The interaction process between the interelectrode plasma and macroparticles (droplets) produced by a multitude of cathode spots in a vacuum arc between metallic electrodes has important significance in several technological areas such as high current switching and electrical power systems circuit protection. We have therefore performed, for the first time, an experimental investigation by use of Laser Doppler Anemometry (LDA) in the interelectrode plasma of the multi-cathode-spot vacuum arc generated between several metallic electrodes, covering a wide range of thermal properties. The LDA system was designed to measure particle velocities of up to 200 m/s and included a set of optical filters to block the emitted light from the plasma radiation.
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|Published - 1985