Anomalous Flattening of the Fast-Ion Profile during Alfvén-Eigenmode Activity
Physical Review Letters2007Vol. 99(24), pp. 245002–245002
Citations Over TimeTop 10% of 2007 papers
W. W. Heidbrink, Н. Н. Гореленков, Ying Luo, M. A. Van Zeeland, R. B. White, M. E. Austin, K.H. Burrell, G. Krämer, M. A. Makowski, G. R. McKee, R. Nazikian
Abstract
Neutral-beam injection into plasmas with negative central shear produces a rich spectrum of toroidicity-induced and reversed-shear Alfvén eigenmodes in the DIII-D tokamak. The first application of fast-ion D_{alpha} (FIDA) spectroscopy to Alfvén-eigenmode physics shows that the central fast-ion profile is anomalously flat in the inner half of the discharge. Neutron and equilibrium measurements corroborate the FIDA data. The current density driven by fast ions is also strongly modified. Calculations based on the measured mode amplitudes do not explain the observed fast-ion transport.
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