Experiments on ion cyclotron damping at the deuterium fourth harmonic in DIII-D

Details Experiments on ion cyclotron damping at the deuterium fourth harmonic in DIII-D Experiments on ion cyclotron damping at the deuterium fourth harmonic in DIII-D

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..485..144p&link_type=abstract

The thirteenth topical conference on radio frequency power in plasmas. AIP Conference Proceedings, Volume 485, pp. 144-147 (199

Computer Science

3

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

Scientific paper

Absorption of fast Alfvén waves by the energetic ions of an injected beam is evaluated in the DIII-D tokamak. Ion cyclotron resonance absorption at the fourth harmonic of the deuteron cyclotron frequency is observed with deuterium neutral beam injection (f=60 MHz, BT=1.9 T). Enhanced D-D neutron rates are evidence of absorption at the Doppler-shifted cyclotron resonance. Characteristics of global energy confinement provide further proof of substantial beam acceleration by the rf. In many cases, the accelerated deuterons cause temporary stabilization of the sawtooth (``monster sawteeth''), at relatively low rf power levels of ~1 MW.

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