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(TH6/2) Fokker-Planck Simulation Study of Alfven Eigenmode Burst

Y. Todo¹⁾, T. Watanabe¹⁾, Hyoung-Bin Park¹⁾, T. Sato^1)
 
1) National Institute for Fusion Science

Abstract.  Recurrent bursts of toroidicity-induced Alfvén eigenmodes (TAEs) are reproduced with a Fokker-Planck-magnetohydrodynamic simulation where a fast-ion source and slowing down are incorporated self-consistently. The bursts take place at regular time intervals and the behaviors of all the TAEs are synchronized. The fast-ion transport due to TAE activity spatially broadens the classical fast-ion distribution and significantly reduces its peak value. Only a small change of the distribution takes place with each burst, leading to loss of a small fraction of the fast ions. The system stays close to the marginal stability state established through the interplay of the fast-ion source, slowing down, and TAE activity.

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