%0 Journal Article
%A Lemahieu, Nathan
%A Greuner, Henri
%A Linke, Jochen
%A Maier, Hans
%A Pintsuk, Gerald
%A Van Oost, Guido
%A Wirtz, Marius
%T Synergistic Effects of ELMs and Steady State H and H/He Irradiation on Tungsten
%J Fusion engineering and design
%V 98-99
%@ 0920-3796
%C New York, NY [u.a.]
%I Elsevier
%M FZJ-2015-07458
%P 2020 - 2024
%D 2015
%X To investigate synergistic effects of high heat flux loading on H and H/He loaded tungsten surfaces, specimens were exposed to a 30 keV steady-state H or H/He beam and subsequently loaded with an electron beam to simulate ELMs. The heat flux during the H and H/He loading was 10.5 MW m−2, while a 2 × 1025 m−2 fluence was reached. After exposure, all specimens exhibited an altered surface morphology. The H/He samples with a surface temperature of 1000 °C and 1500 °C had a multitude of surface extrusions. Afterwards the particle loaded samples were exposed to 100 ELM-like pulses around the material's damage threshold. Transient heat fluxes of 190 MW m−2 and 380 MW m−2 were applied at room temperature and 400 °C for a duration of 1 ms. Post-mortem analysis showed no deterioration of thermal shock resistance in comparison with polished material. For some tests the reference specimens roughened or cracked while the H or H/He exposed material had no damage. The H-content and the H/He-induced cavities and/or extrusions are suggested as two potential causes for this change in material behaviour.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000363344900216
%R 10.1016/j.fusengdes.2015.06.051
%U https://juser.fz-juelich.de/record/279574