Gyrofluid Simulation of Slab ITG Turbulence in Plasmas Including Pressure Profile Corrugation

概要

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Ion temperature gradient driven drift wave instability and turbulence are investigated based on a gyrofluid slab model in the presence of a pressure gradient corrugation (PPC). It is shown that the PPC cannot only stabilize or destabilize the ITG mode through local flattening or steepening of the radial pressure gradient, but most importantly also play a stabilizing role due to the global effect of the wave-type corrugation. The latter effect dominates in the highly corrugated cases and is identified to result from a nonlocal mode coupling in radial wave-number space, which scatters the spectra from unstable modes to high dissipation region. While the local stabilization/destabilization is stronger than the global stabilization in the cases with less corrugation, the global stabilization effect dominates the highly corrugated cases. Interestingly, it is found that the global stabilization of the PPC causes ion heat intermittency, which closely connects to the zonal flow dynamics.
社団法人プラズマ・核融合学会の論文