A self-consistent model for the cathode fall region of an electric arc

A one-dimensional model of the non-equilibrium plasma region adjacent to an electric arc cathode is developed. The collisionless space charge zone (sheath) and the hydrodynamically described ionization zone (pre-sheath) are connected to a unified model. This model yields the overall cathode potentia...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 1996-01, Vol.29 (1), p.121-128
Main Authors: Rethfeld, B, Wendelstorf, J, Klein, T, Simon, G
Format: Article
Language:English
Subjects:
Arcs, sparks, lightning
Electric discharges
Exact sciences and technology
Laboratory procedures
Metrology, measurements and laboratory procedures
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
Plasma applications
Plasma interactions (nonlaser)
Plasma-wall interactions
boundary layer effects
Plasma-wall interactions
boundary layer effects
plasma sheaths
Workshop procedures (welding, machining, lubrication, bearings, etc.)
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Summary:A one-dimensional model of the non-equilibrium plasma region adjacent to an electric arc cathode is developed. The collisionless space charge zone (sheath) and the hydrodynamically described ionization zone (pre-sheath) are connected to a unified model. This model yields the overall cathode potential drop (cathode fall), the extent of the non-equilibrium region and the net energy flux towards the cathode surface. As an example of its use, the model is applied to an argon arc plasma at atmospheric pressure with a thoriated tungsten cathode, typically used for welding of stainless steel. (Abstract uses original text)
ISSN:0022-3727
1361-6463
DOI:10.1088/0022-3727/29/1/021