Phys. Rev. Lett. 80, 2594–2597 (1998)Noncircular Triangularity and Ellipticity-Induced Alfvén Eigenmodes Observed in JT-60UReceived 19 February 1997; revised 1 May 1997; published in the issue dated 23 March 1998 For the first time noncircular triangularity induced Alfvén eigenmodes (NAE) were observed in combined ion cyclotron resonance frequency and neutral beam injection heated plasmas. Ellipticity induced Alfvén eigenmodes (EAE) and toroidicity-induced Alfvén 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. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.80.2594
DOI:
10.1103/PhysRevLett.80.2594
PACS:
52.35.Bj, 52.35.Hr, 52.35.Py, 52.55.Fa
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