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Article Dans Une Revue Journal of Physics: Conference Series Année : 2021

Zonal instability and wave trapping

Résumé

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.
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Dates et versions

hal-03081047 , version 1 (18-12-2020)

Identifiants

  • HAL Id : hal-03081047 , version 1

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Xavier Garbet, O Panico, R Varennes, C Gillot, Guilhem Dif-Pradalier, et al.. Zonal instability and wave trapping. Journal of Physics: Conference Series, 2021. ⟨hal-03081047⟩
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