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The new concept of a long SEP.N112 CFC macroblock structure lined with a brazed thin copper cooling tube has been developed as a divertor target for ITER. The CFC structure can be machined and attached directly on the divertor supporting frame. Carbon composite having 3D isotropic structural resistance and homogeneous good thermal properties allows such an integrated system to be built, avoiding the critical issues due to the use of small size monoblock or flat tiles brazed to a copper or molybdenum tube. The composite structure plays the role of a mechanical structure supporting the thin cooling tube and of an efficient heat sink simultaneously. It avoids the use of a strong D.S copper or molybdenum tube having large deformation and stresses under thermal flux and disruption events. The large size of the macroblock target (from 20 to 80 cm long) permits the spreading of the heat around the power deposition peak by diffusion in the volume of the heat sink which decreases the thermal flux on the cooling tube. The thin liner working at a low temperature is only used for the tightness of the CFC macroblock with regard to the coolant. A 20 cm long CFC macroblock was tested with the 200 kW electron beam developed in Le Creusot. This paper outlines the concepts involved in the manufacture and development of the structure and presents the results of the tests performed.

Additional information

Authors: DESCHAMPS P ET AL., Framatome, Le Creusot (FR);FILIPUZZI L, SEP, Bordeaux (FR)
Bibliographic Reference: Paper presented: 17th Symposium on Fusion Technology, Roma (IT), September 14-18, 1992
Availability: Available from (1) as Paper EN 37060 ORA
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