Destabilizing Effect of Dynamical Friction on Fast-Particle-Driven Waves in a Near-Threshold Nonlinear Regime
- 12 May 2009
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 102 (19), 195003
- https://doi.org/10.1103/physrevlett.102.195003
Abstract
The nonlinear evolution of waves excited by the resonant interaction with energetic particles, just above the instability threshold, is shown to depend on the type of relaxation process that restores the unstable distribution function. When dynamical friction dominates over diffusion in the phase space region surrounding the wave-particle resonance, an explosive evolution of the wave is found to be the only solution. This is in contrast with the case of dominant diffusion when the wave may exhibit steady-state, amplitude modulation, chaotic and explosive regimes near marginal stability. The experimentally observed differences between Alfvenic instabilities driven by neutral beam injection and those driven by ion-cyclotron resonance heating are interpreted.This publication has 21 references indexed in Scilit:
- Chapter 5: Physics of energetic ionsNuclear Fusion, 2007
- Monitoring Alfvén Cascades with Interferometry on the JET TokamakPhysical Review Letters, 2004
- Spectroscopic determination of the internal amplitude of frequency sweeping TAEPlasma Physics and Controlled Fusion, 2004
- Chaotic Regime of Alfvén Eigenmode Wave-Particle InteractionPhysical Review Letters, 2000
- Chapter 5: Physics of energetic ionsNuclear Fusion, 1999
- Nonlinear Splitting of Fast Particle Driven Waves in a Plasma: Observation and TheoryPhysical Review Letters, 1998
- Spontaneous hole-clump pair creation in weakly unstable plasmasPhysics Letters A, 1997
- Critical nonlinear phenomena for kinetic instabilities near thresholdPhysics of Plasmas, 1997
- Nonlinear Dynamics of a Driven Mode near Marginal StabilityPhysical Review Letters, 1996
- A Model for Collision Processes in Gases. I. Small Amplitude Processes in Charged and Neutral One-Component SystemsPhysical Review B, 1954