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Simulations with current constraints of ELM-induced tungsten melt motion in ASDEX Upgrade
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.ORCID iD: 0000-0002-6712-3625
KTH, School of Electrical Engineering (EES), Space and Plasma Physics. KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.ORCID iD: 0000-0001-9632-8104
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2017 (English)In: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896, Vol. T170, article id 014006Article in journal (Refereed) Published
Abstract [en]

Melt motion simulations of recent ASDEX Upgrade experiments on transient-induced melting of a tungsten leading edge during ELMing H-mode are performed with the incompressible fluid dynamics code MEMOS 3D. The total current flowing through the sample was measured in these experiments providing an important constraint for the simulations since thermionic emission is considered to be responsible for the replacement current driving melt motion. To allow for a reliable comparison, the description of the space-charge limited regime of thermionic emission has been updated in the code. The effect of non-periodic aspects of the spatio-temporal heat flux in the temperature distribution and melt characteristics as well as the importance of current limitation are investigated. The results are compared with measurements of the total current and melt profile.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2017. Vol. T170, article id 014006
Keywords [en]
transient melting, melt layer motion, thermionic emission, space-charge limitation
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-217724DOI: 10.1088/1402-4896/aa8855ISI: 000414120500006Scopus ID: 2-s2.0-85030833199OAI: oai:DiVA.org:kth-217724DiVA, id: diva2:1160370
Conference
16th International Conference on Plasma-Facing Materials and Components for Fusion Applications, MAY 16-19, 2017, GERMANY
Note

QC 20171127

Available from: 2017-11-27 Created: 2017-11-27 Last updated: 2017-12-01Bibliographically approved

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Ratynskaia, Svetlana V.Tolias, Panagiotis

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