Abstract
A water plasma was generated by DC arc discharge between a hafnium cathode and a cupper anode. Arc fluctuation in the water plasma was examined by arc image observation synchronized with voltage measurement. Axial and radial extent of the arc was observed by high-speed camera. The effect of anode nozzle length was investigated to control the arc fluctuation. Radial extent of arc was suppressed when anode nozzle length increased. Therefore, available arc energy was increased when anode nozzle length was more than 7 mm. Decomposition rate of the treated material can be improved by arc control.
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