Spatiotemporal Evolution of the Current and the Integral and Spectral Emission Characteristics of a Negative Corona in Nitrogen during Its Transformation into a Spark
- Troitsk Institute for Innovation and Fusion Research, Troitsk, Moscow oblast, 142190 (Russian Federation)
Results are presented from experimental studies of the conversion of a steady-state negative corona into a spark. It is found that a spark in a negative corona in nitrogen and air is formed in the absence of fast primary streamers. It is shown that, in atmospheric-pressure nitrogen, the conversion of a corona into a spark begins with the propagation of a plasma channel (secondary streamer) from the point electrode (cathode) to the plane electrode (anode). In contrast, the plasma channel in air originates near the plane electrode and then propagates towards the point electrode. The propagation velocity of the secondary streamer is very low, V = 10{sup 3}-10{sup 4} cm/s. Two possible scenarios of the formation of the spark channel in a negative corona in nitrogen are described on the basis of the concept of a contracted volume glow discharge. Results are presented from time-resolved spectral measurements of plasma emission from different regions of the corona during its transformation into a spark.
- OSTI ID:
- 20717475
- Journal Information:
- Plasma Physics Reports, Vol. 30, Issue 11; Other Information: Translated from Fizika Plazmy, ISSN 0367-2921, 30, 1044-1056 (No. 11, 2004); DOI: 10.1134/1.1825133; (c) 2004 MAIK ''Nauka / Interperiodica''; Country of input: International Atomic Energy Agency (IAEA); TN:; ISSN 1063-780X
- Country of Publication:
- United States
- Language:
- English
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