Comparative H-mode density limit studies in JET and AUG

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Huber, A. Bernert, M. Brezinsek, S. Chankin, A. V. Sergienko, G. Huber, V. Wiesen, S. Abreu, P. Beurskens, M. N.A. Boboc, A. Brix, M. Calabrò, G. Carralero, D. Delabie, E. Eich, T. Esser, H. G. Groth, M. Guillemaut, C. Jachmich, S. Järvinen, A. Joffrin, E. Kallenbach, A. Kruezi, U. Lang, P. Linsmeier, Ch Lowry, C. G. Maggi, C. F. Matthews, G. F. Meigs, A. G. Mertens, Ph Reimold, F. Schweinzer, J. Sips, G. Stamp, M. Viezzer, E. Wischmeier, M. Zohm, H. , JET contributors 2018-02-09T09:52:54Z 2018-02-09T09:52:54Z 2017-08-01
dc.identifier.citation Huber , A , Bernert , M , Brezinsek , S , Chankin , A V , Sergienko , G , Huber , V , Wiesen , S , Abreu , P , Beurskens , M N A , Boboc , A , Brix , M , Calabrò , G , Carralero , D , Delabie , E , Eich , T , Esser , H G , Groth , M , Guillemaut , C , Jachmich , S , Järvinen , A , Joffrin , E , Kallenbach , A , Kruezi , U , Lang , P , Linsmeier , C , Lowry , C G , Maggi , C F , Matthews , G F , Meigs , A G , Mertens , P , Reimold , F , Schweinzer , J , Sips , G , Stamp , M , Viezzer , E , Wischmeier , M , Zohm , H & JET contributors 2017 , ' Comparative H-mode density limit studies in JET and AUG ' Nuclear Materials and Energy , vol 12 , pp. 100-110 . DOI: 10.1016/j.nme.2017.01.005 en
dc.identifier.issn 2352-1791
dc.identifier.other PURE UUID: 09904577-c50f-4614-8355-65c3e6de7c89
dc.identifier.other PURE ITEMURL:
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dc.description.abstract Identification of the mechanisms for the H-mode density limit in machines with fully metallic walls, and their scaling to future devices is essential to find for these machines the optimal operational boundaries with the highest attainable density and confinement. Systematic investigations of H-mode density limit plasmas in experiments with deuterium external gas fuelling have been performed on machines with fully metallic walls, JET and AUG and results have been compared with one another. Basically, the operation phases are identical for both tokamaks: the stable H-mode phase, degrading H-mode phase, breakdown of the H-mode with energy confinement deterioration usually accompanied by a dithering cycling phase, followed by the L-mode phase. The observed H-mode density limit on both machines is found close to the Greenwald limit (n/nGW = 0.8–1.1 in the observed magnetic configurations). The similar behavior of the radiation on both tokamaks demonstrates that the density limit (DL) is neither related to additional energy losses from the confined region by radiation, nor to an inward collapse of the hot discharge core induced by overcooling of the plasma periphery by radiation. It was observed on both machines that detachment, as well as the X-point MARFE itself, does not trigger a transition in the confinement regime and thus does not present a limit on the plasma density. It is the plasma confinement, most likely determined by edge parameters, which is ultimately responsible for the transition from H- to L-mode. The measured Greenwald fractions are found to be consistent with the predictions from different theoretical models [16,30] based on MHD instability theory in the near-SOL. en
dc.format.extent 11
dc.format.extent 100-110
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 Nuclear and High Energy Physics en
dc.subject.other Materials Science (miscellaneous) en
dc.subject.other Nuclear Energy and Engineering en
dc.subject.other 114 Physical sciences en
dc.title Comparative H-mode density limit studies in JET and AUG en
dc.type A2 Katsausartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Culham Science Centre
dc.contributor.department Max Planck Institute for Plasma Physics
dc.contributor.department Jülich Research Centre
dc.contributor.department Instituto Superior Tecnico Lisboa
dc.contributor.department Agenzia nazionale per le nuove tecnologie, l'energia e lo sviluppo economico sostenibile
dc.contributor.department Oak Ridge National Laboratory
dc.contributor.department Department of Applied Physics
dc.contributor.department Royal Military Academy
dc.contributor.department CEA
dc.subject.keyword ASDEX Upgrade
dc.subject.keyword Density limit
dc.subject.keyword Detachment
dc.subject.keyword Greenwald fraction
dc.subject.keyword H-mode
dc.subject.keyword JET
dc.subject.keyword Nuclear and High Energy Physics
dc.subject.keyword Materials Science (miscellaneous)
dc.subject.keyword Nuclear Energy and Engineering
dc.subject.keyword 114 Physical sciences
dc.identifier.urn URN:NBN:fi:aalto-201802091222
dc.identifier.doi 10.1016/j.nme.2017.01.005
dc.type.version publishedVersion

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