This title appears in the Scientific Report :
2015
Please use the identifier:
http://dx.doi.org/10.1016/j.fusengdes.2015.01.028 in citations.
Combined impact of transient heat loads and steady-state plasma exposure on tungsten
Combined impact of transient heat loads and steady-state plasma exposure on tungsten
Cracking thresholds and crack patterns in tungsten targets have been studied in recent experiments after repetitive ITER-like ELM heat pulses in combination with plasma exposure in PSI-2 (Γtarget = 2.5–4.0 × 1021 m−2 s−1, ion energy on surface Eion = 60 eV, Te ≈ 10 eV). The heat pulses were simulate...
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Personal Name(s): | Huber, Alexander (Corresponding author) |
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Wirtz, Marius / Sergienko, Gennady / Steudel, Isabel / Arakcheev, Aleksey / Burdakov, Aleksander / Esser, Hans Guenter / Freisinger, Michaele / Kreter, Arkadi / Linke, Jochen / Linsmeier, Christian / Mertens, Philippe / Möller, Sören / Philipps, Volker / Pintsuk, Gerald / Reinhart, Michael / Schweer, Bernd / Shoshin, Andrey / Terra, Alexis / Unterberg, Bernhard | |
Contributing Institute: |
Plasmaphysik; IEK-4 Werkstoffstruktur und -eigenschaften; IEK-2 |
Published in: | Fusion engineering and design, 98-99 (2015) S. 1328 - 1332 |
Imprint: |
New York, NY [u.a.]
Elsevier
2015
|
DOI: |
10.1016/j.fusengdes.2015.01.028 |
Document Type: |
Journal Article |
Research Program: |
Helmholtz Interdisciplinary Doctoral Training in Energy and Climate Research (HITEC) Plasma-Wall-Interaction |
Publikationsportal JuSER |
Cracking thresholds and crack patterns in tungsten targets have been studied in recent experiments after repetitive ITER-like ELM heat pulses in combination with plasma exposure in PSI-2 (Γtarget = 2.5–4.0 × 1021 m−2 s−1, ion energy on surface Eion = 60 eV, Te ≈ 10 eV). The heat pulses were simulated by laser irradiation. A Nd:YAG laser with energy per pulse of up to 32 J and a duration of 1 ms at the fundamental wavelength (λ = 1064 nm, repetition rate 0.5 Hz) was used to irradiate ITER-grade W samples with repetitive heat loads.In contrast to pure thermal exposure with a laser beam where the damage threshold under pure heat loads for ITER-grade W lies between 0.38 and 0.76 GW/m2, the experiments with pre-loaded W-samples as well as under combined loading conditions show a lower damage threshold of 0.3 GW/m2. This is probably due to deuterium embrittlement and/or a higher defect concentration in a region close to the surface due to supersaturation with deuterium. A pronounced increase in the D retention (more than a factor of five) has been observed during the combined transient heat loads and plasma exposure.Enhanced blister formation has been observed under these combined loading conditions. |