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024 7 _ |a 1402-4896
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100 1 _ |a Gago, M.
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245 _ _ |a Synergistic and separate effects of plasma and transient heat loads on the microstructure and physical properties of ITER-grade tungsten
260 _ _ |a Stockholm
|c 2021
|b The Royal Swedish Academy of Sciences
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520 _ _ |a Once ITER commences full power operation, the ITER divertor will be exposed to high thermal and particle loads. Tungsten was chosen as plasma facing material for the ITER divertor. It is, therefore, of the utmost importance to understand the behavior of ITER-grade tungsten under conditions similar to those it will have to withstand inside the reactor. In this study, ITER-grade tungsten samples were exposed to stationary D/He(6%) plasma and ELM-like transient heat loads in the linear plasma device PSI-2. The effects of each kind of load was first studied separately, and the synergistic effects obtained when exposed to both loads simultaneously were then analyzed. Additionally, the hardness of a recrystallized tungsten sample after exposure to simultaneous loads was tested via nanoindentation. The results indicate that hydrogen and helium embrittlement worsens the cracking behavior of the material when exposed to the simultaneous loads compared to only heat loads. Additionally, bubbles of up to 1 μm are formed under the surface due to the synergistic effects at the highest heat load. The nanoindentation tests showed that plasma and heat loads increase the hardness of the material by 39%, but only plasma loads appeared to have no effect on it.
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700 1 _ |a Kreter, A.
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700 1 _ |a Unterberg, B.
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700 1 _ |a Wirtz, M.
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