Numerical simulation of low pressure gas metal arc plasma

[摘要] In this paper the model of the cathode spot of a vacuum arc is considered in the framework of the drift-diffusion representation. It is shown that the main source of electrons, providing the current transport of vacuum arc, are ionization processes in the cathode zone, while the emission processes are an auxiliary source of initial electrons. The effects associated with the distribution of electron density in the plasma column of cathode spot, in particular the formation of a "plasma reaction zone" and "ionization wave", are discussed.

[发布机构] Siberian Federal University, Krasnoyarsk; 660041, Russia^1;Reshetnev Siberian State Aerospace University, Krasnoyarsk; 660037, Russia^2;Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk; 660036, Russia^3

[学科分类] 航空航天科学

[关键词] Auxiliary source;Current transport;Emission process;Ionization process;Ionization waves;Low pressure gas;Plasma reactions;Source of electrons