This title appears in the Scientific Report :
2021
The impact of surface morphology on the erosion of metallic surfaces - modelling with the 3D Monte-Carlo code ERO2.0
The impact of surface morphology on the erosion of metallic surfaces - modelling with the 3D Monte-Carlo code ERO2.0
The impact of surface morphology on the erosion of metallic surfaces - modelling with the 3D Monte-Carlo code ERO2.0 A. Eksaeva1*, D. Borodin1, J. Romazanov1, A. Kirschner1, I. Borodkina1, A. Kreter1, B.Göths1, M. Rasinski1, B. Unterberg1, S. Brezinsek1, Ch. Linsmeier1, E.Vassallo2, M. Passoni2,3, D...
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Personal Name(s): | Eksaeva, Alina (Corresponding author) |
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Borodin, D. / Romazanov, J. / Kirschner, A. / Borodkina, Irina / Kreter, A. / Göths, B. / Rasinski, M. / Unterberg, B. / Brezinsek, S. / Linsmeier, Ch. / Vassallo, E. / Passoni, M. / Dellasega, D. / Sala, M. / Romeo, F. | |
Contributing Institute: |
Plasmaphysik; IEK-4 |
Imprint: |
2021
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Conference: | 24th International Conference on Plasma Surface Interactions in Controlled Fusion Devices (PSI 2020), virtuell (virtuell), 2021-01-25 - 2021-01-29 |
Document Type: |
Abstract |
Research Program: |
Plasma-Wand-Wechselwirkung |
Publikationsportal JuSER |
The impact of surface morphology on the erosion of metallic surfaces - modelling with the 3D Monte-Carlo code ERO2.0 A. Eksaeva1*, D. Borodin1, J. Romazanov1, A. Kirschner1, I. Borodkina1, A. Kreter1, B.Göths1, M. Rasinski1, B. Unterberg1, S. Brezinsek1, Ch. Linsmeier1, E.Vassallo2, M. Passoni2,3, D. Dellasega2,3, M. Sala3, F. Romeo31 Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung – Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), Jülich, Germany2 Istituto per la Scienza e Tecnologia dei Plasmi, CNR, Milano, Italy3 Dipartimento di Energia, Politecnico di Milano, Via Ponzio 34/3, 20133 Milan, ItalyCorr. author: a.eksaeva@fz-juelich.deThe surface roughness of metallic surfaces has a vital impact on the erosion of plasma-facing surfaces and determines the a) the effective sputtering yield Yeff, b) the angular/energy distribution of sputtered particles, and c) the spatial erosion and deposition distribution. The 3D Monte-Carlo code ERO2.0 is a tool for describing the erosion and transport of impurities in the plasma and is capable to simulate complex wall geometries like e.g. the first wall of toroidal devices like JET and ITER [1]. In the present contribution the effect of surface roughness is implemented into the ERO2.0 taking advantage of its flexibility regarding surface geometries, capability of modelling incident plasma flux including the magnetic field and sheath effects and massive parallelization. To use the code on the micro-scale several modifications were introduced including various types of regular/irregular structures representative of rough surfaces and surface evolution during the plasma exposure due to the physical sputtering and re-deposition. Validation of the surface topography time-evolution algorithm were carried out using available ion-beam experiments [2] and good agreement between ERO2.0 simulations and experimental observations was achieved.A series of plasma experiment aiming at the detailed study of the surface roughness effect on the material sputtering and transport have been carried out at the linear plasma device PSI-2. 16 molybdenum (Mo) samples with different predefined roughness types (Ra = 110-600 nm) were irradiated with helium (He) plasma at an impact energy of ≈90 eV by basing. Mass loss, optical emission spectroscopy, atomic force microscopy, secondary electron microscopy and ERO2.0 simulations were utilized for interpretation of the obtained results. The experiments show a reduction of the net erosion by up to 40% due to the surface roughness in comparison to the smooth case, which is in line with predictive ERO2.0 simulations. The developed ERO2.0 surface morphology model was applied to the JET ITER-like wall (JET-ILW) divertor. It is shown, that in the case of the oblique magnetic field typical for tokamaks, surface roughness of ~10 mcm scale leads to the suppression of erosion by the factor ≤2, however no significant impact on the transport of sputtered material is present. In general, deposition in the rough surface “valleys” and erosion of surface “peaks” is observed. The latter leads to reduced net erosion of rough W-coated surfaces (Tile 6 of the JET-ILW divertor) in comparison to smooth bulk-W surfaces (Tile 5) by up to 50%, which is in agreement with experimental observations [2]. The temporal evolution of the erosion-deposition patterns on the rough surface over the campaign-sale time (6 hours) has been investigated.[1] Romazanov, J., et al. NME 18 (2019): 331-338 [3] Mayer, M., et al. Physica Scripta 170 (2017)[2] Arredondo, R., et al. 17th International PFMC Conference (PFMC-17) 2019. |