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Simulating different modes of current transfer to thermionic cathodes in a wide range of conditions
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Orientador(es)
Resumo(s)
Changes in the pattern of steady-state modes of current transfer to thermionic cathodes
induced by variations of the cathode geometry and temperature of the cooling fluid are studied
numerically. For some combinations of control parameters, only one stable mode in a wide
current range exists, which combines features of spot and diffuse modes. This mode, when
attached to an elongated protrusion on the cathode surface, may be identified with the
so-called super spot mode observed in experiments on low-current arcs. There is also
reasonable agreement between the modelling and the experiment on cathodes of high-current
arcs operating in the diffuse mode. The conclusions on existence under certain conditions of
only one stable mode in a wide current range and of a minimum of the dependence of the
temperature of the hottest point of the cathode on the arc current, manifested by this mode,
may have industrial importance and admit a straightforward experimental verification.
Descrição
Palavras-chave
Thermionic cathodes Current transfer . Faculdade de Ciências Exatas e da Engenharia
Contexto Educativo
Citação
Benilov, M. S., Cunha, M. D., & Faria, M. J. (2009). Simulating different modes of current transfer to thermionic cathodes in a wide range of conditions. Journal of Physics D: Applied Physics, 42(14), 145205. DOI: 10.1088/0022-3727/42/14/145205
Editora
IOP Publishing