Recent progress towards a quantitative description of filamentary SOL transport

D. Carralero, M. Siccinio, M. Komm, S.A. Artene, F.A. D'Isa, J. Adamek, L. Aho-Mantila, G. Birkenmeier, M. Brix, G. Fuchert, M. Groth, T. Lunt, P. Manz, J. Madsen, S. Marsen, H.W. Müller, U. Stroth, H.J. Sun, N. Vianello, M. WischmeierE. Wolfrum

    Research output: Contribution to journalArticleScientificpeer-review

    15 Citations (Scopus)

    Abstract

    A summary of recent results on filamentary transport, mostly obtained with the ASDEX-Upgrade tokamak (AUG), is presented and discussed in an attempt to produce a coherent picture of scrape-off layer (SOL) filamentary transport. A clear correlation is found between L-mode density shoulder formation in the outer midplane and a transition between the sheath-limited and the inertial filamentary regimes. Divertor collisionality is found to be the parameter triggering the transition. A clear reduction of the ion temperature takes place in the far SOL after the transition, both for the background and the filaments. This coincides with a strong variation of the ion temperature distribution, which deviates from Gaussianity and becomes dominated by a strong peak below 5?eV. The filament transition mechanism triggered by a critical value of collisionality seems to be generally applicable to inter-ELM H-mode plasmas, although a secondary threshold related to deuterium fueling is observed. EMC3-EIRENE simulations of neutral dynamics show that an ionization front near the main chamber wall is formed after the shoulder formation. Finally, a clear increase of SOL opacity to neutrals is observed, associated with the shoulder formation. A common SOL transport framework is proposed to account for all these results, and their potential implications for future generation devices are discussed.
    Original languageEnglish
    Article number056044
    JournalNuclear Fusion
    Volume57
    Issue number5
    DOIs
    Publication statusPublished - 11 Apr 2017
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    shoulders
    ion temperature
    filaments
    refueling
    opacity
    sheaths
    deuterium
    temperature distribution
    chambers
    ionization
    thresholds
    simulation

    Keywords

    • ASDEX-Upgrade
    • filaments
    • main wall recycling
    • SOL transport

    Cite this

    Carralero, D., Siccinio, M., Komm, M., Artene, S. A., D'Isa, F. A., Adamek, J., ... Wolfrum, E. (2017). Recent progress towards a quantitative description of filamentary SOL transport. Nuclear Fusion, 57(5), [056044]. https://doi.org/10.1088/1741-4326/aa64b3
    Carralero, D. ; Siccinio, M. ; Komm, M. ; Artene, S.A. ; D'Isa, F.A. ; Adamek, J. ; Aho-Mantila, L. ; Birkenmeier, G. ; Brix, M. ; Fuchert, G. ; Groth, M. ; Lunt, T. ; Manz, P. ; Madsen, J. ; Marsen, S. ; Müller, H.W. ; Stroth, U. ; Sun, H.J. ; Vianello, N. ; Wischmeier, M. ; Wolfrum, E. / Recent progress towards a quantitative description of filamentary SOL transport. In: Nuclear Fusion. 2017 ; Vol. 57, No. 5.
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    abstract = "A summary of recent results on filamentary transport, mostly obtained with the ASDEX-Upgrade tokamak (AUG), is presented and discussed in an attempt to produce a coherent picture of scrape-off layer (SOL) filamentary transport. A clear correlation is found between L-mode density shoulder formation in the outer midplane and a transition between the sheath-limited and the inertial filamentary regimes. Divertor collisionality is found to be the parameter triggering the transition. A clear reduction of the ion temperature takes place in the far SOL after the transition, both for the background and the filaments. This coincides with a strong variation of the ion temperature distribution, which deviates from Gaussianity and becomes dominated by a strong peak below 5?eV. The filament transition mechanism triggered by a critical value of collisionality seems to be generally applicable to inter-ELM H-mode plasmas, although a secondary threshold related to deuterium fueling is observed. EMC3-EIRENE simulations of neutral dynamics show that an ionization front near the main chamber wall is formed after the shoulder formation. Finally, a clear increase of SOL opacity to neutrals is observed, associated with the shoulder formation. A common SOL transport framework is proposed to account for all these results, and their potential implications for future generation devices are discussed.",
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    author = "D. Carralero and M. Siccinio and M. Komm and S.A. Artene and F.A. D'Isa and J. Adamek and L. Aho-Mantila and G. Birkenmeier and M. Brix and G. Fuchert and M. Groth and T. Lunt and P. Manz and J. Madsen and S. Marsen and H.W. M{\"u}ller and U. Stroth and H.J. Sun and N. Vianello and M. Wischmeier and E. Wolfrum",
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    Carralero, D, Siccinio, M, Komm, M, Artene, SA, D'Isa, FA, Adamek, J, Aho-Mantila, L, Birkenmeier, G, Brix, M, Fuchert, G, Groth, M, Lunt, T, Manz, P, Madsen, J, Marsen, S, Müller, HW, Stroth, U, Sun, HJ, Vianello, N, Wischmeier, M & Wolfrum, E 2017, 'Recent progress towards a quantitative description of filamentary SOL transport', Nuclear Fusion, vol. 57, no. 5, 056044. https://doi.org/10.1088/1741-4326/aa64b3

    Recent progress towards a quantitative description of filamentary SOL transport. / Carralero, D.; Siccinio, M.; Komm, M.; Artene, S.A.; D'Isa, F.A.; Adamek, J.; Aho-Mantila, L.; Birkenmeier, G.; Brix, M.; Fuchert, G.; Groth, M.; Lunt, T.; Manz, P.; Madsen, J.; Marsen, S.; Müller, H.W.; Stroth, U.; Sun, H.J.; Vianello, N.; Wischmeier, M.; Wolfrum, E.

    In: Nuclear Fusion, Vol. 57, No. 5, 056044, 11.04.2017.

    Research output: Contribution to journalArticleScientificpeer-review

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    T1 - Recent progress towards a quantitative description of filamentary SOL transport

    AU - Carralero, D.

    AU - Siccinio, M.

    AU - Komm, M.

    AU - Artene, S.A.

    AU - D'Isa, F.A.

    AU - Adamek, J.

    AU - Aho-Mantila, L.

    AU - Birkenmeier, G.

    AU - Brix, M.

    AU - Fuchert, G.

    AU - Groth, M.

    AU - Lunt, T.

    AU - Manz, P.

    AU - Madsen, J.

    AU - Marsen, S.

    AU - Müller, H.W.

    AU - Stroth, U.

    AU - Sun, H.J.

    AU - Vianello, N.

    AU - Wischmeier, M.

    AU - Wolfrum, E.

    PY - 2017/4/11

    Y1 - 2017/4/11

    N2 - A summary of recent results on filamentary transport, mostly obtained with the ASDEX-Upgrade tokamak (AUG), is presented and discussed in an attempt to produce a coherent picture of scrape-off layer (SOL) filamentary transport. A clear correlation is found between L-mode density shoulder formation in the outer midplane and a transition between the sheath-limited and the inertial filamentary regimes. Divertor collisionality is found to be the parameter triggering the transition. A clear reduction of the ion temperature takes place in the far SOL after the transition, both for the background and the filaments. This coincides with a strong variation of the ion temperature distribution, which deviates from Gaussianity and becomes dominated by a strong peak below 5?eV. The filament transition mechanism triggered by a critical value of collisionality seems to be generally applicable to inter-ELM H-mode plasmas, although a secondary threshold related to deuterium fueling is observed. EMC3-EIRENE simulations of neutral dynamics show that an ionization front near the main chamber wall is formed after the shoulder formation. Finally, a clear increase of SOL opacity to neutrals is observed, associated with the shoulder formation. A common SOL transport framework is proposed to account for all these results, and their potential implications for future generation devices are discussed.

    AB - A summary of recent results on filamentary transport, mostly obtained with the ASDEX-Upgrade tokamak (AUG), is presented and discussed in an attempt to produce a coherent picture of scrape-off layer (SOL) filamentary transport. A clear correlation is found between L-mode density shoulder formation in the outer midplane and a transition between the sheath-limited and the inertial filamentary regimes. Divertor collisionality is found to be the parameter triggering the transition. A clear reduction of the ion temperature takes place in the far SOL after the transition, both for the background and the filaments. This coincides with a strong variation of the ion temperature distribution, which deviates from Gaussianity and becomes dominated by a strong peak below 5?eV. The filament transition mechanism triggered by a critical value of collisionality seems to be generally applicable to inter-ELM H-mode plasmas, although a secondary threshold related to deuterium fueling is observed. EMC3-EIRENE simulations of neutral dynamics show that an ionization front near the main chamber wall is formed after the shoulder formation. Finally, a clear increase of SOL opacity to neutrals is observed, associated with the shoulder formation. A common SOL transport framework is proposed to account for all these results, and their potential implications for future generation devices are discussed.

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    KW - filaments

    KW - main wall recycling

    KW - SOL transport

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    U2 - 10.1088/1741-4326/aa64b3

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    Carralero D, Siccinio M, Komm M, Artene SA, D'Isa FA, Adamek J et al. Recent progress towards a quantitative description of filamentary SOL transport. Nuclear Fusion. 2017 Apr 11;57(5). 056044. https://doi.org/10.1088/1741-4326/aa64b3