Physics
Scientific paper
Nov 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976phdt........25a&link_type=abstract
Ph.D. Thesis Royal Inst. of Tech., Stockholm (Sweden). Dept. of Electron Physics.
Physics
1
Electron Energy, Mercury Arcs, Plasma Probes, Velocity Measurement, Arc Discharges, Arc Welding, Energy Distribution, Plasma Sheaths, Velocity Distribution
Scientific paper
The construction of an apparatus for automatic determination of electron velocity distributions is described, and measurements of electron energy distributions before and after a stationary plasma sheath in a low pressure mercury discharge are presented. The sheath appears at a constriction of the discharge tube. The measurements were made with a spheric probe, using the second-derivative method, and the results show that the energy distribution on the anode side of the sheath is a sum of a thermal population and an accelerated distribution. Some measurements on a TIG (Triangular Inert Gas) welding arc are also described. Emitting probes were used to determine the potential distribution in the arc. In addition, measurements of the current-voltage characteristic of the arc, the current density, and the pressure at the anode were made. Gas streaming velocities along the axis were calculated.
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