Nonlinear evolution of two fast-particle-driven modes near the linear stability threshold
Artikel i vetenskaplig tidskrift, 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

Författare

J. Zalesny

West Pomeranian University of Technology

Grzegorz Galant

Chalmers, Rymd- och geovetenskap, Icke-linjär elektrodynamik

Mietek Lisak

Chalmers, Rymd- och geovetenskap, Icke-linjär elektrodynamik

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

Ämneskategorier

Fysik

Fundament

Grundläggande vetenskaper

DOI

10.1063/1.3601136

Mer information

Skapat

2017-10-07