Computer Science
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..485..108b&link_type=abstract
The thirteenth topical conference on radio frequency power in plasmas. AIP Conference Proceedings, Volume 485, pp. 108-111 (199
Computer Science
Theory, Design, And Computerized Simulation, Tokamaks, Spherical Tokamaks
Scientific paper
Experiments with plasma heating by waves at the ion cyclotron resonance of a minority species have shown that the heating efficiency degrades above a certain power threshold. It is found that this threshold is due to the destabilization of shear Alfvén waves, which causes loss of fast ions. There are two distinct regimes characterized by low qa and high qa. In the first case, the fast ion distribution created by ICRF, lies entirely inside rq=1, away from the location of global TAE. This situation leads to the formation of a very strong fast ion population which stabilizes the sawteeth, but also excites Energetic Particle Modes (EPM), which transport fast ions outside rq=1 causing the giant crash. At higher qa, the widening of the Alfvén gap due to the steeper q profile, brings the global TAE ``in contact'' with the fast ion distribution. This results in an immediate and continuous depletion of fast ions from the core, which prevents the formation of the monster sawtooth and the excitation of EPM.
Bernabei Stefano
Budny R.
Fredrickson E. D.
Gorelenkov Nikolai
Hosea J. C.
No associations
LandOfFree
Role of Alfvén instabilities in energetic ion transport does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Role of Alfvén instabilities in energetic ion transport, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Role of Alfvén instabilities in energetic ion transport will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1767697