Gross and net erosion balance of plasma-facing materials in full-W tokamaks

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dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorHakola, A.en_US
dc.contributor.authorLikonen, J.en_US
dc.contributor.authorLahtinen, A.en_US
dc.contributor.authorVuoriheimo, T.en_US
dc.contributor.authorGroth, M.en_US
dc.contributor.authorKumpulainen, H.en_US
dc.contributor.authorBalden, M.en_US
dc.contributor.authorKrieger, K.en_US
dc.contributor.authorMayer, M.en_US
dc.contributor.authorSchwarz-Selinger, T.en_US
dc.contributor.authorBrezinsek, S.en_US
dc.contributor.authorKelemen, M.en_US
dc.contributor.authorMarkelj, S.en_US
dc.contributor.authorBarac, M.en_US
dc.contributor.authorGouasmia, S.en_US
dc.contributor.authorRadovic, I. Bogdanovicen_US
dc.contributor.authorUccello, A.en_US
dc.contributor.authorVassallo, E.en_US
dc.contributor.authorDellasega, D.en_US
dc.contributor.authorPassoni, M.en_US
dc.contributor.authorSala, M.en_US
dc.contributor.authorBernard, E.en_US
dc.contributor.authorDiez, M.en_US
dc.contributor.authorGuillemaut, C.en_US
dc.contributor.authorTsitrone, E.en_US
dc.contributor.author, ASDEX Upgrade Teamen_US
dc.contributor.author, EUROfusion MST1 Teamen_US
dc.contributor.author, EUROfusion WP PFC Contributorsen_US
dc.contributor.departmentDepartment of Applied Physicsen
dc.contributor.groupauthorFusion and Plasma Physicsen
dc.contributor.organizationVTT Technical Research Centre of Finlanden_US
dc.contributor.organizationUniversity of Helsinkien_US
dc.contributor.organizationMax Planck Institute for Plasma Physicsen_US
dc.contributor.organizationJülich Research Centreen_US
dc.contributor.organizationJožef Stefan Instituteen_US
dc.contributor.organizationRuder Boskovic Instituteen_US
dc.contributor.organizationConsiglio Nazionale delle Ricerche (CNR)en_US
dc.contributor.organizationPolytechnic University of Milanen_US
dc.contributor.organizationEURATOM/CEAen_US
dc.date.accessioned2021-11-10T07:47:06Z
dc.date.available2021-11-10T07:47:06Z
dc.date.issued2021-11en_US
dc.description| openaire: EC/H2020/633053/EU//EUROfusion
dc.description.abstractGross and net erosion of tungsten (W) and other plasma-facing materials in the divertor region have been investigated in deuterium (D) and helium (He) plasmas during dedicated experiments in L- and H-mode on ASDEX Upgrade and after full-length experimental campaigns on the WEST tokamak. Net erosion was determined via post-exposure analyses of plasma-exposed samples and full-size wall components, and we conclude that the same approach is applicable to gross erosion if marker structures with sub-millimeter dimensions are used to eliminate the contribution of prompt re-deposition. In H-mode plasmas, gross erosion during ELMs may exceed the situation in inter-ELM conditions by 1-2 orders of magnitude while net erosion is typically higher by a factor of 2-3. The largest impact on net erosion is attributed to the electron temperature while the role of the impurity mixtures is weaker, even though both on ASDEX Upgrade and WEST significant amounts of impurities are present in the edge plasmas. Impurities, on the other hand, will lead to the formation of thick co-deposited layers. We have also noted that with increasing surface roughness, net erosion is strongly suppressed and the growth of co-deposited layers is enhanced. In He plasmas, gross erosion is increased compared to D due to the higher mass and charge states of the plasma particles, resulting from larger energies due to sheath acceleration, but strong impurity fluxes can result in apparent net deposition in the divertor. Our results from ASDEX Upgrade and WEST are comparable and indicate typical net-erosion rates of 0.1-0.4 nm s(-1), excluding the immediate vicinity of the strike-point regions.en
dc.description.versionPeer revieweden
dc.format.extent13
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationHakola, A, Likonen, J, Lahtinen, A, Vuoriheimo, T, Groth, M, Kumpulainen, H, Balden, M, Krieger, K, Mayer, M, Schwarz-Selinger, T, Brezinsek, S, Kelemen, M, Markelj, S, Barac, M, Gouasmia, S, Radovic, I B, Uccello, A, Vassallo, E, Dellasega, D, Passoni, M, Sala, M, Bernard, E, Diez, M, Guillemaut, C, Tsitrone, E, ASDEX Upgrade Team, EUROfusion MST1 Team & EUROfusion WP PFC Team 2021, ' Gross and net erosion balance of plasma-facing materials in full-W tokamaks ', Nuclear Fusion, vol. 61, no. 11, 116006 . https://doi.org/10.1088/1741-4326/ac22d2en
dc.identifier.doi10.1088/1741-4326/ac22d2en_US
dc.identifier.issn0029-5515
dc.identifier.issn1741-4326
dc.identifier.otherPURE UUID: 544b21cf-8098-4d57-a295-f1435a18eef1en_US
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/544b21cf-8098-4d57-a295-f1435a18eef1en_US
dc.identifier.otherPURE LINK: http://www.scopus.com/inward/record.url?scp=85118552367&partnerID=8YFLogxKen_US
dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/74630625/Hakola_Gross_and_net_erosion_balance_of_plasma_facing_materials_in_full_W_tokamaks.pdfen_US
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/110889
dc.identifier.urnURN:NBN:fi:aalto-2021111010060
dc.language.isoenen
dc.publisherIOP Publishing Ltd.
dc.relationinfo:eu-repo/grantAgreement/EC/H2020/633053/EU//EUROfusionen_US
dc.relation.ispartofseriesNuclear Fusionen
dc.relation.ispartofseriesVolume 61, issue 11en
dc.rightsopenAccessen
dc.subject.keyworderosionen_US
dc.subject.keywordtungstenen_US
dc.subject.keywordplasma-facing materialen_US
dc.subject.keywordASDEX Upgradeen_US
dc.subject.keywordWESTen_US
dc.subject.keywordTUNGSTENen_US
dc.subject.keywordDIVERTORen_US
dc.subject.keywordCARBONen_US
dc.subject.keywordEROen_US
dc.titleGross and net erosion balance of plasma-facing materials in full-W tokamaksen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.versionpublishedVersion
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