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

研究了在高能中性束注入加热的LHD等离子体中，环态诱导的Alfven本征模对高能离子输运的影响。观察到了TAE引起的快离子损失。损耗随着TAE涨落幅度的增大而增大。观测到的TAE引起的快离子损失与TAE涨落幅度的关系表明，磁轴的外移增加了TAE引起的反常快离子损失。这可能是由于磁通面轨道移位的增加和外移等离子体中Te空间分布的扩展所致。

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.