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

    10 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

    Funding

    This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014–2018 under grant agreement number 633053.

    Keywords

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

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