Zero frequency zonal flow (ZFZF) excitation by trapped energetic electron driven beta-induced Alfvén eigenmode (eBAE) is investigated using non-linear gyrokinetic theory. It is found that, resonant energetic electrons (EEs) not only effectively drive eBAE unstable, but also contribute to the non-linear coupling, leading to ZFZF excitation. The trapped EE contribution to ZFZF generation is dominated by EE responses to eBAE in the ideal region, and is comparable to thermal plasma contribution to Reynolds and Maxwell stresses.
Zero frequency zonal flow excitation by energetic electron driven beta-induced Alfvén eigenmode
Zonca F.;
2020-01-01
Abstract
Zero frequency zonal flow (ZFZF) excitation by trapped energetic electron driven beta-induced Alfvén eigenmode (eBAE) is investigated using non-linear gyrokinetic theory. It is found that, resonant energetic electrons (EEs) not only effectively drive eBAE unstable, but also contribute to the non-linear coupling, leading to ZFZF excitation. The trapped EE contribution to ZFZF generation is dominated by EE responses to eBAE in the ideal region, and is comparable to thermal plasma contribution to Reynolds and Maxwell stresses.File in questo prodotto:
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