abstract_PRL155001_Xia_shats
Zonal flow generation in the improved confinement mode plasma and
its role in confinement bifurcations.
M.G. Shats MG and W.M. Solomon New Journal of Physics, vol.4, 2002.
Abstract: Unstable fluctuations develop in the initially quiescent plasma in the improved confinement mode of the H-1 heliac when the radial electric field (E/sub r/) shear exceeds some critical value. These unstable E/sub r/ shear-driven modes are shown to generate zonal-flow-like poloidally symmetric potential structures, similar to those generated in the low confinement mode (Shats M G and Solomon W M 2002 Phys. Rev. Lett. 88 045001). The structures modulate their parent waves, the background E/sub r/ shear and the fluctuation-driven radial transport. The onset of zonal flows is observed as a precursor to the plasma confinement bifurcation to an even higher confinement regime.
M.G. Shats MG and W.M. Solomon New Journal of Physics, vol.4, 2002.
Abstract: Unstable fluctuations develop in the initially quiescent plasma in the improved confinement mode of the H-1 heliac when the radial electric field (E/sub r/) shear exceeds some critical value. These unstable E/sub r/ shear-driven modes are shown to generate zonal-flow-like poloidally symmetric potential structures, similar to those generated in the low confinement mode (Shats M G and Solomon W M 2002 Phys. Rev. Lett. 88 045001). The structures modulate their parent waves, the background E/sub r/ shear and the fluctuation-driven radial transport. The onset of zonal flows is observed as a precursor to the plasma confinement bifurcation to an even higher confinement regime.
