OVERVIEW OF THE EU SMALL-SCALE MOCK-UP TESTS FOR ITER HIGH HEAT-FLUX COMPONENTS

This task within the EU R&D for ITER was aimed at the development of b asic manufacturing solutions for the high heat flux plasma facing comp onents such as the divertor targets, the baffles and limiters. More th an 50 representative small-scale mock-ups have been manufactured with beryllium, carbon and tungsten armour using various joining technologi es. High heat flux testing of 20 of these mock-ups showed the carbon m ono-blocks to be the most robust solution, surviving 2000 cycles at ab sorbed heat fluxes of up to 24 MW m(-2). With flat armour tiles rapid joint failures occurred at 5-16 MW m(-2) depending on joining technolo gy and armour material. These test results serve as a basis for the se lection of manufacturing options and materials for the prototypes now being ordered. (C) 1998 Elsevier Science S.A. All rights reserved.