Measurement of N+ flows in the high-field side scrape-off layer of ASDEX Upgrade with different degrees of inner divertor detachment

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Karhunen, Juuso
dc.contributor.author Groth, Mathias
dc.contributor.author Heliste, Petteri
dc.contributor.author Pütterich, Thomas
dc.contributor.author Viezzer, Eleonora
dc.contributor.author Carralero, Daniel
dc.contributor.author Coster, David
dc.contributor.author Guimarais, Luis
dc.contributor.author Nikolaeva, Valentina
dc.contributor.author Hakola, Antti
dc.contributor.author Potzel, Steffen
dc.contributor.author ASDEX Upgrade, team
dc.date.accessioned 2018-03-16T10:32:33Z
dc.date.available 2018-03-16T10:32:33Z
dc.date.issued 2017
dc.identifier.citation Karhunen , J , Groth , M , Heliste , P , Pütterich , T , Viezzer , E , Carralero , D , Coster , D , Guimarais , L , Nikolaeva , V , Hakola , A , Potzel , S & ASDEX Upgrade , T 2017 , ' Measurement of N+ flows in the high-field side scrape-off layer of ASDEX Upgrade with different degrees of inner divertor detachment ' Nuclear Materials and Energy , vol 12 , pp. 935-941 . DOI: 10.1016/j.nme.2017.02.020 en
dc.identifier.issn 2352-1791
dc.identifier.other PURE UUID: 6ae31f68-e1ea-401b-b865-cb6850a1eb60
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/measurement-of-n-flows-in-the-highfield-side-scrapeoff-layer-of-asdex-upgrade-with-different-degrees-of-inner-divertor-detachment(6ae31f68-e1ea-401b-b865-cb6850a1eb60).html
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/18018009/1_s2.0_S2352179116301193_main.pdf
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/30274
dc.description.abstract Toroidal and poloidal flows of injected N+ ions were measured in the high-field side (HFS) scrape-off layer (SOL) of ASDEX Upgrade by Doppler spectroscopy with different degrees of HFS divertor detachment. In high-recycling conditions, the results suggest reversed parallel N+ flow away from the inner divertor in the near SOL close to the separatrix, while the flow is towards the inner divertor throughout the SOL in detached conditions. The measured poloidal N+ flows were directed away from the HFS divertor in the near SOL for all density cases. Divertor plasma oscillations, characterized by momentary peaking of the HFS target ion flux and decrease of the HFS SOL density, were observed slightly before the roll-over of the ion saturation current to the HFS target and lead to an increase in the N+ flow towards the HFS divertor. SOLPS and ERO simulations of the experiment predict entrainment below 50% between the velocities of N+ and D+ ions, suggesting that N+ ions are quantitatively a limited proxy for measuring D+ flows. ERO simulations show significantly higher entrainment for higher ionization states, e.g., N2+ and N3+. en
dc.format.extent 935-941
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries Nuclear Materials and Energy en
dc.relation.ispartofseries Volume 12 en
dc.rights openAccess en
dc.subject.other 114 Physical sciences en
dc.title Measurement of N+ flows in the high-field side scrape-off layer of ASDEX Upgrade with different degrees of inner divertor detachment en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Department of Applied Physics
dc.contributor.department Max-Planck-Institut für Plasmaphysik
dc.contributor.department Inst Super Tecn, Instituto Superior Tecnico, Universidade de Lisboa, Assoc Euratom IST, Inst Plasmas & Fusao Nucl
dc.subject.keyword Impurity migration
dc.subject.keyword Doppler spectroscopy
dc.subject.keyword SOL flow
dc.subject.keyword Divertor detachment
dc.subject.keyword 114 Physical sciences
dc.identifier.urn URN:NBN:fi:aalto-201803161744
dc.identifier.doi 10.1016/j.nme.2017.02.020
dc.type.version publishedVersion


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