Measurements of the arc velocity and of the erosion rate are reported for a copper cathode. The 100 A arc, burning in nitrogen, is driven by a magnetic field B, varying from 5.1 to 171.0 mT, between concentric copper electrodes having an inter-electrode gap of 4 mm. The arc velocity varied with B 0.60 throughout the range investigated. The erosion rates dropped from 9.0 to 1.0 mu g C -1 as the arc velocity was increased from 15 to 135 m s -1 .
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Szente et al. (1988) studied this question.
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