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Influence of a transverse magnetic field on arc root movements in a dc plasma torch: Diamagnetic effect of arc column

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1 Author(s)
Kim, Keun Su ; Department of Chemical Engineering, Université de Sherbrooke, Blvd. de l’Université, Sherbrooke, Quebec J1K 2R1, Canada

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The effect of a transverse magnetic field on the anodic arc root movement inside a dc plasma torch has been investigated. The arc voltage fluctuation, which represents the degree of the arc instability, was reduced to 28.6% of the original value and the high frequency components in the voltage signal also decreased in their magnitudes. The inherent arc instability in a dc thermal plasma torch seems to be suppressed by a diamagnetic effect of the arc column. Furthermore, the measured voltage wave forms indicated that the arc root attachment mode would be controllable by a transverse magnetic field.

Published in:

Applied Physics Letters  (Volume:94 ,  Issue: 12 )