Zonal flow generation in the improved confinement mode plasma and its role in confinement bifurcations

Details Zonal flow generation in the improved confinement mode plasma and its role in confinement bifurcations Zonal flow generation in the improved confinement mode plasma and its role in confinement bifurcations

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002njph....4...30s&link_type=abstract

New Journal of Physics, Volume 4, Issue 1, pp. 30 (2002).

Physics

22

Scientific paper

Unstable fluctuations develop in the initially quiescent plasma in the improved confinement mode of the H-1 heliac when the radial electric field (Er) shear exceeds some critical value. These unstable Er 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 Er 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.

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