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- W4297003611 abstract "Abstract This paper presents a comparative study of zonal flow screening in positive and negative triangularity tokamaks. Neoclassical screening sets the strength of zonal flow shear for fixed drive and damping. Orbit calculations show that the radial excursions of trapped particles are reduced in negative triangularity tokamaks, as compared to positive triangularity. Yet surprisingly, the neoclassical dielectric susceptibility actually increases with decreasing triangularity, such that the susceptibility is higher for negative triangularity than for positive triangularity. This is because the reduction in neoclassical polarization by shrinking the banana width is offset by the increase in neoclassical polarization by the enhancement of trapped fraction for negative triangularity. As a result, the zonal flow screening length is actually enhanced for negative triangularity, as compared to positive triangularity. Hence, the zonal flow residual is smaller for negative triangularity than for positive triangularity. Results from gyrokinetic simulations support the analytic calculations." @default.
- W4297003611 created "2022-09-25" @default.
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- W4297003611 date "2022-11-28" @default.
- W4297003611 modified "2023-10-10" @default.
- W4297003611 title "Zonal flow screening in negative triangularity tokamaks" @default.
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- W4297003611 doi "https://doi.org/10.1088/1741-4326/ac945e" @default.
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