Description of Some Phenomena in Electric Arc Cathode Region

Pellerin, Stéphane; Musioł, K.; Pokrzywka, B.; Pawelec, E.; Richard, F.; Cormier, Jean Marie; Chapelle, J.

doi:10.1615/hightempmatproc.v1.i2.90

Cited by 2 publications

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“…Understanding and modelling of the nearcathode plasma physical state is not only based on the results of spectroscopic diagnosis, but also on real-time observations of this zone with a good temporal resolution. Results of a near-cathode region spectroscopic diagnosis have been described in our previous publications [4][5][6]8]. In this paper, we present the results of observations of the same plasma region, but now performed with a high time resolution.…”

Section: Introductionmentioning

confidence: 82%

“…Constriction of the plasma column was observed at a distance of up to about 3 mm from the cathode, which corresponds to the arc zone where axial dependence of the 696.543 nm ArI line norm intensity on the distance from the cathode was found [4][5][6]8].…”

Section: Plasma Columnmentioning

confidence: 87%

“…Details of our experimental set-up, procedures and results have been presented in previous publications [4][5][6]8]. The arc is shown in figure 1.…”

Section: Experimental Set-upmentioning

confidence: 99%

“…Some phenomena that were inexplicable within the LTE model, have been observed for various types of electric arc [e.g. [1][2][3][4][5][6][7]. For instance, the maximum value of the ArI spectral line emission coefficient (norm intensity) varies with distance from the cathode.…”

Section: Introductionmentioning

confidence: 99%

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Observations of electric arc cathode region

Pokrzywka

Pellerin

Musioł

et al. 1996

J. Phys. D: Appl. Phys.

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CCD camera images of the near-cathode region of an electric arc, working at atmospheric pressure in argon, permitted observation of some interesting phenomena that take place in this region, e.g. a `dark zone' in the cathode sheath region, low-frequency (f<0.1 Hz) fluctuations of discharge parameters and emitted light, the existence of several hot spots on the cathode surface, different kinds of movements of the arc spot on the cathode surface, and modification of the cathode surface structure.

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Section: Introductionmentioning

confidence: 82%

Section: Plasma Columnmentioning

confidence: 87%

“…Details of our experimental set-up, procedures and results have been presented in previous publications [4][5][6]8]. The arc is shown in figure 1.…”

Section: Experimental Set-upmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Observations of electric arc cathode region

Pokrzywka

Pellerin

Musioł

et al. 1996

J. Phys. D: Appl. Phys.

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Nonequilibrium phenomena and determination of plasma parameters in the hot core of the cathode region in free-burning arc discharges

Kühn

Kock

2007

Phys. Rev. E

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We present spectroscopic measurements of plasma parameters ͑electron density n e , electron temperature T e , gas temperature T g , underpopulation factor b͒ in the hot-core region in front of the cathode of a low-current, free-burning arc discharge in argon under atmospheric pressure. The discharge is operated in the hot-core mode, creating a hot cathode region with plasma parameters similar to high-current arcs in spite of the fact that we use comparatively low currents ͑less than 20 A͒. We use continuum emission and ͑optically thin͒ line emission to determine n e and T e . We apply relaxation measurements based on a power-interruption technique to investigate deviations from local thermodynamic equilibrium ͑LTE͒. These measurements let us determine the gas temperature T g . All measurements are performed side-on with charge-coupled-device cameras as detectors, so that all measured plasma parameters are spatially resolved after an Abel inversion. This yields the first ever spatially resolved observation of the non-LTE phenomena of the hot core in the near-cathode region of free-burning arcs. The results only partly coincide with previously published predictions and measurements in the literature.

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Description of Some Phenomena in Electric Arc Cathode Region

Cited by 2 publications

References 0 publications

Observations of electric arc cathode region

Observations of electric arc cathode region

Nonequilibrium phenomena and determination of plasma parameters in the hot core of the cathode region in free-burning arc discharges

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