, diffusion and diffusion plus an instability growth rate. Conditions for zonal instability have been identified. It is found that a zonal instability is possible in all cases. However the force is a power law of the zonal velocity, so different from the quasi-linear case of random phases that produces a force that is linear in velocity. Also the zonal force may change sign, leading to flow radial profiles that are not sinusoidal.
Databáze: OpenAIRE
Externí odkaz: