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- W2187035010 abstract "Recurrent bursts of toroidicity-induced Alfven eigenmodes (TAE) are studied using a self-consistent simulation model. Bursts of beam ion losses observed in the neutral beam injection experiment at the Tokamak Fusion Test Reactor are reproduced using experimental parameters. Only co-injected beam ions build up to a significant stored energy even though their distribution is flattened in the plasma center. They are not directly lost as their orbits extend beyond the outer plasma edge when the core plasma leans on a high field side limiter. The time evolution of the beam ion density during a burst and the particle loss mechanism are presented. In the simulation, the distance to the limiter is decreased after the stored beam energy saturates. We show that the co-passing beam particles may not readily reach the limiter even if the orbit width of edge-located particles is larger than outer edge spacing between the limiter and plasma. For the parameters of this run the stored energy of the co-injected beam density only drops rapidly, after the gap width from the plasma edge to the limiter becomes less than 0.3 of the minor radius. The existence of KAM (Kolmogorov-Arnold-Moser) surfaces of the edge mode even at large field amplitudes apparently inhibits energetic co-passing particles from being lost to the limiter at larger gap widths." @default.
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- W2187035010 date "2011-02-23" @default.
- W2187035010 modified "2023-09-26" @default.
- W2187035010 title "Energetic Ion Transport due to Alfve?n Eigenmode Bursts" @default.
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- W2187035010 hasPublicationYear "2011" @default.
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