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Demonstration of Rapid Electrical Recovery in Repetitive Operation of a Counter-Facing Plasma-Focus Device

Tatsuya SODEKODA^1,2), Hajime KUWABARA²⁾, Masashi MASUDA¹⁾ and Kazuhiko HORIOKA¹⁾

1)

Department of Energy Sciences, Tokyo Institute of Technology, Midori-Ku, Yokohama 226-8502, Japan

2)

Research Laboratory, IHI Corporation, Isogo-Ku, Yokohama 235-8501, Japan

(Received 16 January 2017 / Accepted 19 January 2017 / Published 16 May 2017)

Abstract

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.

Copyright (c) 2017 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

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

DOI: 10.1585/pfr.12.1206021

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References

• [1] Y. Aoyama, M. Nakajima and K. Horioka, Phys. Plasmas 16, 110701 (2009).
• [2] T. Sodekoda, H. Kuwabara, M. Masuda et al., Proc. SPIE 9048, Extreme Ultraviolet Lithography V, 904824 (2014).
• [3] H. Kuwabara, T. Sodekoda, A. Tokuchi et al., IEEJ Transactions on Fundamentals and Materials, (submitted).