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Stability of very-high pressure arc discharges against perturbations of the electron temperature

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dc.contributor.authorBenilov, M. S.
dc.contributor.authorHechtfischer, U.
dc.date.accessioned2022-09-01T09:15:47Z
dc.date.available2022-09-01T09:15:47Z
dc.date.issued2012
dc.description.abstractWe study the stability of the energy balance of the electron gas in very high–pressure plasmas against longitudinal perturbations, using a local dispersion analysis. After deriving a dispersion equation, we apply the model to a very high–pressure (100 bar) xenon plasma and find instability for electron temperatures, Te, in a window between 2400 K and 5500-7000 K, depending on the current density (106 –108 A/m2 ). The instability can be traced back to the Joule heating of the electron gas being a growing function of Te, which is due to a rising dependence of the electron atom collision frequency on Te. We then analyze the Te range occurring in very high–pressure xenon lamps and conclude that only the near-anode region exhibits Te sufficiently low for this instability to occur. Indeed, previous experiments have revealed that such lamps develop, under certain conditions, voltage oscillations accompanied by electromagnetic interference, and this instability has been pinned down to the plasma-anode interaction. A relation between the mechanisms of the considered instability and multiple anodic attachments of high-pressure arcs is discussed.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationBenilov, M. S., & Hechtfischer, U. (2012). Stability of very-high pressure arc discharges against perturbations of the electron temperature. Journal of Applied Physics, 111(7), 073305. DOI: 10.1063/1.3702469pt_PT
dc.identifier.doi10.1063/1.3702469pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.13/4541
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherAmerican Institute of Physicspt_PT
dc.relationCathode spots in high-pressure DC gas discharges: self-organization phenomena
dc.relationStrategic Project - UI 219 - 2011-2012
dc.relation.publisherversionhttps://aip.scitation.org/doi/full/10.1063/1.3702469pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectVery-high pressure arc dischargespt_PT
dc.subjectElectron temperaturept_PT
dc.subject.pt_PT
dc.subjectFaculdade de Ciências Exatas e da Engenhariapt_PT
dc.titleStability of very-high pressure arc discharges against perturbations of the electron temperaturept_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleCathode spots in high-pressure DC gas discharges: self-organization phenomena
oaire.awardTitleStrategic Project - UI 219 - 2011-2012
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FFIS%2F68609%2F2006/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/PEst-OE%2FMAT%2FUI0219%2F2011/PT
oaire.citation.issue7pt_PT
oaire.citation.startPage073305pt_PT
oaire.citation.titleJournal of Applied Physicspt_PT
oaire.citation.volume111pt_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
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relation.isAuthorOfPublication.latestForDiscovery5ccf95a3-53d5-446c-857c-55d64b887175
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