Phys. Rev. Lett. 83, 312–315 (1999)Energetic-Ion-Driven Toroidal Alfvén Eigenmodes Observed in a Heliotron/Torsatron PlasmaReceived 15 October 1998; published in the issue dated 12 July 1999 Toroidal Alfvén eigenmodes (TAEs) of low toroidal mode number, n = 1 and 2, are observed in neutral-beam-heated plasmas in the compact helical system heliotron/torsatron. The observed frequency is proportional to the computed TAE frequency and lies near the lower bound of the innermost TAE gap. The modes are excited only when the beam velocity exceeds about half the central Alfvén velocity and when the net plasma current induced by coinjected neutral beams is in the required range. The modes are localized in the plasma core region, between 0.2 and 0.6 of the plasma minor radius. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.83.312
DOI:
10.1103/PhysRevLett.83.312
PACS:
52.35.Bj, 52.35.Py, 52.35.Qz, 52.55.Hc
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