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Radial propagation of turbulence in tokamaks

X. Garbet, L. Laurent, A. Samain and J. Chinardet

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It is shown that turbulence propagation can be due to toroidal or non-linear mode coupling. An analytical analysis indicates that the toroidal coupling acts through convection while the non-linear effects induce diffusion. Numerical simulations suggest that the toroidal propagation is usually the faster process, except perhaps in some highly turbulent regimes. A consequence is the possibility of non-local effects on the fluctuation level and the associated transport

PACS

52.35.Ra Plasma turbulence

52.25.Fi Transport properties

52.35.Mw Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.)

52.65.-y Plasma simulation

52.25.Gj Fluctuation and chaos phenomena

52.55.Fa Tokamaks, spherical tokamaks

Subjects

Plasma physics

Dates

Issue 7 (July 1994)



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