Journal
IEEE TRANSACTIONS ON PLASMA SCIENCE
Volume 40, Issue 11, Pages 2951-2960Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPS.2012.2211622
Keywords
Atmospheric-pressure plasma jets; glow-to-spark transition; high-pressure glow discharge
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Funding
- Russian Foundation for Basic Research [11-08-00671, 11-08-98033]
- Siberian Branch of the Russian Academy of Sciences [IM-126]
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This paper describes the investigation of an atmospheric-pressure glow discharge in air at a current of 0.05-0.3 A. Before the glow discharge is established, a preliminary nonsteady temporal stage is available in the gap. The principal process, which governs with the nonsteady-state discharge behavior, is the glow-to-spark transition phenomenon. The transition is initiated due to the explosive emission instability in the near-cathode layer of glow-type discharge that results in a microexplosion of the cathode surface and appearing of a spark cathode spot. At a low current, the spot is extinguished, so that the discharge starts burning again in one of the glow modes. After that, a new act of transition occurs and so on. The preliminary nonsteady-state stage ensures two prerequisites. First, an effective gas pressure decreases to a low value. Second, due to microexplosions, conditioning of the cathode surface is provided. Both factors facilitate establishing the normal glow discharge.
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