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Since 1993, a tungsten programme is run at ASDEX Upgrade, leading to the installation of a complete W-divertor in 1995 followed by 1 year of operation. From 1998 onwards, an increasing area of tungsten-coated tiles has been installed at the central column of ASDEX Upgrade, reaching an area of 7.1 square metres in 2001/2002 representing about 85% of the total area of the central column. The programme comprises not only the operation with large area W-coatings but also the qualification and testing of the coated tiles, W-erosion and -migration investigations, development of spectroscopic diagnostics and interpretation of the observed W-behaviour by impurity transport calculations. During the campaigns with the W-divertor as well as with W-coated central column, almost no negative influence on the plasma performance was found. The W-erosion is dominated by light intrinsic impurities and typical tungsten concentrations in the main plasma range from below 10{-6} up to a few times 10{-5}, which would be sufficiently low for a burning plasma.

Additional information

Authors: NEU R ET AL, Max-Planck-Institut fur Plasmaphysik, EURATOM Association, Garching (DE)
Bibliographic Reference: An article published in: Fusion Engineering and Design, Volume 65, Issue 3 , April 2003, pp. 367-374.
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at:
Record Number: 200316523 / Last updated on: 2003-08-01
Original language: en
Available languages: en
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