Macroparticle mass transport, size distribution, and spatial distribution were studied in a 6. 5-MA/m**2 25-ms Cu multicathode-spot vacuum arc. The macroparticle erosion rate was determined to be 105 mu g/C, and together with ionic emission, accounted for most of the cathodic erosion. The number of macroparticles emitted decreased exponentially with macroparticle diameter, with 20-80- mu m macroparticles carrying the bulk of the mass transport. Macroparticles are emitted preferentially at an angle of 20 degree with respect to the cathode surface. In comparison to previous investigations, higher macroparticle erosion rates, a larger proportion of large macroparticles, and a higher emission angle are observed. The differences are attributed to the large current density used in the present experiment.
|Number of pages||5|
|State||Published - 1986|