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| 001 | 826069 | ||
| 005 | 20240711114044.0 | ||
| 024 | 7 | _ | |a 10.1016/j.nme.2016.11.002 |2 doi |
| 024 | 7 | _ | |a 2128/15701 |2 Handle |
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| 037 | _ | _ | |a FZJ-2017-00329 |
| 082 | _ | _ | |a 333.7 |
| 100 | 1 | _ | |a Brezinsek, S. |0 P:(DE-Juel1)129976 |b 0 |e Corresponding author |u fzj |
| 245 | _ | _ | |a Surface modification of He pre-exposed tungsten samples by He plasma impact in the divertor manipulator of ASDEX Upgrade |
| 260 | _ | _ | |a Amsterdam [u.a.] |c 2017 |b Elsevier |
| 336 | 7 | _ | |a article |2 DRIVER |
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| 336 | 7 | _ | |a Journal Article |b journal |m journal |0 PUB:(DE-HGF)16 |s 1509024204_28196 |2 PUB:(DE-HGF) |
| 336 | 7 | _ | |a ARTICLE |2 BibTeX |
| 336 | 7 | _ | |a JOURNAL_ARTICLE |2 ORCID |
| 336 | 7 | _ | |a Journal Article |0 0 |2 EndNote |
| 520 | _ | _ | |a Tungsten (W) will be used as material for plasma-facing components (PFCs) in the divertor of ITER and interact with Helium (He) ions either from initial He plasma operation or from Deuterium-Tritium (DT) fusion reactions in the active operation phase. Laboratory experiments reported that in a specific operational window of impact energy, ion fluence, and surface temperature (Ein ≥ 20 eV, ϕ ≥ 1 × 1024 Hem Tsurf ≥ 1000 K) a modification of W surfaces occurs resulting in the formation of He-induced W nanostructures. Experiments in ASDEX Upgrade H-mode plasmas ( T, MA, Paux ≃ 8.0 MW) in He have been carried out to investigate in detail (a) the potential growth of W nanostructures on pre-damaged W samples incorporating He nanobubbles, and (b) the potential ELM-induced erosion of W nanostructure. Both W surface modifications were generated artificially in the GLADIS facility by He bombardment of W samples at keV (a) to ϕ ≃ 0.75 × 1024 He0m at Tsurf ≃ 1800 K and (b) ϕ ≃ 1 × 1024 He0m at Tsurf ≃ 2300 K prior to exposure in the divertor manipulator of ASDEX Upgrade. Though in part (a) conditions of W nanostructure growth with a total He ion fluence of ϕ ≃ 1.6 × 1024 Hem and peak He ion impact energies above 150 eV were met, no growth could be detected. In part (b) lower density plasmas with more pronounced type I ELMs, carrying energetic He ions in the keV range, were executed with the strike-line positioned on 2 µm thick W nanostructure accumulating a fluence of ϕ ≃ 0.8 × 1024 Hem. Post-mortem analysis revealed that co-deposition by predominantly W, and Boron (B), eroded at the main chamber wall and transported into the divertor, took place on all W samples. Erosion of W nanostructure or its formation was hindered by the fact that the outer divertor at the location of the samples was turned under these He plasma conditions into a net deposition zone by W, B and Carbon (C) ions. The surface morphology with large roughness and effective surface area act as a catcher for the impinging impurities. Thus, apart from operation in the existence diagram of W nanostructure with respect to Tsurf, ϕ, and Ein, also the impinging impurity flux contribution needs to be considered in predictions concerning the formation of W nanostructures. |
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| 700 | 1 | _ | |a Oberkofler, M. |0 P:(DE-HGF)0 |b 5 |
| 700 | 1 | _ | |a De Temmerman, G. |0 P:(DE-HGF)0 |b 6 |
| 700 | 1 | _ | |a Douai, D. |0 P:(DE-HGF)0 |b 7 |
| 700 | 1 | _ | |a Lahtinen, A. |0 P:(DE-HGF)0 |b 8 |
| 700 | 1 | _ | |a Böswirth, B. |0 P:(DE-HGF)0 |b 9 |
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| 700 | 1 | _ | |a Caniello, R. |0 P:(DE-HGF)0 |b 11 |
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| 773 | _ | _ | |a 10.1016/j.nme.2016.11.002 |g p. S2352179116302472 |0 PERI:(DE-600)2808888-8 |p 575-581 |t Nuclear materials and energy |v 12 |y 2017 |x 2352-1791 |
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