Estimation of 2D distributions of electron density and temperature in the JET divertor from tomographic reconstructions of deuterium Balmer line emission

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dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorKarhunen, J.
dc.contributor.authorLomanowski, B.
dc.contributor.authorSolokha, V.
dc.contributor.authorAleiferis, S.
dc.contributor.authorCarvalho, P.
dc.contributor.authorGroth, M.
dc.contributor.authorKumpulainen, H.
dc.contributor.authorLawson, K. D.
dc.contributor.authorMeigs, A. G.
dc.contributor.authorShaw, A.
dc.contributor.author, JET Contributors
dc.contributor.departmentDepartment of Applied Physics
dc.contributor.departmentOak Ridge National Laboratory
dc.contributor.departmentDemokritos National Centre for Scientific Research
dc.contributor.departmentUniversidade Lisboa
dc.contributor.departmentFusion and Plasma Physics
dc.contributor.departmentCulham Science Centre
dc.date.accessioned2020-12-31T08:50:08Z
dc.date.available2020-12-31T08:50:08Z
dc.date.issued2020-12
dc.description| openaire: EC/H2020/633053/EU//EUROfusion
dc.description.abstractEstimates for 2D distributions of electron density, ne, and temperature, Te, have been obtained using reflection-corrected tomographic reconstructions of deuterium Balmer line emission in the JET divertor. The solutions are obtained by a two-dimensional Monte Carlo optimization model, based on intensity ratios of the Balmer Dα, Dγ and Dε emission and the ADAS photon emission coefficients with additional constraints provided by line-integrated spectroscopic measurements of ne and Te. Synthetic benchmarks utilizing EDGE2D-EIRENE simulation outputs yield reproduction of reference ne and Te distributions within 25% with statistical error estimates of 5–15%. Experimental analysis of an L-mode ne ramp shows extension and movement of the outer divertor high-ne region with ne,div up to 1.5 × 1020 m−3 from the outer strike point to above the X-point and decrease of the divertor Te to the range of 0.5–1.0 eV within 25% agreement with the line-integrated measurements. Comparison between the local estimates and their corresponding line integrals suggests underestimation of ne and Te by up to 75% and 50%, respectively, due to the geometric effects of line integration.en
dc.description.versionPeer revieweden
dc.format.mimetypeapplication/pdf
dc.identifier.citationKarhunen , J , Lomanowski , B , Solokha , V , Aleiferis , S , Carvalho , P , Groth , M , Kumpulainen , H , Lawson , K D , Meigs , A G , Shaw , A & JET Contributors 2020 , ' Estimation of 2D distributions of electron density and temperature in the JET divertor from tomographic reconstructions of deuterium Balmer line emission ' , Nuclear Materials and Energy , vol. 25 , 100831 . https://doi.org/10.1016/j.nme.2020.100831en
dc.identifier.doi10.1016/j.nme.2020.100831
dc.identifier.issn2352-1791
dc.identifier.otherPURE UUID: eca3e534-6a88-4c7f-a0f3-12782b03d57d
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/eca3e534-6a88-4c7f-a0f3-12782b03d57d
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dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/54427601/Karhunen_Estimation.1_s2.0_S2352179120301022_main_2.pdf
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/101659
dc.identifier.urnURN:NBN:fi:aalto-2020123160480
dc.language.isoenen
dc.publisherElsevier Science Publishers BV
dc.relationinfo:eu-repo/grantAgreement/EC/H2020/633053/EU//EUROfusion
dc.relation.ispartofseriesNuclear Materials and Energyen
dc.relation.ispartofseriesVolume 25en
dc.rightsopenAccessen
dc.subject.keywordCamera tomography
dc.subject.keywordDetachment
dc.subject.keywordDivertor physics
dc.subject.keywordDivertor spectroscopy
dc.subject.keywordFusion
dc.titleEstimation of 2D distributions of electron density and temperature in the JET divertor from tomographic reconstructions of deuterium Balmer line emissionen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.versionpublishedVersion
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