Linearized treatment of electrode arc spot motion in a magnetic field

Analysis is carried out by considering the concentration of current in the arc spot as the final state in the growth of an instability. Linear perturbation theory is used to predict the properties of unstable waves in the plasma above an electrode, and the results are assumed to apply to the arc spo...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 1994-03, Vol.27 (3), p.547-554
Main Author: Simpson, S W
Format: Article
Language:English
Subjects:
Arcs, sparks, lightning
Electric discharges
Exact sciences and technology
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
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Summary:Analysis is carried out by considering the concentration of current in the arc spot as the final state in the growth of an instability. Linear perturbation theory is used to predict the properties of unstable waves in the plasma above an electrode, and the results are assumed to apply to the arc spot. Various features of the experimentally observed behaviour are predicted by the linearized treatment, including retrograde motion. This motion is caused by the Hall effect and a voltage-current characteristic with negative slope at the electrode sheath. (Original abstract-amended)
ISSN:0022-3727
1361-6463
DOI:10.1088/0022-3727/27/3/018