Mutual relationship of adsorption processes on the surface of a cathode and the processes taking place in the parts of a heavy-current plasma discharge close to the electrodes

Autor: Karasev, V. N., Minyatov, A. V., Pankratov, V. G., Stepanov, V. N.
Zdroj: Journal of Applied Mechanics and Technical Physics; September 1972, Vol. 13 Issue: 5 p625-627, 3p
Abstrakt: The effect of alkali metal vapor on the work function of the cathode material in various MHD installations has as yet been little studied [1]. Nor has the mutual influence of adsorption processes on the cathode surface and processes taking place in the parts of a plasma discharge close to the electrodes, although this information is extremely vital in order to make a correct determination of the emission characteristics of cathodes in plasma. The manner in which the electrode becomes coated with the plasma material determines the work function of the electrode and thus the discharge current density and cathode potential drop ?s. On the other hand, the degree of coverage of the cathode with the adsorbed particles depends substantially on the value of ?s. In this paper we shall propose a method of calculating the emission characteristics of cathodes during a heavy-current plasma discharge allowing for the mutual influence of the processes in question. The problem is solved in a one-dimensional setting for an automatic thermionic-emission discharge (discharge of the “spotless” type).
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