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23 Mar 2009

Volume 94, Issue 12, Articles (12xxxx)

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Appl. Phys. Lett. 94, 122502 (2009); http://dx.doi.org/10.1063/1.3100783 (3 pages)

Junhua Wang, Yisheng Shi, Juexian Cao, and Ruqian Wu
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Influence of a transverse magnetic field on arc root movements in a dc plasma torch: Diamagnetic effect of arc column

Keun Su Kim

Appl. Phys. Lett. 94, 121501 (2009); http://dx.doi.org/10.1063/1.3109782 (3 pages) | Cited 1 time

Online Publication Date: 27 March 2009

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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.
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52.75.Hn Plasma torches
52.25.Xz Magnetized plasmas
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