Secondary effects on solid surfaces stimulated by the cathode plasma flux in vacuum arcs |
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Authors: | J Kutzner Z Załucki |
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Institution: | (1) Institute of Electric Power Engineering, Pozna University of Technology, 50-965 Pozna, Poland |
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Abstract: | The conducting plasma region between the electrodes of a vacuum arc contains single-and multiple-charged ions of the cathode material. Investigation into the behaviour of this flux when it impinges upon a surface should take into account secondary processes. From among various processes on the surface in vacuum arc, particular attention is paid to the sputtering of the surface and to the secondary electron emission by positive ions emitted from the cathode spots. On the basis of the sputtering yield characteristicsS
r as a function of ion kinetic energyE
i and their energy distribution in the cathode flux, the total sputtering yieldsS
re for atomicaly clean surface have been determined. Experimental verification ofS
re was performed by measuring the ratio of mass deposited on the collectors to mass carried by the particle incident flux. It was found that the calculated value ofS
re is comparable to the evaluated one from the experiments. The emission of secondary electrons from clean metal surfaces due to a bombardment by multiple-charged ions is considered. The secondary electron emission c depends on excess energyE
ex of incident ion and its average value av for multiple-charged ions depends both on the fractional distribution of ion flux zi and on the excess energyE
ex of each ion. It is proposed that the relationship derived is applicable to most combinations of atomic ions and pure metal surfaces.Presented at 17th Symposium Plasma Physics and Technology, Prague, June 13–16, 1995.This work was supported by the State Committee for Scientific Research within the research project No. 3P40101507. |
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