Polarity effect and its inversion in nanosecond-pulse breakdown of dense gases

M. I. Lomaev, V. F. Tarasenko, D. V. Beloplotov, T. Shao, C. Zhang

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

The breakdown of gas gaps in an inhomogeneous electric field at subnanosecond and nanosecond voltage pulse rise times are studied, and the famous polarity effect in pointto- plane gaps is investigated. It is shown that, the inversion of the polarity effect takes place not only in electronegative gases such as SF6, but also occurs in electropositive nitrogen and in air. It is found that with a voltage pulse rise time of ~0.5 ns, the inversion of the polarity effect occurs at SF6 and SF6-N2 pressures of 0.25 MPa and lower, at air pressure up to 0.3 MPa and with a voltage pulse rise time of 15 ns, at a SF6 pressure lower than 0.12 MPa. The inversion of the polarity effect is related to a delay of electron emission from the plane cathode on arrival of the ionization wave front anode to the cathode. In addition, both the inverted and the ordinary polarity effects were not observed at the breakdown of nitrogen at pressures of 0.4 and 0.7 MPa.

Original languageEnglish
Title of host publicationGeneration of Runaway Electron Beams and X-Rays in High Pressure Gases, Volume 2
Subtitle of host publicationProcesses and Applications
PublisherNova Science Publishers, Inc.
Pages233-255
Number of pages23
ISBN (Electronic)9781634858489
ISBN (Print)9781634858342
Publication statusPublished - 1 Jan 2016
Externally publishedYes

Keywords

  • Gas discharge
  • High-voltage nanosecond discharge
  • Inverted polarity effect
  • Ionization wave
  • Nanosecond pulse
  • Nitrogen
  • Polarity effect
  • SF
  • Subnanosecond breakdown

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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  • Cite this

    Lomaev, M. I., Tarasenko, V. F., Beloplotov, D. V., Shao, T., & Zhang, C. (2016). Polarity effect and its inversion in nanosecond-pulse breakdown of dense gases. In Generation of Runaway Electron Beams and X-Rays in High Pressure Gases, Volume 2: Processes and Applications (pp. 233-255). Nova Science Publishers, Inc..