Strong density gradients in postdischarges in argon and air

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High current sparks are created in argon and air using a high-voltage pulse of 16-ns duration. Shadowgraphy is applied to image density fluctuations. Shock waves become visible $sim$ 100 ns after the pulse; they expand with a velocity somewhat higher than the speed of sound. The filamentary core of the discharge shows heating that diffuses outward slowly and develops into microturbulences. They remain visible up to 3 ms. In air, the current remains lower than that in argon, and shocks only emerge from the electrodes. No indication of absorption is found; probably gas heating is observed near the electrodes.
Original languageEnglish
Pages (from-to)2092-2093
Number of pages2
JournalIEEE Transactions on Plasma Science
Issue number11
Publication statusPublished - 2011


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