Role of continuous discharge current for secondary streamer in water

H. Fujita, S. Kanazawa, K. Ohtani, A. Komiya, T. Kaneko, T. Sato

Research output: Contribution to journalArticlepeer-review


Ahighly spatiotemporal analysis of underwater secondary streamers was conducted through precise measurements. The secondary streamers were visualized both as formed gas channels and as luminescence with an exposure time of 20 ns at 40 Mega-frames per second (Mfps), synchronized with the discharge current. A continuous component appeared on the current waveforms when secondary streamers propagated with a velocity of about 25 km/s with continuous light emission. The streamers slowed down and the luminescence became intermittent during the following pulsed currents. The amount of accumulated electrical charges estimated from the current waveform was proportional to the total streamer length. These results show that the appearance of a continuous component on the discharge current waveform characterizes secondary streamer propagation and that secondary streamer propagation could be identified by the monitoring of current waveforms without any visualization.

Original languageEnglish
Pages (from-to)16-19
Number of pages4
JournalInternational Journal of Plasma Environmental Science and Technology
Issue number1
Publication statusPublished - 2016 Mar 1


  • Continuous discharge current
  • Secondary streamer
  • Spatiotemporal analysis
  • Underwater discharge


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