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- W2023369503 abstract "A common explanation is given for ion transport and strong broadband density fluctuations in tokamaks as a result of large anomalous electron transport near dominant magnetic surfaces (resp. in small magnetic islands). The main mechanism is local density flattening connected with an anomalous electron transport induced instationary radial electric field, which forces the ions via polarization drift to follow the electrons. For the density flattening process an exact solution of the time-dependent diffusion equation for a linear initial profile over the island width is used. From this we also derive an expression for a temporal growing radial electric field. This positive field reaches its maximum at the density plateau. Strong viscous diffusion or instability-induced transport between high and low electric field regions may now reverse the density flattening. Therefore relaxation oscillations result which may also explain the observed strong density and potential fluctuations in tokamaks. Several details of recent measurements of impurity ion behaviour and density fluctuations in tokamaks may be better explained with the theory given here." @default.
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- W2023369503 date "1986-01-01" @default.
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- W2023369503 title "Instationary Electric Fields, Ion Transport and Strong Density Fluctuations in Tokamaks with Dominant Anomalous Electron Transport" @default.
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- W2023369503 doi "https://doi.org/10.1002/ctpp.19860260108" @default.
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