Development of high thermal flux components for continuous operation in tokamaks

High-heat-flux candidate structures of square-shaped dispersion-strengthened copper tubes with heat-transfer-enhanced swirl tape inserted into the cooling channel have been successfully tested in the CEA-FRAMATOME EB (electron beam) facility and in the NB (neutral beam) test bed at JET (Joint European Torus). An incident power deposition up to 33 MW/m² has been removed without damage. CFC (carbon-fiber composite) materials manufactured by Carbone Lorraine and SEP have been brazed to OFHC copper substrates. Despite the stress singularity at the braze joint, the concept appears promising based on these first results. CFC flat tiles brazed on these same cooling structures have withstood incident heat fluxes up to 15 MW/m². The installation of high-heat-flux structures, in the Tore Supra tokamak will complement these studies in a plasma environment