Magnetic shear effect on zonal flow generation in ion-temperature-gradient mode turbulence
Lu He-Lin1, Li Yue-Xun1, Yang Kai1, Chen Zhong-Yong2
1. Department of Physics, Yunnan Nationalities University, Kunming 650031, China;
2. School of Physics and Electronic Information Technology, Yunnan Normal University, Kunming 650092, China
By decoupling the nonlinear fluid equations of ion-temperature-gradient (ITG) mode, the zonal flow-drift wave nonlinear dynamical equation including magnetic shear is derived. The role of magnetic shear for zonal flow generation by ITG mode turbulence is studied using a four-wave interaction model of modulational instability. Finally we can draw the conclusion that within a smaller range of k//, as |k//| increases, the growth rate of zonal flow is also increased.
Lu He-Lin,Chen Zhong-Yong,Li Yue-Xun et al. Magnetic shear effect on zonal flow generation in ion-temperature-gradient mode turbulence. Acta Phys. Sin., 2011, 60(8): 085202.