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Tungsten erosion in the all-metal tokamaks JET and ASDEX Upgrade
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2012 (English)In: 39th EPS Conference on Plasma Physics 2012, EPS 2012 and the 16th International Congress on Plasma Physics: Volume 1, 2012, 2012, 253-256 p.Conference paper (Refereed)
Abstract [en]

The tungsten source in the all W outer divertor and Be main wall configuration has been quantified mainly during L-mode plasmas and compared to AUG Data both gained from local spectroscopy. Results so far show differences between AUG and JET based on impurities in the plasma changing the sputter behavior. This stresses the need for detailed analysis of the divertor impurity composition and detailed molding in the future analysis. The H-Mode examples indicate at ELM dominated sputtering and a rather low averaged sputtering yield in general. Nitrogen seeding can change the divertor conditions significantly either increasing W sputtering or suppressing it due to local cooling, JET and AUG behave similarly. All together it is clear that by having low divertor temperature or a beneficial impurity composition sputtering can be controlled and is rather low as expected in an all metal environment.

Place, publisher, year, edition, pages
2012. 253-256 p.
Keyword [en]
ASDEX upgrade, Impurities in, Impurity composition, L-mode plasmas, Local cooling, Local spectroscopy, Sputtering yields, Tungsten erosion, Impurities, Plasma simulation, Tokamak devices, Tungsten, Magnetoplasma
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URN: urn:nbn:se:kth:diva-128964ScopusID: 2-s2.0-84876932547ISBN: 978-162276981-0OAI: diva2:649474
39th EPS Conference on Plasma Physics 2012, EPS 2012 and the 16th International Congress on Plasma Physics; Stockholm; Sweden; 2 July 2012 through 6 July 2012

QC 20130918

Available from: 2013-09-18 Created: 2013-09-17 Last updated: 2014-05-12Bibliographically approved

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Ivanova, Darya
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Fusion Plasma Physics
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