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| 001 | 885390 | ||
| 005 | 20240711113532.0 | ||
| 024 | 7 | _ | |a 10.1016/j.nme.2020.100789 |2 doi |
| 024 | 7 | _ | |a 2128/25885 |2 Handle |
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| 037 | _ | _ | |a FZJ-2020-03787 |
| 082 | _ | _ | |a 624 |
| 100 | 1 | _ | |a Terra, A. |0 P:(DE-Juel1)130166 |b 0 |e Corresponding author |
| 245 | _ | _ | |a Micro-structured tungsten, a high heat flux pulse proof material |
| 260 | _ | _ | |a Amsterdam [u.a.] |c 2020 |b Elsevier |
| 336 | 7 | _ | |a article |2 DRIVER |
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| 520 | _ | _ | |a Micro structured tungsten is a new approach to address one of the main issues of tungsten as high heat flux (HHF) plasma facing material (PFM), which is its brittleness and its propensity to crack formation under pulsed, ELM like, heat loads [2], [3]. With power densities between 100 MW/m2 and 1 GW/m2, progressive thermal fatigue induced damages like roughening, subsequent cracking and even melting will occur in dependence on the pulse number and PFM base temperature. This represents a serious issue for the usage of tungsten as HHF-PFM. In future tokamaks, such as ITER, about 108 ELMs are expected to occur during the operational lifetime.Several approaches have been tried to overcome this brittleness issue, e.g. alloying tungsten with others elements [4] or introducing pseudo-ductility due to the additions of fibres thus creating composites [5]. Micro-structured tungsten showed a significant improvement in comparison with any of these approaches with respect to the damage expected by ELMs. This investigation on both bulk reference and micro-structured tungsten was performed in the PSI-2 facility [8]. A sequential load was applied combining steady state deuterium plasma (5.1×1025 D+ m-2, 51 eV, 240°C, 150 min) loading with laser pulses (up to 105 pulses of 0.5 GW/m2, 3.6 mm spot diameter, 20 J, 1 ms pulse duration, up to 25 Hz pulse frequency). In contrast to reference bulk tungsten, none of the applied loading conditions caused any evident damage on the micro-structured tungsten. The maximum surface temperature within the loaded area measured with a fast pyrometer was increased by about 800°C at the end of the laser exposure for the reference sample. This is related to the emissivity changes and local temperature increase caused by surface degradation. Meanwhile, the micro-structured sample did not show any change of its temperature response from the 10th to the 100 000th pulse. |
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| 773 | _ | _ | |a 10.1016/j.nme.2020.100789 |g p. 100789 - |0 PERI:(DE-600)2808888-8 |p 100789 - |t Nuclear materials and energy |v 25 |y 2020 |x 2352-1791 |
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