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@ARTICLE{Gago:1024564,
author = {Gago, M. and Kreter, A. and Unterberg, B. and Wirtz, M.},
title = {{S}ynergistic and separate effects of plasma and transient
heat loads on the microstructure and physical properties of
{ITER}-grade tungsten},
journal = {Physica scripta},
volume = {96},
number = {12},
issn = {0031-8949},
address = {Stockholm},
publisher = {The Royal Swedish Academy of Sciences},
reportid = {FZJ-2024-02240},
pages = {124052 -},
year = {2021},
abstract = {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.},
cin = {IEK-4},
ddc = {530},
cid = {I:(DE-Juel1)IEK-4-20101013},
pnm = {134 - Plasma-Wand-Wechselwirkung (POF4-134)},
pid = {G:(DE-HGF)POF4-134},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000714220400001},
doi = {10.1088/1402-4896/ac326c},
url = {https://juser.fz-juelich.de/record/1024564},
}