Excitation of zonal flow by intermediate-scale toroidal electron temperature gradient turbulence Journal Article uri icon



  • Abstract; On the basis of gyrokinetic theory, we derive nonlinear equations for the zonal flow (ZF) generation in intermediate-scale electron temperature gradient (ETG) turbulence (with wavelength much shorter than the ion Larmor radius but much longer than the electron Larmor radius) in nonuniform tokamak plasmas. Both the spontaneous and forced generation of ZFs are kept on the same footing. The resultant Schrödinger equation for the ETG amplitude is characterized by a Navier–Stokes type nonlinearity, which is typically stronger than the Hasegawa–Mima type nonlinearity resulting from the fluid approximation. The physics underlying the three stages of ZF generation process is clarified, and the role of parallel mode structure decoupling is discussed. It is found that ZFs can be more easily excited in the intermediate-scale ETG turbulence than in the short wavelength regime.

publication date

  • June 1, 2021

has restriction

  • green

Date in CU Experts

  • February 11, 2022 5:17 AM

Full Author List

  • Chen H; Tirkas S; Parker SE

author count

  • 3

Other Profiles

International Standard Serial Number (ISSN)

  • 0029-5515

Electronic International Standard Serial Number (EISSN)

  • 1741-4326

Additional Document Info

start page

  • 066017

end page

  • 066017


  • 61


  • 6