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Dynamics of an excitable glow-discharge plasma under external forcing

Md. Nurujjaman*

A. N. Sekar Iyengar†

  • Centre for Applicable Mathematics, Tata Institute of Fundamental Research, Sharada Nagar, Chikkabommasandra, Bangalore 560065, India and Plasma Physics Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700064, India

  • Plasma Physics Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700064, India

  • *jaman_nonlinear@yahoo.co.in
  • †ansekar.iyengar@saha.ac.in
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Phys. Rev. E 82, 056210 – Published 19 November, 2010

DOI: https://doi.org/10.1103/PhysRevE.82.056210

Abstract

Glow discharge plasma in the excitable regime shows rich dynamical behavior under external forcing. By perturbing the plasma with a subthreshold sawtooth periodic signal, we obtained small subthreshold oscillations that showed resonance with the perturbation frequency. The resonance phenomenon can be useful to estimate characteristic of an excitable system. However, for suprathreshold perturbation, frequency entrainment was observed. In this case, the system showed harmonic frequency entrainment for the perturbation frequencies greater than the characteristic frequency of the system and the excitable behavior for the perturbation frequencies well below the characteristic frequency. The experiments were performed in a glow-discharge plasma where excitability was achieved at a suitable discharge voltage and gas pressure.

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Phys. Rev. E 82, 056210– Published 19 November, 2010
  • Received 30 June 2010

© 2010 American Physical Society

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