Analysis of the Wendelstein 7-X Inertially Cooled Test Divertor Unit Scraper Element
Authors: Peter H. Titus, H. Zhang, A. Lumsdaine ,W.D. McGinnis, J. Lore, H. Neilson, T. Brown, J. Boscary, A. Peacock, and Joris Fellinger
Abstract:Early implementation of divertor components for the Wendelstein 7-X stellarator will include an inertially cooled system of divertor elements called the Test Divertor Unit (TDU). One part of this system is a scraper element that is intended to explore methods of mitigating heat flux on the ends of the TDU elements. This system will be in place in 2017, after a run period that will involve no divertor, and will precede steady state operation with actively cooled divertors scheduled for 2019. The TDU scraper element is an experimental device with uncertain requirements and with loading conditions which will developed as a part of the experiment. The pattern of heat flux may vary from currently predicted distributions and intensities. The design of the scraper element must accommodate this uncertainty. Originally the mechanical design was to be based on extensive studies for the monoblock-based design of an actively cooled system. An obvious simplification is the elimination of the manifolding needed for the water cooling.
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Presented at: Symposium on Fusion Technology (SOFT), San Sebastian Spain, October 2, 2014
Submitted to: Fusion Engineering and Design
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