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- W798718346 abstract "Results obtained by comparing experimental observations of core transport phenomena in ASDEX Upgrade and predictions based on the theory of core tokamak plasma microinstabilities are presented. In contrast to neoclassical transport, it is shown that turbulent transport does not involve mechanisms of strong central impurity accumulation, in agreement with the experimental observation that central accumulation can be suppressed by increasing the auxiliary central heating. Two main properties of the trapped electron mode turbulence, namely the existence of a threshold and the stabilization produced by collisions, are demonstrated experimentally. The strong link between ion heat transport and momentum transport is quantified experimentally by power balance analysis and found in agreement with gyrokinetic calculations for the ion temperature gradient modes. Strong confinement degradation is observed in low density plasmas, when auxiliary electron heating is added to dominant ion heating. It is shown that the related ion temperature drop is consistent with the reduction of the ion temperature gradient mode threshold due to the combined effects of both the increase of the electron to ion temperature ratio and the drop of the plasma toroidal rotation." @default.
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- W798718346 date "2007-01-01" @default.
- W798718346 modified "2023-09-23" @default.
- W798718346 title "Theoretical understanding of core transport phenomena in ASDEX Upgrade" @default.
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