PPPL-3539 is available in <a href="PPPL-3539.pdf">pdf</a> or 
<a href="PPPL-3539.ps">postscript</a> formats.

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<b>Energetic Particle Effects Can Explain the Low Frequency of Alfv&#233;n Modes in the DIII-D Tokamak</b>
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<b>Authors:</b> N.N. Gorelenkov and W.W. Heidbrink
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<b>Date of PPPL Report:</b> January 2001
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<b>Submitted to:</b> Physics of Plasmas
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During beam injection in the DIII-D tokamak, modes with lower frequencies than expected for toroidicity-induced Alfv&#233;n eigenmodes (TAE) are often observed. We present the analysis of one of these "beta-induced Alfv&#233;n eigenmodes" (BAE) with a high-n stability code HINST that includes the effect of the energetic ions on the mode frequency. It shows that the "BAE" could be the theoretically predicted resonant-TAE (RTAE), which is also called an energetic-particle mode (EPM).



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