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首页> 外文期刊>Plasma and Fusion Research >Study on Dynamic Behaviors of Ionization Waves Influenced by Feedback in a Glow Discharge Plasma
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Study on Dynamic Behaviors of Ionization Waves Influenced by Feedback in a Glow Discharge Plasma

机译：辉光放电等离子体中受反馈影响的电离波的动态行为研究

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Dynamic behaviors of ionization waves influenced by feedback are experimentally studied. Delayed feedback is useful for stabilization of chaotic system; it has applicability in controlling chaos. However, delayed feedback can also result in a stable system becoming unstable, or even chaotic. The ionization wave system in our experiment has one spatial degree of freedom. Neon gas is introduced into a glass tube that has been evacuated to high vacuum, and a glow discharge Ne plasma is produced by an electric current between two electrodes. Fluctuations in the light intensity are sampled using two photodiodes placed a certain distance apart; the intensity sampled from one photodiode is fed back to the system through an external circuit. The largest Lyapunov exponents are calculated from the time series sampled from the photodiodes. The value of the largest Lyapunov exponent is positive for chaotic oscillations, with higher values for more chaotic systems. The value becomes close to zero for a system with periodic oscillations. In our studies, we found that a chaotic system can be made periodic by applying feedback while the distance between two photodiodes is a multiple of a particular value.
机译：实验研究了电离波受反馈影响的动态行为。延迟反馈对于稳定混沌系统很有用。它具有控制混乱的适用性。但是，延迟的反馈也可能导致稳定的系统变得不稳定甚至混乱。我们实验中的电离波系统具有一个空间自由度。将氖气引入已抽至高真空的玻璃管中，并通过两个电极之间的电流产生辉光放电Ne等离子体。使用两个相距一定距离的光电二极管对光强度的波动进行采样。从一个光电二极管采样的强度通过外部电路反馈到系统。最大Lyapunov指数是根据从光电二极管采样的时间序列计算得出的。最大Lyapunov指数的值对于混沌振荡是正的，对于更多的混沌系统则值较高。对于具有周期性振荡的系统，该值接近于零。在我们的研究中，我们发现当两个光电二极管之间的距离是特定值的倍数时，可以通过应用反馈使混沌系统具有周期性。

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