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Author(s):
Todo, Y., Watanabe, T.-H., Park, H.-B., Sato, T.
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Title:
Fokker-Planck Simulation Study of Alfven Eigenmode Burst
Date of publication:
Sep. 2000
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Key words:
IAEA, fusion energy conference, Sorrento
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Abstract:
Recurrent bursts of toroidicity-induced Alfven eigenmodes (TAE) are reproduced with the Fokker-Planck-magnetohydrodynamic simulation where fast-ion source and slowing down are incorporated self-consistently. The bursts take place with a regular time interval and 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 fast ions. The system stays close to the marginal stability state established through the interplay of fast-ion source, slowing down, and TAE activity.
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