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Physics of spotless mode of current transfer to cathodes of metal vapor arcs

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dc.contributor.authorBenilov, Mikhail S.
dc.contributor.authorBenilova, Larissa G.
dc.date.accessioned2022-09-02T13:55:14Z
dc.date.available2022-09-02T13:55:14Z
dc.date.issued2015
dc.description.abstractA fresh attempt is made to clarify the physics of the diffuse, or spotless, mode of current transfer that may occur on cathodes of vacuum arcs if the average cathode surface temper ature is high enough, about 2000 K. It is shown that in the case of chromium cathode the usual mechanism of current transfer to arc cathodes cannot sustain current densities of the order of 105–106 A · m−2 observed in the experiment, the reason being that the electrical power deposited into electron gas in the near cathode space-charge sheath is insufficient. It is hypothesized that the electrical power is supplied to the electron gas primarily in the bulk plasma, rather than in the sheath, and a high level of electron energy in the vicinity of the sheath edge is sustained by electron heat conduction from the bulk plasma. Estimates of the current of ions diffusing to the sheath edge from the quasi neutral plasma gave values comparable with the experimental current density, which supports the above hypothesis. On the contrary, the spotless attachment of vacuum arcs to gadolinium cathodes may be interpreted as a manifestation of the usual mechanism of current transfer to arc cathodes. Results given for gadolinium cathodes by a model of near-cathode layers in vacuum arcs conform to available experimental information.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationBenilov, M. S., & Benilova, L. G. (2015). Physics of spotless mode of current transfer to cathodes of metal vapor arcs. IEEE Transactions on Plasma Science, 43(8), 2247-2252.pt_PT
dc.identifier.doi10.1109/TPS.2015.2445093pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.13/4555
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherInstitute of Electrical and Electronics Engineerspt_PT
dc.relationModelling, understanding, and controlling self-organization phenomena in plasma-electrode interaction in gas discharges: from first principles to applications
dc.relationInstitute for Plasmas and Nuclear Fusion
dc.relation.publisherversionhttps://ieeexplore.ieee.org/abstract/document/7161379pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectArc dischargespt_PT
dc.subjectElectrodespt_PT
dc.subjectVacuum arcspt_PT
dc.subject.pt_PT
dc.subjectFaculdade de Ciências Exatas e da Engenhariapt_PT
dc.titlePhysics of spotless mode of current transfer to cathodes of metal vapor arcspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleModelling, understanding, and controlling self-organization phenomena in plasma-electrode interaction in gas discharges: from first principles to applications
oaire.awardTitleInstitute for Plasmas and Nuclear Fusion
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FFIS-PLA%2F2708%2F2012/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FFIS%2F50010%2F2013/PT
oaire.citation.endPage2252pt_PT
oaire.citation.issue8pt_PT
oaire.citation.startPage2247pt_PT
oaire.citation.titleIEEE Transactions on Plasma Sciencept_PT
oaire.citation.volume43pt_PT
oaire.fundingStream3599-PPCDT
oaire.fundingStream6817 - DCRRNI ID
person.familyNameBenilov
person.givenNameMikhail
person.identifier.ciencia-id0F14-A79A-97C1
person.identifier.orcid0000-0001-9059-1948
person.identifier.ridK-4443-2015
person.identifier.scopus-author-id7005138676
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
relation.isAuthorOfPublication5ccf95a3-53d5-446c-857c-55d64b887175
relation.isAuthorOfPublication.latestForDiscovery5ccf95a3-53d5-446c-857c-55d64b887175
relation.isProjectOfPublicationac2557f2-e637-477a-8a14-7b1f23978256
relation.isProjectOfPublication773f8550-0778-4bd3-b859-600f4fca9629
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