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Publication
Modelling current transfer to cathodes in metal halide plasmas
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Advisor(s)
Abstract(s)
This work is concerned with investigation of the main features of current
transfer to cathodes under conditions characteristic of metal halide (MH)
lamps. It is found that the presence of MHs in the gas phase results in a
small decrease of the cathode surface temperature and of the near-cathode
voltage drop in the diffuse mode of current transfer; the range of stability of
the diffuse mode expands. Effects caused by a variation of the work function
of the cathode surface owing to formation of a monolayer of alkali metal
atoms on the surface are studied for particular cases where the monolayer
is composed of sodium or caesium. It is found that the formation of the
sodium monolayer affects the diffuse mode of current transfer only
moderately and in the same direction that the presence of metal
atoms in the gas phase affects it. Formation of the caesium monolayer
produces a dramatic effect: the cathode surface temperature decreases
very strongly, the diffuse-mode current–voltage characteristic becomes
N–S-shaped.
Description
Keywords
Current transfer to cathodes Metal halide plasmas . Faculdade de Ciências Exatas e da Engenharia
Citation
Benilov, M. S., Cunha, M. D., & Naidis, G. V. (2005). Modelling current transfer to cathodes in metal halide plasmas. Journal of Physics D: Applied Physics, 38(17), 3155-3162.
Publisher
IOP Publishing