ERO and PIC simulations of gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2017-08
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en
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Nuclear Materials and Energy, Volume 12, pp. 423-428
Abstract
We have modelled net and gross erosion of W in low-density . l-mode plasmas in the low-field side strike point region of ASDEX Upgrade by ERO and Particle-in-Cell (PIC) simulations. The observed net-erosion peak at the strike point was mainly due to the light impurities present in the plasma while the noticeable net-deposition regions surrounding the erosion maximum could be attributed to the strong . E ×. B drift and the magnetic field bringing eroded particles from a distance of several meters towards the private flux region. Our results also imply that the role of cross-field diffusion is very small in the studied plasmas. The simulations indicate net/gross erosion ratio of 0.2-0.6, which is in line with the literature data and what was determined spectroscopically. The deviations from the estimates extracted from post-exposure ion-beam-analysis data (∼0.6-0.7) are most likely due to the measured re-deposition patterns showing the outcomes of multiple erosion-deposition cycles.Description
Keywords
ASDEX Upgrade, Cross-field diffusion, ERO modelling, Particle drifts, PIC simulations, Tungsten erosion
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Hakola, A, Airila, M I, Mellet, N, Groth, M, Karhunen, J, Kurki-Suonio, T, Makkonen, T, Sillanpää, H, Meisl, G, Oberkofler, M & ASDEX Upgrade Team 2017, ' ERO and PIC simulations of gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade ', Nuclear Materials and Energy, vol. 12, pp. 423-428 . https://doi.org/10.1016/j.nme.2016.09.012