Observation of modes at frequencies near the second Alfvén gap in TFTR

Details Observation of modes at frequencies near the second Alfvén gap in TFTR Observation of modes at frequencies near the second Alfvén gap in TFTR

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..485..112f&link_type=abstract

The thirteenth topical conference on radio frequency power in plasmas. AIP Conference Proceedings, Volume 485, pp. 112-115 (199

Computer Science

Theory, Design, And Computerized Simulation, Tokamaks, Spherical Tokamaks, Electromagnetic Waves, Plasma Heating By Particle Beams

Scientific paper

Modes have been observed near the frequency of the second Alfvén gap during off-axis H-minority heating experiments on TFTR. The observation of these modes is surprising in that the second gap, which is generally opened with ellipticity, is expected to be small, of order (r/R)2, since TFTR plasmas are circular in cross-section. A model is proposed in which the second gap is opened by the fast ion beta, which is shown to be able to introduce mode coupling, much as toroidal effects introduce mode coupling for Toroidal Alfvén Eigenmodes (TAE). The modes are seen with and without accompanying TAE mode activity.

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