Enhancement of zonal flow damping due to resonant magnetic perturbations in the background of an equilibrium $E\times B$ sheared flow

Abstract

Using a parametric interaction formalism, we show that the equilibrium sheared rotation can enhance the zonal flow damping effect found in Ref. [M. Leconte and P.H. Diamond, \emph{Phys. Plasmas} 19, 055903 (2012)]. This additional damping contribution is proportional to $(L_s/L_V{)}^2\times \delta B_r^2/B^2$, where $L_s/L_V$ is the ratio of magnetic shear length to the scale-length of equilibrium $E\times B$ flow shear, and $\delta B_r/B$ is the amplitude of the external magnetic perturbation normalized to the background magnetic field.

arXiv comment4 figures

References in corpus (1)

• Multiscale interaction between a large scale magnetic island and small scale turbulence

Cited by in corpus (2)

• Effect of magnetic perturbations on turbulence-flow dynamics at the L-H transition on DIII-D
• Effects of zonal flows on transport crossphase in dissipative trapped-electron mode turbulence in edge plasmas