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Article Dans Une Revue Physics of Plasmas Année : 2016

Stimulated zonal flow generation in the case of TEM and TIM microturbulence

Etienne Gravier
Maxime Lesur
Thomas Drouot

Résumé

In this paper we show that in some parameter range in gyrokinetic simulations, it is possible to apply a control method to stimulate the appearance of zonal flows while minimizing the duration of the control process and the impact on plasma parameters. For this purpose, a gyrokinetic code considering only trapped particles is used. The starting point of our work is a situation where zonal flows transiently appear after the nonlinear phase of saturation of TEM (Trapped Electron Modes) or TIM (Trapped Ion Modes) micro-instabilities. These are observed to be strongly reduced in a later phase, permitting streamers to govern the plasma behavior in the steady-state. By intervening during this latter state (after this transient growth and decay of zonal flow), i.e. by increasing the ion/electron temperature ratio for a short time, it is found to be possible to bifurcate to a new steady-state, in which zonal flows are strongly present and are maintained indefinitely, thereby allowing a significant reduction in radial heat fluxes.
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Dates et versions

hal-01489774 , version 1 (14-03-2017)

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Etienne Gravier, Maxime Lesur, Thierry Reveille, Thomas Drouot. Stimulated zonal flow generation in the case of TEM and TIM microturbulence. Physics of Plasmas, 2016, 23 (9), pp.92507 - 92507. ⟨10.1063/1.4962845⟩. ⟨hal-01489774⟩
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