可激发辉光放电等离子体中鸭式诱导的混合模振荡
Canard-induced mixed mode oscillations in an excitable glow discharge plasmas
摘要：
实验研究了可激发辉光放电等离子体中鸭翼诱导的混合模振荡（MMO），并通过FHN模型的数值解验证了实验结果.当辉光放电等离子体被施加磁场扰动时，它表现出混合模式振荡活动，即，准周期小振荡插入大有界极限环振荡。随着磁场的增加，初始的准周期振荡转变为大振幅的极限环振荡，并且这种振荡的数量随着磁场的增加而增加。数值和实验结果的傅立叶分析表明，这些振荡的起源是鸭诱导的现象，这发生在控制参数的阈值附近。此外，相空间图也证实，振荡基本上是鸭诱导的MMO。
英文摘要：
We demonstrated experimentally canard induced mixed mode oscillations (MMO) in an excitable glow discharge plasma, and the results are validated through numerical solution of the FitzHugh Nagumo (FHN) model. When glow discharge plasma is perturbed by applying a magnetic field, it shows mixed mode oscillatory activity, i.e., quasiperiodic small oscillations interposed with large bounded limit cycles oscillations. The initial quasiperiodic oscillations were observed to change into large amplitude limit cycle oscillations with magnetic field, and the number of these oscillation increases with increase in the magnetic field. Fourier analysis of both numerical and experimental results show that the origin of these oscillations are canard-induced phenomena, which occurs near the threshold of the control parameter. Further, the phase space plots also confirm that the oscillations are basically canard-induced MMOs.
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