(Color online) Diffusivity versus shearing rate for pure poloidal flow (large circles) and for pure toroidal flows (squares) and for the (a) Cyclone case and (b) Waltz standard case. In the left subplot, quadratic fits of these points are shown (solid lines, extreme cases with complete stabilisation have been omitted from the fit), with maximum ITG growth rate for these cases shown as a dashed line (small circles).
Flux versus time and radius for the Cyclone-like simulations with background shear (a) 0.1a/cs and (b) −0.1a/cs .
(Color online) The mean position of the heat flux profile, 〈rΛ〉/〈Λ〉, as a function of shearing rate. A linear fit is show for comparison.
(Color online) Components of poloidal flow for simulations with an imposed V-shaped poloidal flow (a) and toriodal flow (b) with ω = 0.2. The initial profiles and those at the end of the simulation are shown as thin lines and thick lines, respectively.
(Color online) ITG growth rate versus imposed flow shear amplitude for “V-shaped” flow profile.
(Color online) Gyrocentre flux versus radius, normalised to maximum heat flux, for V-shaped profiles, with R/LT = 6.94.
(Color online) Diffusivity versus large-scale shearing rate, , for simulations with an imposed V-shaped poloidal flow (a) and toriodal flow (b). Diamonds show initial and squares show averaged over the last half of the simulation. The parabola is the fit from 1, where a homogeneous flow was imposed.
(Color online) Profiles of temperature gradient fluctuations (thin line) and the radial derivative of the zonal potential (thick line) versus radius, averaged over the last 60a/cs of an ITG simulation without a heat source.
Article metrics loading...
Full text loading...