Transient spark – DC driven nanosecond pulsed discharge in atmospheric air
Janda M., Niklová A., Martišovitš V., and Machala Z.
HAKONE XII, Trenčianske Teplice, September 12-17, p. 69-73 (2010)
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Abstract: We introduce a DC-driven pulsed discharge named transient spark (TS): a repetitive streamer-to-spark transition discharge with short spark duration (~10-100 ns), based on charging and discharging of internal capacity C of the reactor with repetition frequency f ≈ 1-10 kHz. TS generates very reactive non-equilibrium air plasma and is applicable for flue gas cleaning, bio-decontamination or other applications, since it can be maintained at relatively low energy conditions (0.1-1 mJ/pulse). Streamer-to-spark transition is governed by the increase of the gas temperature Tg in the plasma channel. Initial Tg at the beginning of the streamer is ~300 K, though it increases with frequency up to ~450 K at 10 kHz. The transition to spark occurs at ~1000 K. This heating accelerates with increasing f, leading to a decrease of the average streamer-to-spark transition time from a few μs to less than 100 ns.
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