On Modelling the Transport Line when Covering the Current-Carrying Surface with Various Materials

Thick-walled tubes were used as a model of line nodes that are subjected to the greatest dynamic and energy loads. The formation of plasma on the surface of lead-coated and ceramic-coated electrodes was studied using shadow frame and streak photography. The linear current density was of the order of 1-3 MA/cm with a rise time of 100 ns. It is necessary to underline that the experiment was conducted in the absence of a source of powerful x-ray radiation. Numerical calculations were performed to simulate the processes that occur in a thick-walled tube when a current with a high linear density is passed through it. The results of numerical modeling of parameter evolution in such a linear density of 3MA/cm for steel cylindrical conductor with diameter of
_d
=
3mm and a wall thickness of 0.5 mm covered by lead foil is in good agreement with experiment.