Dynamics of the spatial structure of pulsed discharges in dense gases in point cathode−plane anode gaps and their erosion effect on the plane electrode surface

Journal Article · Thu Sep 15 04:00:00 EDT 2016 · Plasma Physics Reports

DOI:https://doi.org/10.1134/S1063780X16090014· OSTI ID:22614085

Baksht, E. Kh. ^[1]; Blinova, O. M. ^[2]; Karelin, V. I. ^[2]; Ripenko, V. S.; Tarasenko, V. F. ^[1]; Trenkin, A. A.; Shibitov, Yu. M. ^[2]; Shulepov, M. A. ^[1]

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1. Russian Academy of Sciences, Institute of High Current Electronics, Siberian Branch (Russian Federation)
2. Russian Federal Nuclear Center All-Russian Research Institute of Experimental Physics (Russian Federation)

The dynamics of the spatial structure of the plasma of pulsed discharges in air and nitrogen in a nonuniform electric field and their erosion effect on the plane anode surface were studied experimentally. It is established that, at a nanosecond front of the voltage pulse, a diffuse discharge forms in the point cathode–plane anode gap due to the ionization wave propagating from the cathode. As the gap length decreases, the diffuse discharge transforms into a spark. A bright spot on the anode appears during the diffuse discharge, while the spark channel forms in the later discharge stage. The microstructure of autographs of anode spots and spark channels in discharges with durations of several nanoseconds is revealed. The autographs consist of up to 100 and more microcraters 5–100 μm in diameter. It is shown that, due to the short duration of the voltage pulse, a diffuse discharge can be implemented, several pulses of which do not produce appreciable erosion on the plane anode or the soot coating deposited on it.

• OSTI ID: 22614085
• Journal Information: Plasma Physics Reports, Journal Name: Plasma Physics Reports Journal Issue: 9 Vol. 42; ISSN PPHREM; ISSN 1063-780X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
AIR
ANODES
CATHODES
COATINGS
ELECTRIC DISCHARGES
ELECTRIC FIELDS
ELECTRIC POTENTIAL
EROSION
IONIZATION
MICROSTRUCTURE
NITROGEN
PLASMA
SOOT
SURFACES