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

We report on the experimental observation of canard orbit and mixed mode oscillations (MMOs) in an excitable glow discharge plasma induced by an external magnetic field perturbation using a bar magnet. At a small value of magnetic field, small amplitude quasiperiodic oscillations were excited, and w...

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Bibliographic Details
Published in:Physics of plasmas 2015-12, Vol.22 (12)
Main Authors: Shaw, Pankaj Kumar, Sekar Iyengar, A. N., Nurujjaman, Md
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
AMPLITUDES
Computer simulation
COMPUTERIZED SIMULATION
DISTURBANCES
EQUATIONS
Field strength
GLOW DISCHARGES
Macroscopic models
MAGNETIC FIELDS
Mathematical models
NOISE
Nonlinear phenomena
NONLINEAR PROBLEMS
ORBITS
OSCILLATION MODES
Oscillations
Phenomenology
PLASMA
Plasma physics
PLASMA SIMULATION
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Summary:We report on the experimental observation of canard orbit and mixed mode oscillations (MMOs) in an excitable glow discharge plasma induced by an external magnetic field perturbation using a bar magnet. At a small value of magnetic field, small amplitude quasiperiodic oscillations were excited, and with the increase in the magnetic field, large amplitude oscillations were excited. Analyzing the experimental results, it seems that the magnetic field could be playing the role of noise for such nonlinear phenomena. It is observed that the noise level increases with the increase in magnetic field strength. The experimental results have also been corroborated by a numerical simulation using a FitzHugh-Nagumo like macroscopic model 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 an external noise is added.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.4936800