Experimental study of a negative corona in atmospheric-pressure argon
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TEMPERATURE PLASMA
Experimental Study of a Negative Corona in Atmospheric-Pressure Argon G.-N. B. Dandarona and B. B. Baldanovb a East-Siberian
State University of Technology, Klyuchevskaya ul. 40-1, Ulan-Ude, Republic of Buryatia, 670013 Russia of Physical Problems at the Presidium of Buryat Science Center, Siberian Division, Russian Academy of Sciences, Ulan-Ude, Republic of Buryatia, 670047 Russia
b Department
Received May 17, 2006
Abstract—Results are presented from experimental studies of a negative point-to-plane dc corona in atmospheric-pressure argon. Several operating modes are identified: a hysteresis region, a repetitive mode, and a glow-discharge mode. The effect of gas-dynamic parameters on the characteristics of a repetitive negative corona is investigated. PACS numbers: 52.80.Hc DOI: 10.1134/S1063780X07030099
1. INTRODUCTION In recent years, corona discharges in air and some other gases have attracted increasing attention as a means of generating a nonequilibrium low-temperature atmospheric-pressure plasma. Interest in these studies stems from the wide field of application and a great variety of kinds of corona discharges [1–3]. Though corona discharges have long been studied, some mechanisms responsible for their development are still unclear. First of all, this concerns the negative corona, which is widely used in various gas-discharge devices [4]. In particular, a specific feature of the negative corona is its tendency to self-ordering, which manifests itself as so-called Trichel pulses [5]. In [6, 7], Trichel pulses were found to occur only in electronegative gases and self-oscillations of the negative corona current were attributed to the production of negative ions. In this context, studies [8–11] are of both fundamental and practical interest. In [8], a model capable of describing experimentally observed undamped current oscillations in a negative corona in air was developed. In [9], regular current (Trichel) pulses in a high-purity electropositive gas (nitrogen) were observed and the main properties of a negative corona were determined. The evolution of a corona with increasing current (up to its transformation into a spark) was described in [10]. In [11], the generation of current pulses during the negative half-period of a barrier corona discharge in pure argon was observed. Thus, it may be stated that the accumulation of experimental data on corona discharges and the development of relevant theoretical models are still in progress. The diversity of measurement data on negative corona discharges is related to their random spatial structure, which is difficult to resolve experimentally
[10], as well as to a large scatter between the results of different experiments [12, 13]. The development of a negative corona involves processes occurring on both nanosecond and microsecond time scales [14]. The most complicated problem is to study the cathode region (generation zone) of a negative corona [15–17]. In [18, 19], it was shown that the generation of current pulses in a low-current negative
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