Plasma and Fusion Research

Volume 12, 1206021 (2017)

Rapid Communications

Demonstration of Rapid Electrical Recovery in Repetitive Operation of a Counter-Facing Plasma-Focus Device
Tatsuya SODEKODA1,2), Hajime KUWABARA2), Masashi MASUDA1) and Kazuhiko HORIOKA1)
Department of Energy Sciences, Tokyo Institute of Technology, Midori-Ku, Yokohama 226-8502, Japan
Research Laboratory, IHI Corporation, Isogo-Ku, Yokohama 235-8501, Japan
(Received 16 January 2017 / Accepted 19 January 2017 / Published 16 May 2017)


Two plasma-focus electrodes, consisting of a pair of counter-facing center electrodes surrounded by six outer electrodes, can sustain a long-life, high-energy-density (HED) plasma initiated by laser-triggered multi-channel discharges. With the goal of making a high-average-power plasma device, we investigated the repetition rate of this device. Double-pulse experiments showed that when the device was driven with positive polarity, in which the center electrodes were biased at a positive voltage, the time required for the device to return to a non-conducting state was less than 100 μs, regardless of the operating voltage. The device thus has a repetition rate of more than 10 kHz.


plasma focus, multi-channel electrode, pulsed discharge, electric recovery, lithium plasma

DOI: 10.1585/pfr.12.1206021


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