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Emphasis of Periodicity in the Dynamic Behavior of Ionization Waves

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Title: Emphasis of Periodicity in the Dynamic Behavior of Ionization Waves
Authors: Fukuyama, Takao / Yamaguchi, Rina / Kanzaki, Hiroki
Issue Date: 2-Jul-2020
Publisher: プラズマ・核融合学会 / The Japan Society of Plasma Science and Nuclear Fusion Research
Citation: Plasma and Fusion Research, 15, 2401049; 2020
Abstract: The dynamic behavior of ionization waves in glow discharge plasma was examined, particularly with regard to periodicity. In a series of experiments, neon plasma was produced by the glow discharge between two electrodes after the glass tube was evacuated to high vacuum. Fluctuations in the light intensity were sampled with a line-scan camera and photodiodes as spatiotemporal signals for data analysis. The largest Lyapunov exponents were calculated from the time series of the experimental samples to quantitatively estimate the complexity of the system. The signal-to-noise ratio (SNR) became saturated as the intensity of the external force applied to the chaotic state was gradually increased because chaotic oscillations in the ionization wave synchronized to the external force. A periodic orbit in the chaos system was emphasized, and the oscillation became coherent as the state SNR reached its maximum value. When the periodicity was emphasized, the oscillation became coherent not only in time but also in space. Periodicity was also observed in system-induced feedback without an external force. Similar results were obtained with an external force and feedback; however, the former caused the chaos system to synchronize with the external force, while the latter yielded periodic oscillations from the chaos-chaos interaction.
Keywords: glow discharge / ionization wave / chaos / periodicity / synchronization
URI: http://hdl.handle.net/10069/40152
ISSN: 18806821
DOI: 10.1585/pfr.15.2401049
Rights: © 2020 The Japan Society of Plasma Science and Nuclear Fusion Research
Type: Journal Article
Text Version: publisher
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/40152

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