Intrinsic noise induced coherence resonance in a glow discharge plasma

Abstract

Experimental evidence of intrinsic noise induced coherence resonance in a glow discharge plasma is being reported. Initially the system is started at a discharge voltage (DV) where it exhibited fixed point dynamics, and then with the subsequent increase in the DV spikes were excited which were few in number and with further increase of DV the number of spikes as well as their regularity increased. The regularity in the interspike interval of the spikes is estimated using normalized variance. Coherence resonance was determined using normalized variance curve and also corroborated by Hurst exponent and power spectrum plots. We show that the regularity of the excitable spikes in the floating potential fluctuation increases with the increase in the DV, up to a particular value of DV. Using a Wiener filter, we separated the noise component which was observed to increase with DV and hence conjectured that noise can play an important role in the generation of the coherence resonance. From an anharmonic oscillator equation describing ion acoustic oscillations, we have been able to obtain a FitzHugh-Nagumo like model which has been used to understand the excitable dynamics of glow discharge plasma in the presence of noise. The numerical results agree quite well with the experimental results.

Canard and mixed mode oscillations in an excitable glow discharge plasma in the presence of inhomogeneous magnetic field

“…The experimental results have been corroborated by a numerical simulation using a FitzHugh-Nagumo (FHN) like macroscopic model [4] derived from the basic plasma equations and phenomenology, where the noise has been included to represent the internal plasma noise. This macroscopic model shows MMO in the vicinity of the canard point when external noise is added.…”

α-stable noise-induced coherence on a spatially extended Fitzhugh–Nagumo system

“…Rosso and Masoller used information-theoretical complexity measurements to detect coherence resonance in FHN systems with Gaussian noise [12]. There are several other works having been done about coherence resonance in the FHN system with Gaussian noise [13][14][15].…”

Coherence resonance in an excitable potential well

“…This effect implies that noise-induced oscillations become more regular for an optimal value of the noise intensity. Coherence resonance is a frequent occurrence in neurodynamics [2,11,4,12] as well as in microwave [13] and semiconductor [14,15] electronics, optics [16,17,18,19,20], thermoacoustics [21], plasma physics [22], and chemistry [23,24,25].…”