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Formation of stationary and transient spots on thermionic cathodes and its prevention

2008Journal article Open access
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dc.contributor.authorAlmeida, Pedro G. C.
dc.contributor.authorBenilov, M. S.
dc.contributor.authorCunha, M. D.
dc.date.accessioned2022-08-30T14:47:01Z
dc.date.available2022-08-30T14:47:01Z
dc.date.issued2008
dc.description.abstractSpots on cathodes of high-pressure arc discharges induced by a rapid increase in the arc current are studied numerically and experimentally. Appearance of stationary and transient spots is analysed in the context of the general pattern of steady-state modes of current transfer to thermionic cathodes and their stability. Transient spots are studied in experiments with COST-529 standard lamps. Modelling and experimental results are in reasonable agreement. A method to prevent formation of transient spots on cathodes of high-pressure arc discharges by means of short negative rectangular current pulses is proposed and validated both numerically and experimentally. Experimental indications are found that the main mechanism of blackening of burners of HID lamps that accompanies appearance of transient cathode spots is evaporation of the cathode material and not sputtering.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationAlmeida, P. G. C., Benilov, M. S., & Cunha, M. D. (2008). Formation of stationary and transient spots on thermionic cathodes and its prevention. Journal of Physics D: Applied Physics, 41(14), 144004. DOI: 10.1088/0022-3727/41/14/144004pt_PT
dc.identifier.doi10.1088/0022-3727/41/14/144004pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.13/4527
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherIOP Publishingpt_PT
dc.relationModes of current transfer to cathodes of high-pressure arc discharges and their stability
dc.relationESTUDO DOS MODOS DE TRANSFERÊNCIA DE CORRENTE AOS CÁTODOS DAS DESCARGAS DE GÁS
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectArc dischargespt_PT
dc.subjectStationary and transient spotspt_PT
dc.subjectThermionic cathodespt_PT
dc.subject.pt_PT
dc.subjectFaculdade de Ciências Exatas e da Engenhariapt_PT
dc.titleFormation of stationary and transient spots on thermionic cathodes and its preventionpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleModes of current transfer to cathodes of high-pressure arc discharges and their stability
oaire.awardTitleESTUDO DOS MODOS DE TRANSFERÊNCIA DE CORRENTE AOS CÁTODOS DAS DESCARGAS DE GÁS
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/POCI/POCI%2FFIS%2F60526%2F2004/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/POSI/SFRH%2FBD%2F30598%2F2006/PT
oaire.citation.issue14pt_PT
oaire.citation.startPage144004pt_PT
oaire.citation.titleJournal of Physics D: Applied Physicspt_PT
oaire.citation.volume41pt_PT
oaire.fundingStreamPOCI
oaire.fundingStreamPOSI
person.familyNameAlmeida
person.familyNameBenilov
person.familyNameCunha
person.givenNamePedro G C
person.givenNameMikhail
person.givenNameMário
person.identifier.ciencia-idD61F-B90C-70B2
person.identifier.ciencia-id0F14-A79A-97C1
person.identifier.orcid0000-0002-8395-2693
person.identifier.orcid0000-0001-9059-1948
person.identifier.orcid0000-0002-0397-536X
person.identifier.ridK-4443-2015
person.identifier.scopus-author-id8157100900
person.identifier.scopus-author-id7005138676
person.identifier.scopus-author-id7102711276
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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