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

M. G. Shats*, W. M. Solomon

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    25 Citations (Scopus)

    Abstract

    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 lowconfinement mode (Shats M G and Solomon W M 2002 Phys. Rev. Lett. 88 045001). The structures modulate their parentwaves, 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.

    Original languageEnglish
    Article number330
    Pages (from-to)30.1-30.14
    JournalNew Journal of Physics
    Volume4
    DOIs
    Publication statusPublished - 29 May 2002

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