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For the future upgrade of inner vessel components (CIEL project) a guard limiter for plasma ramp-up and disruption protection will be installed on the high field side of the vacuum vessel. Among transient heat loads, this structure has to sustain a moderate heat flux in the range of less than or equal to 0.5 MW/m{2} during quasi steady state operation (1000 s). A bolted carbon-carbon (C-C) tile is preferred compared with a brazed tile solution due to the expected moderate heat fluxes, costs and the possibility of rapid replacement of individual tiles. Large flat tile assemblies require a sufficient soft and conductive compliant layer enclosed between tile and heat sink in order to avoid thermal contact loss of the assembly during heat loads and therefore minimizing the tile surface temperature. The global heat transfer coefficient under vacuum at low contact pressures between C-C and CuCrZr heat sink substrata has been measured in the experimental device, installation of contact heat transfer measurements, using different compliant materials. It appears that the best compliant layer is a graphite sheet (PAPYEX), compared with copper-felt/foam material.

Additional information

Authors: LIPA M, CEA, Cadarache, Saint-Paul-lez-Durance (FR);CHAPPUIS PH, CEA, Cadarache, Saint-Paul-lez-Durance (FR);DUFAYET A, CEA, Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: An article published in: Fusion Engineering and Design, Vol.49-50 (2001), pp.243-248
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