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Detailed numerical simulation of cathode spots in vacuum arcs—I

2017Journal article Open access
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dc.contributor.authorCunha, Mário D.
dc.contributor.authorKaufmann, Helena T. C.
dc.contributor.authorBenilov, Mikhail S.
dc.contributor.authorHartmann, Werner
dc.contributor.authorWenzel, Norbert
dc.date.accessioned2022-09-05T13:17:44Z
dc.date.available2022-09-05T13:17:44Z
dc.date.issued2017
dc.description.abstractA model of cathode spots in high-current vacuum arcs is developed, with account of the plasma cloud left over from a previously existing spot, all mechanisms of current transfer to the cathode surface, including the contribution of the plasma produced by ionization of the metal vapor emitted in the spot, and the Joule heat generation in the cathode body. The simulation results allow one to clearly identify the different phases of life of an individual spot: the ignition, the expansion over the cathode surface, and the thermal explosion. The expansion phase is associated with a nearly constant maximum temperature of the cathode, which occurs at the surface and is approximately 4700–4800 K. Thermal explosion is a result of thermal instabil ity (runaway), which develops below the cathode surface when the Joule heating comes into play. The development of the spot is interrupted if the plasma cloud has been extinguished: the spot is destroyed by heat removal into the bulk of the cathode due to thermal conduction. Therefore, different scenarios are possible depending on the time of action of the cloud: the spot may be quenched before having been formed or during the expansion phase, or even at the initial stage of thermal explosion.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationCunha, M. D., Kaufmann, H. T., Benilov, M. S., Hartmann, W., & Wenzel, N. (2017). Detailed numerical simulation of cathode spots in vacuum arcs—I. IEEE Transactions on Plasma Science, 45(8), 2060-2069. DOI: 10.1109/TPS.2017.2697005pt_PT
dc.identifier.doi10.1109/TPS.2017.2697005pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.13/4562
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherInstitute of Electrical and Electronics Engineerspt_PT
dc.relationInstitute for Plasmas and Nuclear Fusion
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/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.titleDetailed numerical simulation of cathode spots in vacuum arcs—Ipt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleInstitute for Plasmas and Nuclear Fusion
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FFIS%2F50010%2F2013/PT
oaire.citation.endPage2069pt_PT
oaire.citation.issue8pt_PT
oaire.citation.startPage2060pt_PT
oaire.citation.titleIEEE Transactions on Plasma Sciencept_PT
oaire.citation.volume45pt_PT
oaire.fundingStream6817 - DCRRNI ID
person.familyNameCunha
person.familyNameda Costa Kaufmann
person.familyNameBenilov
person.givenNameMário
person.givenNameHelena Teresa
person.givenNameMikhail
person.identifierF-9313-2019
person.identifier.ciencia-idC81B-A663-3AA1
person.identifier.ciencia-id0F14-A79A-97C1
person.identifier.orcid0000-0002-0397-536X
person.identifier.orcid0000-0001-6740-2467
person.identifier.orcid0000-0001-9059-1948
person.identifier.ridK-4443-2015
person.identifier.scopus-author-id7102711276
person.identifier.scopus-author-id57194384877
person.identifier.scopus-author-id7005138676
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication8509472b-5d78-47db-bfa0-51625a4e9218
relation.isAuthorOfPublicationc925c328-4ea8-4602-895e-a409ad12f24c
relation.isAuthorOfPublication5ccf95a3-53d5-446c-857c-55d64b887175
relation.isAuthorOfPublication.latestForDiscoveryc925c328-4ea8-4602-895e-a409ad12f24c
relation.isProjectOfPublication773f8550-0778-4bd3-b859-600f4fca9629
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