Nonlinear evolution of two fast-particle-driven modes near the linear stability threshold
Journal article, 2011

A system of two coupled integro-differential equations is derived and solved for the non-linear evolution of two waves excited by the resonant interaction with fast ions just above the linear instability threshold. The effects of a resonant particle source and classical relaxation processes represented by the Krook, diffusion, and dynamical friction collision operators are included in the model, which exhibits different nonlinear evolution regimes, mainly depending on the type of relaxation process that restores the unstable distribution function of fast ions. When the Krook collisions or diffusion dominate, the wave amplitude evolution is characterized by modulation and saturation. However, when the dynamical friction dominates, the wave amplitude is in the explosive regime. In addition, it is found that the finite separation in the phase velocities of the two modes weakens the interaction strength between the modes.

clump pair creation

instabilities near-threshold

Author

J. Zalesny

West Pomeranian University of Technology

Grzegorz Galant

Chalmers, Earth and Space Sciences, Nonlinear electrodynamics

Mietek Lisak

Chalmers, Earth and Space Sciences, Nonlinear electrodynamics

S. Marczynski

West Pomeranian University of Technology

P. Berczynski

West Pomeranian University of Technology

A. Galkowski

Instytut Problemow Jadrowyc

S. Berczynski

West Pomeranian University of Technology

Physics of Plasmas

1070-664X (ISSN) 1089-7674 (eISSN)

Vol. 18 6 062109- 062109

Subject Categories

Physical Sciences

Roots

Basic sciences

DOI

10.1063/1.3601136

More information

Created

10/7/2017