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Title: 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 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.
Authors:
;  [1] ;  [2]
  1. Plasma Physics Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700064 (India)
  2. Department of Physics, National Institute of Technology Sikkim, Ravangla, Sikkim 737139 (India)
Publication Date:
OSTI Identifier:
22489920
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMPLITUDES; COMPUTERIZED SIMULATION; DISTURBANCES; EQUATIONS; GLOW DISCHARGES; MAGNETIC FIELDS; NOISE; NONLINEAR PROBLEMS; ORBITS; OSCILLATION MODES; PLASMA; PLASMA SIMULATION