Journal
PHYSICA SCRIPTA
Volume T159, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0031-8949/2014/T159/014037
Keywords
nuclear fusion; plasma-wall interaction; power exhaust; fusion materials; liquid metals; tin; lithium
Categories
Funding
- European Communities
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Applying liquid metals as plasma facing components for fusion power-exhaust can potentially ameliorate lifetime issues as well as limitations to the maximum allowed surface heat loads by allowing for a more direct contact with the coolant. The material choice has so far been focused on lithium (Li), as it showed beneficial impact on plasma operation. Here materials such as tin (Sn), gallium (Ga) and aluminum (Al) are discussed as alternatives potentially allowing higher operating temperatures without strong evaporation. Power loads of up to 25 MW m(-2) for a Sn/W component can be envisioned based on calculations and modeling. Reaching a higher operating temperature due to material re-deposition will be discussed. Liquids typically face stability issues due to j x B forces, potential pressure and magnetohydrodynamic driven instabilities. The capillary porous system is used for stabilization by a mesh (W and Mo) substrate and replenishment by means of capillary action.
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