Dissociation of methane and nitrogen molecules and global transport of tracer impurities in an ASDEX Upgrade L-mode plasma

J. Miettunen (Corresponding Author), Markus Airila, T. Makkonen, M. Groth, V. Lindholm, C. Björkas, Antti Hakola, H.W. Müller, ASDEX Upgrade Team

    Research output: Contribution to journalArticleScientificpeer-review

    3 Citations (Scopus)

    Abstract

    We model the dissociation of injected methane (13CH4) and nitrogen (15N2) molecules and the subsequent transport of tracer ions in ASDEX Upgrade (AUG) low confinement (L-mode) plasma conditions resembling a tracer injection experiment conducted in 2011. Based on simulations with the ERO code, the dissociation is predicted to occur relatively close to the injection port in the far-scrape-off layer (far-SOL) plasma with the dissociation location moving closer to the injection location with increasing plasma density and heating power. Simulations of global transport of the tracer ions resulting from the dissociation using the ASCOT code predict that the decreasing penetration depth of the molecules (dissociation in the far-SOL) increases the ratio between main chamber and divertor deposition.
    Original languageEnglish
    Article number095029
    JournalPlasma Physics and Controlled Fusion
    Volume56
    Issue number9
    DOIs
    Publication statusPublished - 2014
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    tracers
    Methane
    methane
    dissociation
    Impurities
    Nitrogen
    Plasmas
    nitrogen
    impurities
    Molecules
    molecules
    injection
    Plasma heating
    Plasma confinement
    plasma layers
    plasma heating
    Plasma density
    Ions
    plasma density
    ions

    Keywords

    • fusion energy
    • plasma physics
    • impurities
    • methane
    • nitrogen
    • dissociation
    • deposition

    Cite this

    Miettunen, J. ; Airila, Markus ; Makkonen, T. ; Groth, M. ; Lindholm, V. ; Björkas, C. ; Hakola, Antti ; Müller, H.W. ; Team, ASDEX Upgrade. / Dissociation of methane and nitrogen molecules and global transport of tracer impurities in an ASDEX Upgrade L-mode plasma. In: Plasma Physics and Controlled Fusion. 2014 ; Vol. 56, No. 9.
    @article{6f90f9bdfef44e3c92ed8b77b364603e,
    title = "Dissociation of methane and nitrogen molecules and global transport of tracer impurities in an ASDEX Upgrade L-mode plasma",
    abstract = "We model the dissociation of injected methane (13CH4) and nitrogen (15N2) molecules and the subsequent transport of tracer ions in ASDEX Upgrade (AUG) low confinement (L-mode) plasma conditions resembling a tracer injection experiment conducted in 2011. Based on simulations with the ERO code, the dissociation is predicted to occur relatively close to the injection port in the far-scrape-off layer (far-SOL) plasma with the dissociation location moving closer to the injection location with increasing plasma density and heating power. Simulations of global transport of the tracer ions resulting from the dissociation using the ASCOT code predict that the decreasing penetration depth of the molecules (dissociation in the far-SOL) increases the ratio between main chamber and divertor deposition.",
    keywords = "fusion energy, plasma physics, impurities, methane, nitrogen, dissociation, deposition",
    author = "J. Miettunen and Markus Airila and T. Makkonen and M. Groth and V. Lindholm and C. Bj{\"o}rkas and Antti Hakola and H.W. M{\"u}ller and Team, {ASDEX Upgrade}",
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    Dissociation of methane and nitrogen molecules and global transport of tracer impurities in an ASDEX Upgrade L-mode plasma. / Miettunen, J. (Corresponding Author); Airila, Markus; Makkonen, T.; Groth, M.; Lindholm, V.; Björkas, C.; Hakola, Antti; Müller, H.W.; Team, ASDEX Upgrade.

    In: Plasma Physics and Controlled Fusion, Vol. 56, No. 9, 095029, 2014.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Dissociation of methane and nitrogen molecules and global transport of tracer impurities in an ASDEX Upgrade L-mode plasma

    AU - Miettunen, J.

    AU - Airila, Markus

    AU - Makkonen, T.

    AU - Groth, M.

    AU - Lindholm, V.

    AU - Björkas, C.

    AU - Hakola, Antti

    AU - Müller, H.W.

    AU - Team, ASDEX Upgrade

    PY - 2014

    Y1 - 2014

    N2 - We model the dissociation of injected methane (13CH4) and nitrogen (15N2) molecules and the subsequent transport of tracer ions in ASDEX Upgrade (AUG) low confinement (L-mode) plasma conditions resembling a tracer injection experiment conducted in 2011. Based on simulations with the ERO code, the dissociation is predicted to occur relatively close to the injection port in the far-scrape-off layer (far-SOL) plasma with the dissociation location moving closer to the injection location with increasing plasma density and heating power. Simulations of global transport of the tracer ions resulting from the dissociation using the ASCOT code predict that the decreasing penetration depth of the molecules (dissociation in the far-SOL) increases the ratio between main chamber and divertor deposition.

    AB - We model the dissociation of injected methane (13CH4) and nitrogen (15N2) molecules and the subsequent transport of tracer ions in ASDEX Upgrade (AUG) low confinement (L-mode) plasma conditions resembling a tracer injection experiment conducted in 2011. Based on simulations with the ERO code, the dissociation is predicted to occur relatively close to the injection port in the far-scrape-off layer (far-SOL) plasma with the dissociation location moving closer to the injection location with increasing plasma density and heating power. Simulations of global transport of the tracer ions resulting from the dissociation using the ASCOT code predict that the decreasing penetration depth of the molecules (dissociation in the far-SOL) increases the ratio between main chamber and divertor deposition.

    KW - fusion energy

    KW - plasma physics

    KW - impurities

    KW - methane

    KW - nitrogen

    KW - dissociation

    KW - deposition

    U2 - 10.1088/0741-3335/56/9/095029

    DO - 10.1088/0741-3335/56/9/095029

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    JF - Plasma Physics and Controlled Fusion

    SN - 0741-3335

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