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Arc rotation measurement in a low-power plasma torch

In this work measurements of the arc rotation in a low-power plasma torch are described. The torch which is being developed for diamond synthesis operates with Ar/H2 mixtures at total pressures inside the expansion vessel of less than 5000 Pa and currents up to 14 A. A specific four-sectors anode arrangement was developed to measure the arc rotation. An external magnetic field, smaller than 80 G at the electrode region, was available to study its influence on the arc rotation. From the correlation technique applied to the current signals collected by the anode-sector angular rotation frequencies in the range 35-50 rad s-1 were measured.