For the first time noncircular triangularity induced Alfv\'en eigenmodes (NAE) were observed in combined ion cyclotron resonance frequency and neutral beam injection heated plasmas. Ellipticity induced Alfv\'en eigenmodes (EAE) and toroidicity-induced Alfv\'en eigenmodes (TAE) were also observed in those plasmas. The threshold beta of the energetic ions for exciting the NAE modes was found to be similar to that for exciting TAE modes.
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Krämer et al. (1998) studied this question.
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