5.ビーム・プラズマ系におけるカオス : 5.2 イオンビーム・プラズマ系の間欠性(<講座>プラズマにおけるカオス現象の観測と実験解析IV)

概要

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A broad band ion acoustic wave is generated in a controlled manner using a modulated ion beam in an ion beam-plasma system. The experimental results of the corresponding reaction in the double plasma device are reviewed. Specifically, the transition via intermittency is observed from a periodic state to a nonperiodic regime, where the frequency spectrum forms a broad band with a center frequency at around a half of the modulation frequency of the ion beam. The average power of the main mode having a frequency identical to the modulation frequency decreases as it propagates down along the plasma, showing the thermalization of the main mode, while the sub-harmonic waves grow up as ion acoustic modes. Strange at tractor, Poincare creation, and Lyapunov exponents are analyzed on the present modes, and their chaotic natures are shown.
社団法人プラズマ・核融合学会の論文
1997-10-25