Correlation between Spatial Structure of Alfv6n Eigenmodes and Anoma lous Transport of Fast Ions

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Effects of toroidicity-induced Alfven eigenmodes on energetic-ion transport have been investigated in LHD plasmas heated by high-energy neutral beam injection. TAE-induced fast-ion losses were observed. The losses increase as the TAE fluctuation amplitude increases. The dependence of the observed TAE-induced fast-ion loss with respect to TAE fluctuation amplitude indicates that outward shift of a magnetic axis increases the anomalous fast-ion loss caused by TAE. This is supposed to be due to increase of orbit shift from flux surfaces and expansion of spatial distribution of TAEs in outward shifted plasmas.