E × B Flux Driven Detachment Bifurcation in the DIII-D Tokamak

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Järvinen, A.E.
dc.contributor.author Allen, S.L.
dc.contributor.author Eldon, D.
dc.contributor.author Fenstermacher, M.E.
dc.contributor.author Groth, Mathias
dc.contributor.author Hill, David N
dc.contributor.author Leonard, A.W.
dc.contributor.author McLean, A.G.
dc.contributor.author Porter, G.D.
dc.contributor.author Rognlien, T.D.
dc.contributor.author Samuell, C. M.
dc.contributor.author Wang, Huiqian
dc.date.accessioned 2018-10-16T08:56:12Z
dc.date.available 2018-10-16T08:56:12Z
dc.date.issued 2018-08-14
dc.identifier.citation Järvinen , A E , Allen , S L , Eldon , D , Fenstermacher , M E , Groth , M , Hill , D N , Leonard , A W , McLean , A G , Porter , G D , Rognlien , T D , Samuell , C M & Wang , H 2018 , ' E × B Flux Driven Detachment Bifurcation in the DIII-D Tokamak ' PHYSICAL REVIEW LETTERS , vol 121 , no. 7 , 075001 , pp. 1-4 . DOI: 10.1103/PhysRevLett.121.075001 en
dc.identifier.issn 0031-9007
dc.identifier.issn 1079-7114
dc.identifier.other PURE UUID: acff7c50-ebae-432f-ba30-1da940859883
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/e--b-flux-driven-detachment-bifurcation-in-the-diiid-tokamak(acff7c50-ebae-432f-ba30-1da940859883).html
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/28689967/PhysRevLett.121.075001.pdf
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/34311
dc.description.abstract A bifurcative step transition from low-density, high-temperature, attached divertor conditions to high-density, low-temperature, detached divertor conditions is experimentally observed in DIII-D tokamak plasmas as density is increased. The step transition is only observed in the high confinement mode and only when the B × ∇B drift is directed towards the divertor. This work reports for the first time a theoretical explanation and numerical simulations that qualitatively reproduce this bifurcation and its dependence on the toroidal field direction. According to the model, the bifurcation is primarily driven by the interdependence of the E × B-drift fluxes, divertor electric potential structure, and divertor conditions. In the attached conditions, strong potential gradients in the low field side (LFS) divertor drive E × B-drift flux towards the high field side divertor, reinforcing low density, high temperature conditions in the LFS divertor leg. At the onset of detachment, reduction in the potential gradients in the LFS divertor leg reduce the E × B-drift flux as well, such that the divertor plasma evolves nonlinearly to high density, strongly detached conditions. Experimental estimates of the E × B-drift fluxes, based on divertor Thomson scattering measurements, and their dependence on the divertor conditions are qualitatively consistent with the numerical predictions. The implications for divertor power exhaust and detachment control in the next step fusion devices are discussed. en
dc.format.extent 4
dc.format.extent 1-4
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries PHYSICAL REVIEW LETTERS en
dc.relation.ispartofseries Volume 121, issue 7 en
dc.rights openAccess en
dc.subject.other 114 Physical sciences en
dc.subject.other Physics en
dc.title E × B Flux Driven Detachment Bifurcation in the DIII-D Tokamak en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Lawrence Livermore National Laboratory
dc.contributor.department General Atomics
dc.contributor.department Fusion and Plasma Physics
dc.contributor.department Oak Ridge Associated Universities
dc.contributor.department Department of Applied Physics en
dc.subject.keyword tokamak
dc.subject.keyword detachment
dc.subject.keyword plasma drifts
dc.subject.keyword 114 Physical sciences
dc.subject.keyword Physics
dc.identifier.urn URN:NBN:fi:aalto-201810165388
dc.identifier.doi 10.1103/PhysRevLett.121.075001
dc.type.version publishedVersion

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