5.直流放電におけるイオン音波の分岐とカオス(<小特集>プラズマに内在するカオスの新しいモデル)
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概要
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Bifurcations of an ion acoustic wave in a negatively charged plasma-sheath system are observed in a simulation using a convective scheme described by a two-dimensional phase space, and are theoretically analyzed. Subharmonics of a fundamental mode are excited and show chaotic spectra when the intensity of the ion source relating to the ionization is increased. A reversed electric field from the cathode to anode reveals that the ponderomotive force due to a high frequency mode pushes the ions toward the cathode. A nonlinear coupling of two modes(a fundamental and a high frequency mode)through the ponderomotive force is a key idea in the construction of model. Nonlinear dynamical model equations involving the coupling of the two modes and an interaction of the sheath with the two modes are proposed. The period-doubling bifurcations of the fundamental mode are examined by using the same growth rates with the flow velocity as in previously published linear theory.
- 2001-12-25