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An analytical expression for ion velocities at the wall including the sheath electric field and surface biasing for erosion modeling at JET ILW
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
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Number of Authors: 11212017 (English)In: Nuclear Materials and Energy, E-ISSN 2352-1791, Vol. 12, p. 341-345Article in journal (Refereed) Published
Abstract [en]

For simulation of plasma-facing component erosion in fusion experiments, an analytical expression for the ion velocity just before the surface impact including the local electric field and an optional surface biasing effect is suggested. Energy and angular impact distributions and the resulting effective sputtering yields were produced for several experimental scenarios at JET ILW mostly involving PFCs exposed to an oblique magnetic field. The analytic solution has been applied as an improvement to earlier ERO modelling of localized, Be outer limiter, RF-enhanced erosion, modulated by toggling of a remote, however magnetically connected ICRH antenna. The effective W sputtering yields due to D and Be ion impact in Type-I and Type-III ELMs and inter-ELM conditions were also estimated using the analytical approach and benchmarked by spectroscopy. The intra-ELM W sputtering flux increases almost 10 times in comparison to the inter-ELM flux. (C) 2017 Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license.

Place, publisher, year, edition, pages
ELSEVIER , 2017. Vol. 12, p. 341-345
Keywords [en]
Plasma-surface interaction, JET, ITER-like wall, Beryllium, Erosion, Oblique magnetic field, Electric field, ELM
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-398911DOI: 10.1016/j.nme.2017.03.031ISI: 000417293300051OAI: oai:DiVA.org:uu-398911DiVA, id: diva2:1379790
Note

For complete list of authors see http://dx.doi.org/10.1016/j.nme.2017.03.031

Available from: 2019-12-17 Created: 2019-12-17 Last updated: 2019-12-17Bibliographically approved

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