Nonlinear Splitting of Fast Particle Driven Waves in a Plasma: Observation and Theory
- 21 December 1998
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 81 (25) , 5564-5567
- https://doi.org/10.1103/physrevlett.81.5564
Abstract
The measured spectra of fast particle driven Alfvén eigenmodes in the JET tokamak plasma are interpreted on the basis of a nonlinear model of near-threshold kinetic instabilities. The observed mode splitting is a manifestation of the general nonlinear phenomena due to the combination of resonant wave-particle interaction and collisionlike relaxation of the resonant particles. The instability growth rate and the effective collision frequency of the resonant particles are determined.Keywords
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