Numéro
J. Phys. IV France
Volume 07, Numéro C4, Octobre 1997
XXIIIrd ICPIG
XXIIIrd International Conference on Phenomena in Ionized gases
Page(s) C4-383 - C4-395
DOI https://doi.org/10.1051/jp4:1997431
EUROPEAN SYMPOSIUM ON MARTENSITIC TRANSFORMATION AND SHAPE MEMORY PROPERTIES

J. Phys. IV France 07 (1997) C4-383-C4-395

DOI: 10.1051/jp4:1997431

The Oscillations of the Positive Glow Corona

R.S. Sigmond

The Electron and Ion Physics Group, Physics Department, Norwegian University of Science and Technology, 7034 Trondheim, Norway


Abstract
The paper treats experiments, computer simulations, and the physical explanation of the oscillatory behaviour of positive glow coronas at or below atmospheric density. Experiments show that most positive glows have ionization regions that oscillate with frequencies depending on the gas, geometry, and average discharge current. Our circuit simulating program CIRCSIM with the general gas discharge element GPCS1 reproduces quantitatively Beattie's sphere-to-plane coronas in air, and also our cylindrical coronas in air and in argon with additives. The oscillations demand a fast secondary ionization (feedback) mechanism, and are damped or inhibited by slower feedback processes like positive ion or metastable feedback, and detachment from negative ions. Linear damped oscillations are due to ionization region capacitance and equivalent inductance. Nonlinear self-sustained oscillations are formed by periodic quenching by the generated positive ions.



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