THERMAL CYCLING TESTS OF RG-TI MO MONOBLOCK DIVERTOR MODULES/

Test results for actively cooled, graphite RG-Ti type brazed to molybd enum tube divertor mock-ups are presented. Particular attention was pa id to finding a reliable, non-destructive method of investigating braz ed joints. The mock-ups were ultrasonically tested and the results cor related with the microstructure of the joints. Two types of tests were carried out: screening tests with a stepped increase of the surface h eat flux from shot to shot and thermal cycling tests at a fixed power density level. The heat loads were varied in the range from 6 MW/m(2) to 12 MW/m(2). About 150 cycles of heat loads with a power density of 10 MW/m(2) were realized and no macrodamage was found. The heat flux e xperiments were accompanied by detailed metallographic investigations.