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| Home > Publications database > Synergistic effects of particle and transient heat loads on ITER-grade tungsten |
| Journal Article | FZJ-2021-01493 |
; ; ;
2020
The Royal Swedish Academy of Sciences
Stockholm
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Please use a persistent id in citations: doi:10.1088/1402-4896/ab3bd9
Abstract: ITER's divertor will have to sustain high particle and heat loads. Tungsten has been chosen as plasma facing material for the entirety of ITER's divertor. Therefore, it is important to study the behavior of ITER-grade tungsten under fusion relevant loads. In this work, tungsten samples with two different microstructures were studied, one with needle-like grains transversal to the surface, and the other with larger, isotropic grains obtained after recrystallization. The samples were exposed to a steady state plasma and a pulsed laser in the linear plasma device PSI-2 to simulate the conditions of the divertor in a fusion reactor. The results show that the transversal samples have a higher damage threshold, but at higher power density and pulse numbers, the damage observed, as well as the surface roughness, is similar. The recrystallized samples displayed a shallower crater depth, which might be an important factor to be considered when selecting a material for ITER and should be studied further.
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