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- W2904130724 abstract "From global gyrokinetic simulations of toroidal ion temperature gradient-driven turbulence, we show that the ion parallel compression has a strong influence on the generation and radial profile formation of zonal flows. The kinetic potential vorticity (PV) flux and its fluid expression are used to elucidate the zonal flow generation mechanism. In the absence of sheared equilibrium flow, the dominant contributions to the net PV flux are shown to come from the parallel compression and the grad-B drift, and to largely cancel out each other. With a finite parallel rotation shear, however, the parallel compression-driven flux becomes dominant over the grad-B drift-driven one, leading to a change in the radial zonal flow profile. The imbalance between the parallel compression and the grad-B drifts results in a considerable amplification of the zonal flow and a reduction of turbulence fluctuation levels as compared to the non-rotating plasma. These findings demonstrate an essential role of the parallel compression in the zonal flow generation and confinement improvement for rotating tokamak plasmas." @default.
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- W2904130724 date "2019-01-17" @default.
- W2904130724 modified "2023-09-26" @default.
- W2904130724 title "Role of parallel compression in potential vorticity mixing and zonal flow generation: a gyrokinetic simulation study" @default.
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- W2904130724 doi "https://doi.org/10.1088/1741-4326/aaf9d3" @default.
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