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

Antti Hakola, M. I. Airila, N. Mellet, M. Groth, J. Karhunen, T. Kurki-Suonio, T. Makkonen, H. Sillanpää, G. Meisl, M. Oberkofler, ASDEX Upgrade Team

    Research output: Contribution to journalArticleScientificpeer-review

    3 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
    Number of pages6
    JournalNuclear Materials and Energy
    Volume12
    DOIs
    Publication statusPublished - 1 Aug 2017
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Tungsten
    erosion
    Erosion
    tungsten
    cells
    Plasmas
    simulation
    Ion beams
    ion beams
    Impurities
    Magnetic fields
    Fluxes
    deviation
    impurities
    cycles
    estimates
    magnetic fields

    Keywords

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

    Cite this

    Hakola, Antti ; Airila, M. I. ; Mellet, N. ; Groth, M. ; Karhunen, J. ; Kurki-Suonio, T. ; Makkonen, T. ; Sillanpää, H. ; Meisl, G. ; Oberkofler, M. ; ASDEX Upgrade Team. / ERO and PIC simulations of gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade. In: Nuclear Materials and Energy. 2017 ; Vol. 12. pp. 423-428.
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    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.",
    keywords = "ASDEX Upgrade, Cross-field diffusion, ERO modelling, Particle drifts, PIC simulations, Tungsten erosion",
    author = "Antti Hakola and Airila, {M. I.} and N. Mellet and M. Groth and J. Karhunen and T. Kurki-Suonio and T. Makkonen and H. Sillanp{\"a}{\"a} and G. Meisl and M. Oberkofler and {ASDEX Upgrade Team}",
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    ERO and PIC simulations of gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade. / Hakola, Antti; Airila, M. I.; Mellet, N.; Groth, M.; Karhunen, J.; Kurki-Suonio, T.; Makkonen, T.; Sillanpää, H.; Meisl, G.; Oberkofler, M.; ASDEX Upgrade Team.

    In: Nuclear Materials and Energy, Vol. 12, 01.08.2017, p. 423-428.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - ERO and PIC simulations of gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade

    AU - Hakola, Antti

    AU - Airila, M. I.

    AU - Mellet, N.

    AU - Groth, M.

    AU - Karhunen, J.

    AU - Kurki-Suonio, T.

    AU - Makkonen, T.

    AU - Sillanpää, H.

    AU - Meisl, G.

    AU - Oberkofler, M.

    AU - ASDEX Upgrade Team

    PY - 2017/8/1

    Y1 - 2017/8/1

    N2 - 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.

    AB - 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.

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    KW - ERO modelling

    KW - Particle drifts

    KW - PIC simulations

    KW - Tungsten erosion

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