Dynamics of ionization processes in high-pressure nitrogen, air, and SF6 during a subnanosecond breakdown initiated by runaway electrons View Full Text


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Article Info

DATE

2015-10

AUTHORS

V. F. Tarasenko, D. V. Beloplotov, M. I. Lomaev

ABSTRACT

The dynamics of ionization processes in high-pressure nitrogen, air, and SF6 during breakdown of a gap with a nonuniform distribution of the electric field by nanosecond high-voltage pulses was studied experimentally. Measurements of the amplitude and temporal characteristics of a diffuse discharge and its radiation with a subnanosecond time resolution have shown that, at any polarity of the electrode with a small curvature radius, breakdown of the gap occurs via two ionization waves, the first of which is initiated by runaway electrons. For a voltage pulse with an ∼500-ps front, UV radiation from different zones of a diffuse discharge is measured with a subnanosecond time resolution. It is shown that the propagation velocity of the first ionization wave increases after its front has passed one-half of the gap, as well as when the pressure in the discharge chamber is reduced and/or when SF6 is replaced with air or nitrogen. It is found that, at nitrogen pressures of 0.4 and 0.7 MPa and the positive polarity of the high-voltage electrode with a small curvature radius, the ionization wave forms with a larger (∼30 ps) time delay with respect to applying the voltage pulse to the gap than at the negative polarity. The velocity of the second ionization wave propagating from the plane electrode is measured. In a discharge in nitrogen at a pressure of 0.7 MPa, this velocity is found to be ∼10 cm/ns. It is shown that, as the nitrogen pressure increases to 0.7 MPa, the propagation velocity of the front of the first ionization wave at the positive polarity of the electrode with a small curvature radius becomes lower than that at the negative polarity. More... »

PAGES

832-846

References to SciGraph publications

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  • 1999-09. Effect of the rise rate of nanosecond high-voltage pulses on the breakdown of air gaps in TECHNICAL PHYSICS LETTERS
  • 2012-08. Spectra of X-ray emission from low-pressure gas discharge with runaway electrons in TECHNICAL PHYSICS LETTERS
  • 2013-07. Energy of electrons generated during a subnanosecond breakdown in atmospheric-pressure air in PLASMA PHYSICS REPORTS
  • 2014-08. Determination of the electron concentration and temperature, as well as the reduced electric field strength, in the plasma of a high-voltage nanosecond discharge initiated in atmospheric-pressure nitrogen by a runaway electron beam in TECHNICAL PHYSICS
  • 2008-01. Spatiotemporal parameters of the X-ray radiation from a diffuse atmospheric-pressure discharge in TECHNICAL PHYSICS
  • 2009-07. Radiative characteristics of nitrogen upon excitation by volume discharge initiated by runaway electron beam in OPTICS AND SPECTROSCOPY
  • 2012-01. The amplitude and current pulse duration of a supershort avalanche electron beam in air at atmospheric pressure in INSTRUMENTS AND EXPERIMENTAL TECHNIQUES
  • 2010-06. On the initiation of a spark discharge upon the breakdown of nitrogen and air in a nonuniform electric field in TECHNICAL PHYSICS
  • 2011-11. Soft X-ray generation and its role in breakdown of air gap at elevated pressures in TECHNICAL PHYSICS LETTERS
  • 2010-02. High-pressure runaway-electron-preionized diffuse discharges in a nonuniform electric field in TECHNICAL PHYSICS
  • 2011-05. Parameters of a supershort avalanche electron beam generated in atmospheric-pressure air in PLASMA PHYSICS REPORTS
  • 2011-08. On the influence of the voltage pulse rise time and cathode geometry on the generation of a supershort avalanche electron beam in TECHNICAL PHYSICS
  • 2012-01. Picosecond runaway electron beams in air in PLASMA PHYSICS REPORTS
  • 2010-03. Peculiarities of detecting pulses of runaway electrons and X-rays generated by high-voltage nanosecond discharges in open atmosphere in PLASMA PHYSICS REPORTS
  • Journal

    TITLE

    Plasma Physics Reports

    ISSUE

    10

    VOLUME

    41

    Author Affiliations

    Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1134/s1063780x15100098

    DOI

    http://dx.doi.org/10.1134/s1063780x15100098

    DIMENSIONS

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