Simulating different modes of current transfer to thermionic cathodes in a wide range of conditions

Detalhes bibliográficos
Autor(a) principal: Benilov, M. S.
Data de Publicação: 2009
Outros Autores: Cunha, M. D., Faria, M. J.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.13/4531
Resumo: 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.
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spelling Simulating different modes of current transfer to thermionic cathodes in a wide range of conditionsThermionic cathodesCurrent transfer.Faculdade de Ciências Exatas e da EngenhariaChanges 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.IOP PublishingDigitUMaBenilov, M. S.Cunha, M. D.Faria, M. J.2022-08-31T09:36:53Z2009-01-01T00:00:00Z2009-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.13/4531engBenilov, 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: 10.1088/0022-3727/42/14/14520510.1088/0022-3727/42/14/145205info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2022-09-05T12:57:52Zoai:digituma.uma.pt:10400.13/4531Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T15:08:39.607299Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Simulating different modes of current transfer to thermionic cathodes in a wide range of conditions
title Simulating different modes of current transfer to thermionic cathodes in a wide range of conditions
spellingShingle Simulating different modes of current transfer to thermionic cathodes in a wide range of conditions
Benilov, M. S.
Thermionic cathodes
Current transfer
.
Faculdade de Ciências Exatas e da Engenharia
title_short Simulating different modes of current transfer to thermionic cathodes in a wide range of conditions
title_full Simulating different modes of current transfer to thermionic cathodes in a wide range of conditions
title_fullStr Simulating different modes of current transfer to thermionic cathodes in a wide range of conditions
title_full_unstemmed Simulating different modes of current transfer to thermionic cathodes in a wide range of conditions
title_sort Simulating different modes of current transfer to thermionic cathodes in a wide range of conditions
author Benilov, M. S.
author_facet Benilov, M. S.
Cunha, M. D.
Faria, M. J.
author_role author
author2 Cunha, M. D.
Faria, M. J.
author2_role author
author
dc.contributor.none.fl_str_mv DigitUMa
dc.contributor.author.fl_str_mv Benilov, M. S.
Cunha, M. D.
Faria, M. J.
dc.subject.por.fl_str_mv Thermionic cathodes
Current transfer
.
Faculdade de Ciências Exatas e da Engenharia
topic Thermionic cathodes
Current transfer
.
Faculdade de Ciências Exatas e da Engenharia
description 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.
publishDate 2009
dc.date.none.fl_str_mv 2009-01-01T00:00:00Z
2009-01-01T00:00:00Z
2022-08-31T09:36:53Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.13/4531
url http://hdl.handle.net/10400.13/4531
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 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
10.1088/0022-3727/42/14/145205
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv IOP Publishing
publisher.none.fl_str_mv IOP Publishing
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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