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

Kim, Keun Su
March 2009
Applied Physics Letters;3/23/2009, Vol. 94 Issue 12, p121501
Academic Journal
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.


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