Volume 105, Number 1, January 2014
|Number of page(s)||5|
|Section||Physics of Gases, Plasmas and Electric Discharges|
|Published online||31 January 2014|
Fast propagation of an underwater secondary streamer by the appearance of a continuous component in the discharge current
1 Institute of Fluid Science, Tohoku University - 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
2 Department of Electrical and Electronic Engineering, Oita University - 700 Dannoharu, Oita 870-1192, Japan
3 Department of Electronic Engineering, Tohoku University - 6-6-05 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan
Received: 7 November 2013
Accepted: 3 January 2014
An underwater secondary streamer for a single-shot pulsed positive voltage was found to propagate with an average velocity of 18 km/s during the appearance of a continuous component on the discharge current waveform. The continuous component was the first discharge current with a direct-current–like component detected after a displacement current. However, the propagation velocity decreased to less than 2 km/s during the appearance of pulsed currents, which followed the continuous component. These results were analyzed by highly spatiotemporal visualization synchronized with the discharge current.
PACS: 52.80.Wq – Discharge in liquids and solids / 52.20.-j – Elementary processes in plasmas / 52.70.-m – Plasma diagnostic techniques and instrumentation
© EPLA, 2014
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