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Published on: July 19, 2016
Nonlinear excitation of zonal flows by turbulent energy flux
Zihao Wang1, Zongliang Dai1, Shaojie Wang1
1Department of Engineering and Applied Physics, University of Science and Technology of China, Hefei 230026, China.
Abstract:
The nonlinear excitation of zonal flows (ZFs) generated by the ion-temperature-gradient turbulence in a tokamak plasma is investigated by using the global gyrokinetic code nlt. It is found that ZFs are initially driven by the nonlinear self-interaction of the eigenmode. In the nonlinear saturation, the modulational instability becomes important, and its contribution to ZFs can finally be comparable to that of the self-interaction mechanism. More importantly, both types of nonlinear wave-wave interactions can be well described by the turbulent energy flux model.
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