Electron temperature in the expanding cathode plasma jet in a vacuum arc

摘要

The electron temperature distribution in the expanding plasma jet from the group spot in 2D approximation is calculated. The model considers spot currents of about 100 A and the spot (initial) electron temperature of about 2 eV. Effects of the self- and axial magnetic field are studied. Two cases, namely individual single jet from the cathode spot and high current column are considered. The calculations for both cases show that the plasma temperature increases by a factor of 1.5 in comparison to the initial electron temperature in the spot.