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| 001 | 891378 | ||
| 005 | 20240711114029.0 | ||
| 024 | 7 | _ | |a 10.1088/1741-4326/abc408 |2 doi |
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| 037 | _ | _ | |a FZJ-2021-01467 |
| 082 | _ | _ | |a 620 |
| 100 | 1 | _ | |a Zhao, D. |0 P:(DE-Juel1)177637 |b 0 |e Corresponding author |
| 245 | _ | _ | |a Quantification of erosion pattern using picosecond-LIBS on a vertical divertor target element exposed in W7-X |
| 260 | _ | _ | |a Vienna |c 2021 |b IAEA |
| 336 | 7 | _ | |a article |2 DRIVER |
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| 520 | _ | _ | |a A set of dedicated marker samples consisting of fine-grain graphite as substrate, an interlayer of 0.2–0.4 μm molybdenum (Mo) employed as marker, and a 5–10 μm thick carbon (C) marker layer on top were installed in Wendelstein 7-X (W7-X) to investigate locally the C erosion and deposition. In this study, a set of five individual marker tiles, installed in a vertical divertor element of the test divertor unit in half-module 50, and exposed to about 40 min of plasma predominant in the standard magnetic divertor configuration in the first year of divertor operation in W7-X (OP1.2A), were retrieved from the vessel for post-mortem analysis. Picosecond laser induced breakdown spectroscopy (ps-LIBS) was applied on these marker tiles in order to determine the local erosion/deposition pattern caused by plasma impact. The general erosion/deposition pattern on the vertical target element was studied with the aid of depth-profiling by Mo line emission due to ps-LIBS with the number of applied laser pulses (355 nm, 2.3 J cm−2, 35 ps) at one probing location. Several potential asymmetry factors which avoid a perfect layer-by-layer ablation process in the laser ablations are proposed and discussed when a rough layered structure sample with a rough surface is analysed by the ps-LIBS technique. Thereby, a simulation model was developed to correct the measurement error of the ps-LIBS method caused by the non-perfect rectangle profile of the applied laser beam. The depth resolution of the applied ps-LIBS system was determined by quantification of the laser ablation rates of the different layers and the C substrate which were measured utilising profilometry and cross comparison with the thicknesses of the C and Mo marker layers determined by a combined focused ion beam and scanning electron microscopy technique. For the first time, the erosion/deposition pattern on the vertical target was mapped and quantified by ps-LIBS technique. A relatively wide net erosion zone with a poloidal extend of about 200 mm was identified which can be correlated to the main particle interaction zone at the magnetic strike-line of the dominantly applied standard magnetic divertor configuration. At the position of peak erosion, not only 7.6 × 1019 C atoms/cm2 but also 2 × 1018 Mo atoms/cm2 which results can be extrapolated to total 15 × 1019 C atoms/cm2, were eroded due to plasma fuel particle (H, He) and impurity (O, C) ion impact. |
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| 700 | 1 | _ | |a Eksaeva, A. |0 P:(DE-Juel1)171509 |b 2 |
| 700 | 1 | _ | |a Oelmann, J. |0 P:(DE-Juel1)169485 |b 3 |
| 700 | 1 | _ | |a Brezinsek, S. |0 P:(DE-Juel1)129976 |b 4 |
| 700 | 1 | _ | |a Sergienko, G. |0 P:(DE-Juel1)130158 |b 5 |
| 700 | 1 | _ | |a Rasinski, M. |0 P:(DE-Juel1)162160 |b 6 |
| 700 | 1 | _ | |a Gao, Y. |0 P:(DE-Juel1)161317 |b 7 |
| 700 | 1 | _ | |a Mayer, M. |0 P:(DE-HGF)0 |b 8 |
| 700 | 1 | _ | |a Dhard, C. P. |0 P:(DE-HGF)0 |b 9 |
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| 700 | 1 | _ | |a Cai, L. |0 0000-0002-7990-3282 |b 11 |
| 773 | _ | _ | |a 10.1088/1741-4326/abc408 |g Vol. 61, no. 1, p. 016025 - |0 PERI:(DE-600)2037980-8 |n 1 |p 016025 - |t Nuclear fusion |v 61 |y 2021 |x 1741-4326 |
| 856 | 4 | _ | |u https://juser.fz-juelich.de/record/891378/files/Zhao_2021_Nucl._Fusion_61_016025.pdf |y Restricted |
| 856 | 4 | _ | |y Published on 2020-12-08. Available in OpenAccess from 2021-12-08. |u https://juser.fz-juelich.de/record/891378/files/Postprint_Zhao_73.pdf |
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