It is shown that, in tokamak plasmas, finite drift/banana-orbit width (FOW) effects play crucial roles in the nonlinear evolution of kinetic/geodesic acoustic modes (KGAM/GAM). In particular, it is found that, in contrast to the negligible second-harmonic generation, KGAM/GAM can generate appreciable zero-frequency zonal flow (ZFZF) due to the FOW effects. On the other hand, ZFZF is found to have negligible effects on the dynamics of GAM/KGAM. This route of generating ZFZF has important implications to the nonlinear dynamics of zonal flows and, consequently, drift wave turbulences. © CopyrightEPLA, 2014.

On nonlinear geodesic acoustic modes in tokamak plasmas

Zonca, F.
2014

Abstract

It is shown that, in tokamak plasmas, finite drift/banana-orbit width (FOW) effects play crucial roles in the nonlinear evolution of kinetic/geodesic acoustic modes (KGAM/GAM). In particular, it is found that, in contrast to the negligible second-harmonic generation, KGAM/GAM can generate appreciable zero-frequency zonal flow (ZFZF) due to the FOW effects. On the other hand, ZFZF is found to have negligible effects on the dynamics of GAM/KGAM. This route of generating ZFZF has important implications to the nonlinear dynamics of zonal flows and, consequently, drift wave turbulences. © CopyrightEPLA, 2014.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.12079/2761
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