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@ARTICLE{Buzi:837211,
author = {Buzi, Luxherta and De Temmerman, Gregory and Huisman,
Arnout E and Bardin, Sebastien and Morgan, T. W. and
Rasinski, Marcin and Pitts, Richard A and Van Oost, Guido},
title = {{R}esponse of tungsten surfaces to helium and hydrogen
plasma exposure under {ITER} relevant steady state and
repetitive transient conditions},
journal = {Nuclear fusion},
volume = {57},
issn = {1741-4326},
address = {Vienna},
publisher = {IAEA},
reportid = {FZJ-2017-06186},
pages = {12},
year = {2017},
abstract = {The effect of helium (He) plasma exposure, and associated
surface modifications, on the thermal shock resistance of
tungsten (W) under ITER relevant steady state and transient
heat and particle loads was studied. W samples were exposed
to steady state and pulsed He plasmas at surface base
temperatures from 670 to 1170 K. The same exposures were
repeated in hydrogen (H) to allow a direct comparison of the
role of the ion species on the thermal shock resistance.
Exposure to He plasma pulses caused the formation of fine
cracking network on W samples which occurred at a higher
density and smaller depths compared to H pulsed plasma
irradiation. The peak temperature reached during an ELM-like
plasma pulse increased by a factor ~1.45 over the 100 s of
He plasma exposure, indicating a deterioration of the
thermal properties. Transient loading experiments were also
performed using a high power pulsed laser during He plasma
exposure, showing a significant modification of the target
thermal response caused by the surface damage. The effect of
He-induced morphology changes on the thermal response
modification was found to be very small compared to that of
transient-induced damage.},
cin = {IEK-4},
ddc = {530},
cid = {I:(DE-Juel1)IEK-4-20101013},
pnm = {174 - Plasma-Wall-Interaction (POF3-174)},
pid = {G:(DE-HGF)POF3-174},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000410593800002},
doi = {10.1088/1741-4326/aa81e4},
url = {https://juser.fz-juelich.de/record/837211},
}