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• W3209985887 abstract "Abstract The role of the edge stochastic layer on particle transport is addressed in DIII-D plasmas with applied resonant magnetic perturbations (RMPs) causing density pump-out (a term used to denote the density reduction at the top of the pedestal due to the applied RMPs). Using an analytical model that adds the stochastic parallel transport of electrons (Harvey et al 1981 Phys. Rev. Lett. 47 102) to the fluid equations, the ambipolar radial electric field and particle flux are calculated simultaneously. In this model the nonambipolar electron particle flux, driven by the stochastic magnetic field, is predominantly balanced by the nonambipolar perpendicular ion flux, driven by toroidal viscosity, across a narrow stochastic layer of order two percent of the plasma radius (0.98 < ψ n < 1). The model reproduces the level of density pump-out and its dependence on RMP amplitude near the separatrix for three plasma discharges for which the pedestal foot is at medium to high collisionality <?CDATA $(2leqslant {nu }_{text{sep}}^{ast }leqslant 30)$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline overflow=scroll> <mml:mrow> <mml:mo stretchy=false>(</mml:mo> <mml:mrow> <mml:mn>2</mml:mn> <mml:mo>⩽</mml:mo> <mml:msubsup> <mml:mrow> <mml:mi>ν</mml:mi> </mml:mrow> <mml:mrow> <mml:mtext>sep</mml:mtext> </mml:mrow> <mml:mrow> <mml:mo>*</mml:mo> </mml:mrow> </mml:msubsup> <mml:mo>⩽</mml:mo> <mml:mn>30</mml:mn> </mml:mrow> <mml:mo stretchy=false>)</mml:mo> </mml:mrow> </mml:math> . The experimentally observed and numerically tested inverse density dependence of density pump-out (Hu et al 2020 Nucl. Fusion 60 076001) is accurately captured by the model: an increase in collisionality with density in the pedestal foot results in a decrease in stochastic diffusivity, and hence a decrease in the level of pump-out." @default.
• W3209985887 created "2021-11-08" @default.
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• W3209985887 date "2022-04-26" @default.
• W3209985887 modified "2023-10-02" @default.
• W3209985887 title "Role of the edge stochastic layer in density pump-out by resonant magnetic perturbations" @default.
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• W3209985887 doi "https://doi.org/10.1088/1741-4326/ac61ba" @default.
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