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Phys. Rev. Lett. 78, 2976–2979 (1997)

[Issue 15 – 14 April 1997 ]

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Alpha-Particle-Driven Toroidal Alfvén Eigenmodes in the Tokamak Fusion Test Reactor

R. Nazikian¹, G. Y. Fu¹, S. H. Batha², M. G. Bell¹, R. E. Bell¹, R. V. Budny¹, C. E. Bush¹, Z. Chang¹, Y. Chen¹, C. Z. Cheng¹, D. S. Darrow¹, P. C. Efthimion¹, E. D. Fredrickson¹, N. N. Gorelenkov³, B. Leblanc¹, F. M. Levinton², R. Majeski¹, E. Mazzucato¹, S. S. Medley¹, H. K. Park¹, M. P. Petrov⁴, D. A. Spong⁵, J. D. Strachan¹, E. J. Synakowski¹, G. Taylor¹, S. Von Goeler¹, R. B. White¹, K. L. Wong¹, and S. J. Zweben¹

¹Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543-0451

²Fusion Physics & Technology, Torrance, California 90503

³Troitsk Institute of Fusion and Innovative Research, Troitsk, Russia

⁴A. F. Ioffe Physical-Technical Institute, St. Petersburg, Russia

⁵Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831

Alpha-particle-driven toroidal Alfvén eigenmodes (TAEs) have been observed for the first time in deuterium-tritium (D-T) plasmas on the tokamak fusion test reactor (TFTR). These modes are observed 100–200 ms following the end of neutral beam injection in plasmas with reduced central magnetic shear and elevated central safety factor [q0>1]. Mode activity is localized to the central region of the discharge r/a<0.5 with magnetic fluctuation level B-tilde_perp/B_||~10^-5 and toroidal mode numbers in the range n = 2–4, consistent with theoretical calculations of alpha -TAE stability in TFTR.

©1997 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v78/p2976
DOI: 10.11.03/PhysRevLett.78.2976
PACS: 52.55.Fa, 52.35.Bj, 52.35.Py, 52.55.Pi

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