Energetic-Ion-Driven Toroidal Alfvén Eigenmodes Observed in a Heliotron/Torsatron Plasma

M. Takechi et al.
Phys. Rev. Lett. 83, 312 – Published 12 July 1999
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Abstract

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.

  • Received 15 October 1998

DOI:https://doi.org/10.1103/PhysRevLett.83.312

©1999 American Physical Society

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Vol. 83, Iss. 2 — 12 July 1999

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