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dc.creatorLawson, K.D.es
dc.creatorAggarwal, K.M.es
dc.creatorCoffey, I.H.es
dc.creatorKeenan, F.P.es
dc.creatorO'Mullane, M.G.es
dc.creatorJet Contributorses
dc.creatorGarcía Muñoz, Manueles
dc.date.accessioned2020-07-08T14:23:20Z
dc.date.available2020-07-08T14:23:20Z
dc.date.issued2019-02-28
dc.identifier.citationLawson, K.D., Aggarwal, K.M., Coffey, I.H., Keenan, F.P., O'Mullane, M.G., Jet Contributors, y García Muñoz, M. (2019). Population modelling of the He II energy levels in tokamak plasmas: I. Collisional excitation model. Journal of Physics B-Atomic Molecular and Optical Physics, 52 (4), 1-45.
dc.identifier.issn1361-6455es
dc.identifier.urihttps://hdl.handle.net/11441/99059
dc.description.abstractHelium is widely used as a fuel or minority gas in laboratory fusion experiments, and will be present as ash in DT thermonuclear plasmas. It is therefore essential to have a good understanding of its atomic physics. To this end He II population modelling has been undertaken for the spectroscopic levels arising from shells with principal quantum number n = 1 to 5. This paper focuses on a collisional excitation model; ionization and recombination will be considered in a subsequent article. Heavy particle collisional excitation rate coefficients have been generated to supplement the currently-available atomic data for He II, and are presented for proton, deuteron, triton and α-particle projectiles. The widely-used criterion for levels within an n shell being populated in proportion to their statistical weights is reassessed with the most recent atomic data, and found not to apply to the He II levels at tokamak densities (1018–1021 m-3). Consequences of this and other likely sources of errors are quantified, as is the effect of differing electron and ion temperatures. Line intensity ratios, including the so-called ‘branching ratios’ and the fine-structure β1, β2, β3 and γ ratios, are discussed, the latter with regard to their possible use as diagnostics.es
dc.description.sponsorshipEURATOM 633053es
dc.description.sponsorshipResearch Councils UK EP/P012450/1es
dc.formatapplication/pdfes
dc.format.extent45 p.es
dc.language.isoenges
dc.publisherIOP Publishinges
dc.relation.ispartofJournal of Physics B-Atomic Molecular and Optical Physics, 52 (4), 1-45.
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internacional*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.titlePopulation modelling of the He II energy levels in tokamak plasmas: I. Collisional excitation modeles
dc.typeinfo:eu-repo/semantics/articlees
dcterms.identifierhttps://ror.org/03yxnpp24
dc.type.versioninfo:eu-repo/semantics/submittedVersiones
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses
dc.contributor.affiliationUniversidad de Sevilla. Departamento de Física Atómica, Molecular y Nucleares
dc.relation.projectID633053es
dc.relation.projectIDEP/P012450/1es
dc.relation.publisherversionhttp://dx.doi.org/10.1088/1361-6455/aaf703es
dc.identifier.doi10.1088/1361-6455/aaf703es
dc.contributor.groupUniversidad de Sevilla. RNM138: Física Nuclear Aplicadaes
dc.journaltitleJournal of Physics B-Atomic Molecular and Optical Physicses
dc.publication.volumen52es
dc.publication.issue4es
dc.publication.initialPage1es
dc.publication.endPage45es

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