Nonlinear damping of plasma zonal flows excited by inverse spectral transfer |
| |
Authors: | Terry P W Gatto R Baver D A |
| |
Affiliation: | Department of Physics, University of Wisconsin-Madison, Madison, WI 53706, USA. |
| |
Abstract: | Plasma zonal-flow excitation and saturation in fluid electron-drift-wave turbulence are studied spectrally. The zonal flow is a spectral condensation onto the zero-frequency linear-wave structure. In the representation diagonalizing the wave coupling that dominates interactions at long wavelengths, nonlinear triad interactions involving zero-frequency waves are greatly enhanced. Zonal modes are excited on both unstable and purely stable eigenmode branches. Coupling to the latter introduces robust, finite amplitude-induced damping of zonal flows, providing saturation. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|