Open AccessMagnetic shear effect on zonal flow generation in ion-temperature-gradient mode turbulence
Author(s) -
Lu He-Lin,
Zhongyong Chen,
Yuexun Li,
Kai Yang
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.085202
Subject(s) - decoupling (probability) , physics , turbulence , modulational instability , mechanics , shear flow , zonal flow (plasma) , nonlinear system , shear (geology) , instability , temperature gradient , wave turbulence , classical mechanics , materials science , plasma , meteorology , quantum mechanics , control engineering , engineering , composite material , tokamak
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.