This title appears in the Scientific Report :
2016
Please use the identifier:
http://dx.doi.org/10.1016/j.fusengdes.2015.10.028 in citations.
Impact of the surface quality on the thermal shock performance of beryllium armor tiles for first wall applications
Impact of the surface quality on the thermal shock performance of beryllium armor tiles for first wall applications
Beryllium will be applied as first wall armor material in ITER. The armor has to sustain high steady state and transient power fluxes. For transient events like edge localized modes, these transient power fluxes rise up to 1.0 GW m−2 with a duration of 0.5–0.75 ms in the divertor region and a signif...
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Personal Name(s): | Spilker, Benjamin (Corresponding author) |
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Linke, Jochen / Pintsuk, Gerald / Wirtz, Marius | |
Contributing Institute: |
Werkstoffstruktur und -eigenschaften; IEK-2 Plasmaphysik; IEK-4 |
Published in: | Fusion engineering and design, 109-111 (2015) Part B, S. 1692–1696 |
Imprint: |
New York, NY [u.a.]
Elsevier
2015
|
DOI: |
10.1016/j.fusengdes.2015.10.028 |
Document Type: |
Journal Article |
Research Program: |
Helmholtz Interdisciplinary Doctoral Training in Energy and Climate Research (HITEC) Plasma-Wall-Interaction |
Publikationsportal JuSER |
Beryllium will be applied as first wall armor material in ITER. The armor has to sustain high steady state and transient power fluxes. For transient events like edge localized modes, these transient power fluxes rise up to 1.0 GW m−2 with a duration of 0.5–0.75 ms in the divertor region and a significant fraction of this power flux is deposited on the first wall as well. In the present work, the reference beryllium grade for the ITER first wall application S-65 was prepared with various surface conditions and subjected to transient power fluxes (thermal shocks) with ITER relevant loading parameters. After 1000 thermal shocks, a crucial destruction of the entire loaded area was observed and linked to the stress accelerated grain boundary oxidation (SAGBO)/dynamic embrittlement (DE) effect. Furthermore, the study revealed that the majority of the thermally induced cracks formed between 1 and 10 pulses and then grew wider and deeper with increasing pulse number. The surface quality did not influence the cracking behavior of beryllium in any detectable way. However, the polished surface demonstrated the highest resistance against the observed crucial destruction mechanism. |