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Development of tungsten coated first wall and high heat flux components for application in ASDEX Upgrade

MPS-Authors

Maier,  H.
Max Planck Society;

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Balden,  M.
Material Research (MF), Max Planck Institute for Plasma Physics, Max Planck Society;

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Lindig,  S.
Material Research (MF), Max Planck Institute for Plasma Physics, Max Planck Society;

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Rohde,  V.
Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society;

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Bolt,  H.
Material Research (MF), Max Planck Institute for Plasma Physics, Max Planck Society;

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Citation

Maier, H., Luthin, J., Balden, M., Lindig, S., Linke, J., Rohde, V., et al. (2002). Development of tungsten coated first wall and high heat flux components for application in ASDEX Upgrade. Journal of Nuclear Materials, 307-311, 116-120.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0027-4220-3
Abstract
In the tokamak experiment ASDEX Upgrade, the investigation of tungsten as a first wall material is an ongoing research project. In a step-by-step strategy, the tungsten covered surface area is increased from campaign to campaign. For this purpose an industrial-scale method for coating graphite with micrometer tungsten films had to be identified. Test coatings deposited by magnetron sputtering and by plasma-arc deposition were compared. By X-ray analysis it was found that sputter- deposited coatings suffer from high compressive stress (1.7 GPa). This leads to delamination when a film thickness of about 3 pm is exceeded. For are-deposited coatings, a compressive stress value of 0.5 GPa was determined and no delamination occurred up to the maximum film thicknesses investigated, i.e. 10 mum. Upon thermal loading, none of the arc-deposited coatings failed up to the melting condition, while one sputter- coating delaminated. First results on similar investigations employing CFC substrates are presented. (C) 2002 Elsevier Science B.V. All rights reserved.