Nonlinear Sciences – Chaotic Dynamics
Scientific paper
2004-06-28
Nonlinear Sciences
Chaotic Dynamics
LATEX, 4 pages, 4 figures
Scientific paper
The chaotic dissipative dynamics of a charged particle in the field of three plane waves is theoretically (Melnikov's method) and numerically (Lyapunov exponents) investigated. In particular, the effectiveness of one of such waves in controlling the chaotic dynamics induced by the remaining two waves is theoretically predicted and numerically confirmed. Two mechanisms underlying the chaos-suppression scenario are identified. One mechanism requires chaos-inducing and chaos-suppressing waves to have both commensurate wavelengths and commensurate relative (with respect to the remaining third wave) phase velocities, while the other mechanism allows the chaotic dynamics to be tamed when such quantities are incommensurate. The present findings may be directly applied to several important problems in plasma physics, including that of the chaos-induced destruction of magnetic surfaces in tokamaks.
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