Positive-streamer-like phenomena in point-plane corona gaps: Trichel pulses and high-pressure cathode sheath instabilities

Černák, Mirko; Hosokawa, Tatsuzo; Inoshima, Masayuki

doi:10.1063/1.103684

Cited by 15 publications

(14 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The higher the concentration of oxygen in the mixture was, the less pronounced the influence of ozone concentration was observed. In pure oxygen the current was stable in time within the range of current instabilities typical for the negative corona current [18], [19]. Combining the data from Fig.…”

Section: Resultsmentioning

confidence: 99%

Relaxing Phenomena in Negative Corona Discharge: New Aspects

Ráheľ

Pavlik

Holubcik

et al. 1999

Contrib. Plasma Phys.

View full text Add to dashboard Cite

Two theories, explaining the time dependence of the negative corona discharge current in air, are confronted with new experimental results. The influence of the ozone concentration on the discharge current was experimentally confirmed in dry air and in mixtures of nitrogen with oxygen. Assuming that only the dissociative electron attachment to ozone molecule is a process being responsible for a reduction of the electron component in the total mean discharge current, the mean value of the electron attachment rate constant k = (3 -5.5)x lo-' cm-3 s-l was derived from the measured dependence of the discharge current on the ozone concentration. The calculated value of the rate constant k corresponds to the dissociative attachment of electron to ozone molecule via process e + 0 3 + products (0-or 0; negative ions).

show abstract

Section: Resultsmentioning

confidence: 99%

Relaxing Phenomena in Negative Corona Discharge: New Aspects

Ráheľ

Pavlik

Holubcik

et al. 1999

Contrib. Plasma Phys.

View full text Add to dashboard Cite

show abstract

“…This paper is an extension of our previous work (Cernak and Hosokawa 1988a, 1988b, 1989Cernak et al 1990) and presents the results of measurements of the waveforms of the first Trichel pulses in pure CO2 and in CO2 with a small admixture of SF6 , as a function of applied voltage and gas pressure. The measurements were designed to ascertain the validity of Morrow's theoretical proposition regarding pulse shape formation and to provide a basis for modifying and extending the theory.…”

Section: Introductionmentioning

confidence: 88%

Negative Corona Current Pulses and Cathode Sheath Instabilities in a Short Point-Plane Gap in CO2

Černák¹,

Hosokawa²

1992

Aust. J. Phys.

View full text Add to dashboard Cite

Waveforms ofthe first negative corona current pulses have been measured in C02 and C02+SF6 mixtures as a function of applied voltage and gas pressure in the range 6�67-66�7 kPa. A complex form of the pulses with a step on the pulse leading edge and a current hump on the pulse trailing part has been found at gas pressures below 40 kPa. Changing the cathode surface material from copper to copper iodide, which has an exceptionally high photoelectric yield, resulted in at least a twofold increase in height of the step on the pulse leading edge, but had little effect on the main current rise to the pulse peak. The use of unconditioned cathodes resulted in the appearance of peculiar current spikes on the pulse tail, which are tentatively attributed to positive-streamer-like instabilities of the cathode sheath. The implications of these results for theories of Trichel pulse formation are discussed, and a physical picture of the phenomenon based on the presumed existence of a cathode-directed streamer associated with the steep pulse rise is outlined.

show abstract

“…1 It has been investigated extensively both from experiment and theories since it is first reported by Trichel. [2][3][4][5][6][7] At high pressure several hundreds of Torr to atmospheric pressure, one period of Trichel pulse consists of a very short rising times (several nanoseconds), a short durations times (tens of nanoseconds), and a longer times interval between pulses. 8,9 Because the rising times and duration times are too short, no experimental research has been done on the time-resolved discharge images of Trichel pulse.…”

Section: Introductionmentioning

confidence: 99%