Speaker
Chang-Bae Kim
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P2.1097.pdf
Impact of nonuniform zonal flow on the resistive-drift eigenmode near
adiabatic state
C.-B. Kim1 , C.-Y. An1 , B. Min1
1 Soongsil University, Seoul, Korea
The profile of the eigenmode of the resistive-drift plasma with large growth rate is studied
with a sinusoidally forced zonal flow V . A generalized vorticy ψ, which is the difference be-
tween the electron density and the vorticity, is found to be advected by the gradients of the
density and the zonal vorticity. The phase difference δ between the electric potential and ψ is
positive for the linearly growing mode. δ is found to be larger for larger zonal-flow amplitude
whereas the growth is larger for smaller zonal-flow. Eigenmode is found to be localized with
the width of less than 10ρs around the peak of V in the direction of the electron diamagnetic
drift. Eigenmode is almost vanishing where V is fastest and parallel to the ion-diamagnetc drift.
Extension to the turbulence with a spontaneous zonal flow and its implications to the formation
of the transport barrier will be presented at the conference.
