Spots on electrodes and images of a gap during pulsed discharges in an inhomogeneous electric field at elevated pressures of air, nitrogen and argon

Tao Shao, Victor F. Tarasenko, Wenjin Yang, Dmitry V. Beloplotov, Cheng Zhang, Mikhail I. Lomaev, Ping Yan, Dmitry A. Sorokin

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Pulsed discharge in a nonuniform electric field accompanied by the appearance of bright spots due to explosive electron emission on electrodes has been investigated. The experiments were carried out using three experimental setups, a voltage pulse duration at a matched load of 2 ns, 40 ns, and 130 ns, respectively. Data on the formation of electrode spots during diffuse discharges in tube-plate or needle-plate gap configurations filled with gases at elevated pressures (air, nitrogen and argon) were obtained. It was found that in the air and other gases, bright spots arise on the flat electrode, and on the negative polarity of the electrode with a small radius of curvature, during the direction change of the current through the gap and the increase of the voltage pulse duration. It was shown that at the positive polarity of the electrode with a small radius of curvature, bright spots on the flat electrode arise due to the participation of the dynamic displacement current in the gap conductance.

Original languageEnglish
Article number054018
JournalPlasma Sources Science and Technology
Issue number5
Publication statusPublished - 1 Oct 2014
Externally publishedYes



  • electrode spot
  • nanosecond pulse discharge
  • nonuniform electric field

ASJC Scopus subject areas

  • Condensed Matter Physics

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