ERO and PIC simulations of gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade

Antti Hakola, Markus I. Airila, Nicolas Mellet, M. Groth, J. Karhunen, T. Kurki-Suonio, Tapani Makkonen, Harri Sillanpää, G. Meisl, M. Oberkofler, ASDEX Upgrade Team

    Research output: Contribution to journalArticleScientificpeer-review

    7 Citations (Scopus)

    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.
    Original languageEnglish
    Pages (from-to)423-428
    JournalNuclear Materials and Energy
    Volume12
    DOIs
    Publication statusPublished - 1 Aug 2017
    MoE publication typeA1 Journal article-refereed

    Keywords

    • ASDEX Upgrade
    • Cross-field diffusion
    • ERO modelling
    • Particle drifts
    • PIC simulations
    • Tungsten erosion

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