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A separate first wall armor as an independent structure, supported on but thermally isolated from the shielding box, has been developed. In the reference design, low temperature (1000 C) conductively cooled carbon fibre composite tiles are mechanically attached to individual heat sinks. An intermediate layer between tile and heat sink is required in order to ensure effective distribution and reliable maintenance of contact pressure and, thus, of heat transfer throughout the operating cycle. Following a compliant layer development, different grades of exfoliated graphite, undoped and fibre doped PAPYEX were fabricated and results from their thermal and mechanical characterisation are reported. 3D thermohydraulical and 2D thermomechanical analysis of reference tile assemblies with heat sink, which includes Glidcop coolant tubes, showed that no local loss of contact between tile and heat sink is anticipated at an incident heat flux of 0.6 MW/m2 (volumetric heating rate of 7 MW/m3). Pessimistic neutron damaged conductivities in all carbon based materials were assumed. A prototype test section, including 12 armor tiles, was fabricated and heat flux tested in the 200 kW electron beam facility at Framatome. A technical description of the concept and its design limits is included in this paper.

Additional information

Authors: LIPA M, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Paper presented: 17th Symposium on Fusion Technology, Roma (IT), September 14-18, 1992
Availability: Available from (1) as Paper EN 37058 ORA
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