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Nonlinear evolution of two fast-particle-driven modes near the linear stability threshold

J. Zalesny ; Grzegorz Galant (Institutionen för rymd- och geovetenskap, Icke-linjär elektrodynamik) ; Mietek Lisak (Institutionen för rymd- och geovetenskap, Icke-linjär elektrodynamik) ; S. Marczynski ; P. Berczynski ; A. Galkowski ; S. Berczynski
Physics of Plasmas (1070-664X). Vol. 18 (2011), 6, p. 062109.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: instabilities near-threshold, clump pair creation



Denna post skapades 2011-08-09. Senast ändrad 2015-07-08.
CPL Pubid: 143923

 

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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Icke-linjär elektrodynamik (2010-2012)

Ämnesområden

Fysik

Chalmers infrastruktur

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Nonlinear Evolution of Plasma Modes Driven by Fast Particles in Tokamaks