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Publication
3D modelling of heating of thermionic cathodes by high-pressure arc plasmas
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Advisor(s)
Abstract(s)
Numerical investigation of steady-state interaction of a high-pressure argon
plasma with a cylindrical tungsten cathode is reported. A whole ‘zoo’ of
very diverse modes of current transfer is revealed. Detailed results are given
for the first five (three-dimensional) 3D spot modes, four of them branching
off from the diffuse mode and one from the first axially symmetric spot
mode. Divergences in the general pattern of solutions, which have been
present in preceding works, are resolved. Hypotheses on stability of
steady-state solutions, available in the literature, are analysed. It is found
that these hypotheses provide an explanation of the fact that the transition
between diffuse and spot modes is difficult to reproduce in the experiment
but they do not explain the indication that it is the low-voltage branch of the
first 3D spot mode that seems to occur in the experiment. Thus, the question
of stability of steady-state solutions remains open: an accurate stability
analysis, as well as additional experimental information is required.
Description
Keywords
Heating of thermionic cathodes High-pressure arc plasmas 3D modeling . Faculdade de Ciências Exatas e da Engenharia
Citation
Benilov, M. S., Carpaij, M., & Cunha, M. D. (2006). 3D modelling of heating of thermionic cathodes by high-pressure arc plasmas. Journal of Physics D: Applied Physics, 39(10), 2124-2134.
Publisher
IOP Publishing