NDLI: He-cooled Divertor for DEMO Status of Design and HHF Tests

Content Provider	IEEE Xplore Digital Library
Author	Norajitra, P. Gervash, A. Giniyatulin, R. Ihli, T. Krauss, W. Kruessmann, R. Kuznetsov, V. Makhankov, A. Mazul, I. Ovchinnikov, I. Reiser, J. Ruprecht, R. Widak, V.
Copyright Year	2007
Description	Author affiliation: Forschungszentrum Karlsruhe, Karlsruhe (Norajitra, P.; Ihli, T.; Krauss, W.; Kruessmann, R.; Reiser, J.; Ruprecht, R.; Widak, V.)
Abstract	A modular He-cooled divertor concept for DEMO has been developed at Forschungszentrum Karlsruhe in cooperation with the Efremov Institute. The work covers the areas of design, analyses, fabrication technology, and experimental design verification. The overall design goal is to reach a heat flux of 10 $MW/m^{2}$ at least. The selected reference design HEMJ (He-cooled modular divertor with multiple-jet cooling) employs small tiles made of tungsten, which are brazed to a finger-like thimble structure, which is made of tungsten alloy. The finger module is cooled by multiple jets of helium (10 MPa, 634degC) directly impinging onto the inner heated surface of the thimble. For the experimental verification of the design, a combined facility at Efremov, comprising a helium loop and an electron beam facility, was used. Technological studies focussed on the fabrication of tungsten divertor mock-ups, combined with an Eurofer steel structure. The first series of 1-finger mock-ups manufactured in this way were successfully HHF-tested in 2006. The test results confirmed the feasibility and the required performance of the design. The 2007 test series use mock-ups which have been improved in terms of thermal stress reduction and increasing manufacturing quality of tungsten parts (tile and thimble) and show a tendency of lifetime enhancement, i.e. surviving larger thermal cycles.
Starting Page	1
Ending Page	4
File Size	4239873
Page Count	4
File Format	PDF
ISBN	9781424411931
DOI	10.1109/FUSION.2007.4337885
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-06-17
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Testing Tungsten Thermal stresses Fabrication Tiles Helium Manufacturing Design for experiments Cooling Fingers HHF tests helium-cooled divertor tungsten manufacture high-temperature brazing
Content Type	Text
Resource Type	Article

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