Measurement of N+ flows in the high-field side scrape-off layer of ASDEX upgrade with different degrees of inner divertor detachment

J. Karhunen (Corresponding Author), M. Groth, P. Heliste, T. Pütterich, E. Viezzer, D. Carralero, D. Coster, L. Guimarais, A. Hakola, V. Nikolaeva, S. Potzel, ASDEX Update Group

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    Toroidal and poloidal flows of injected N+ ions were measured in the high-field side (HFS) scrape-off layer (SOL) of ASDEX Upgrade by Doppler spectroscopy with different degrees of HFS divertor detachment. In high-recycling conditions, the results suggest reversed parallel N+ flow away from the inner divertor in the near SOL close to the separatrix, while the flow is towards the inner divertor throughout the SOL in detached conditions. The measured poloidal N+ flows were directed away from the HFS divertor in the near SOL for all density cases. Divertor plasma oscillations, characterized by momentary peaking of the HFS target ion flux and decrease of the HFS SOL density, were observed slightly before the roll-over of the ion saturation current to the HFS target and lead to an increase in the N+ flow towards the HFS divertor. SOLPS and ERO simulations of the experiment predict entrainment below 50% between the velocities of N+ and D+ ions, suggesting that N+ ions are quantitatively a limited proxy for measuring D+ flows. ERO simulations show significantly higher entrainment for higher ionization states, e.g., N2+ and N3+.
    Original languageEnglish
    Pages (from-to)935-941
    Number of pages7
    JournalNuclear Materials and Energy
    Volume12
    Early online date2017
    DOIs
    Publication statusPublished - 1 Aug 2017
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    detachment
    Ions
    entrainment
    ions
    Plasma oscillations
    Ionization
    Recycling
    plasma oscillations
    recycling
    Spectroscopy
    Fluxes
    simulation
    saturation
    ionization
    Experiments
    spectroscopy

    Keywords

    • impurity migration
    • Doppler spectroscopy
    • SOL flow
    • divertor detachment

    Cite this

    Karhunen, J. ; Groth, M. ; Heliste, P. ; Pütterich, T. ; Viezzer, E. ; Carralero, D. ; Coster, D. ; Guimarais, L. ; Hakola, A. ; Nikolaeva, V. ; Potzel, S. ; ASDEX Update Group. / Measurement of N+ flows in the high-field side scrape-off layer of ASDEX upgrade with different degrees of inner divertor detachment. In: Nuclear Materials and Energy. 2017 ; Vol. 12. pp. 935-941.
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    title = "Measurement of N+ flows in the high-field side scrape-off layer of ASDEX upgrade with different degrees of inner divertor detachment",
    abstract = "Toroidal and poloidal flows of injected N+ ions were measured in the high-field side (HFS) scrape-off layer (SOL) of ASDEX Upgrade by Doppler spectroscopy with different degrees of HFS divertor detachment. In high-recycling conditions, the results suggest reversed parallel N+ flow away from the inner divertor in the near SOL close to the separatrix, while the flow is towards the inner divertor throughout the SOL in detached conditions. The measured poloidal N+ flows were directed away from the HFS divertor in the near SOL for all density cases. Divertor plasma oscillations, characterized by momentary peaking of the HFS target ion flux and decrease of the HFS SOL density, were observed slightly before the roll-over of the ion saturation current to the HFS target and lead to an increase in the N+ flow towards the HFS divertor. SOLPS and ERO simulations of the experiment predict entrainment below 50{\%} between the velocities of N+ and D+ ions, suggesting that N+ ions are quantitatively a limited proxy for measuring D+ flows. ERO simulations show significantly higher entrainment for higher ionization states, e.g., N2+ and N3+.",
    keywords = "impurity migration, Doppler spectroscopy, SOL flow, divertor detachment",
    author = "J. Karhunen and M. Groth and P. Heliste and T. P{\"u}tterich and E. Viezzer and D. Carralero and D. Coster and L. Guimarais and A. Hakola and V. Nikolaeva and S. Potzel and {ASDEX Update Group}",
    year = "2017",
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    language = "English",
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    Karhunen, J, Groth, M, Heliste, P, Pütterich, T, Viezzer, E, Carralero, D, Coster, D, Guimarais, L, Hakola, A, Nikolaeva, V, Potzel, S & ASDEX Update Group 2017, 'Measurement of N+ flows in the high-field side scrape-off layer of ASDEX upgrade with different degrees of inner divertor detachment', Nuclear Materials and Energy, vol. 12, pp. 935-941. https://doi.org/10.1016/j.nme.2017.02.020

    Measurement of N+ flows in the high-field side scrape-off layer of ASDEX upgrade with different degrees of inner divertor detachment. / Karhunen, J. (Corresponding Author); Groth, M.; Heliste, P.; Pütterich, T.; Viezzer, E.; Carralero, D.; Coster, D.; Guimarais, L.; Hakola, A.; Nikolaeva, V.; Potzel, S.; ASDEX Update Group.

    In: Nuclear Materials and Energy, Vol. 12, 01.08.2017, p. 935-941.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Measurement of N+ flows in the high-field side scrape-off layer of ASDEX upgrade with different degrees of inner divertor detachment

    AU - Karhunen, J.

    AU - Groth, M.

    AU - Heliste, P.

    AU - Pütterich, T.

    AU - Viezzer, E.

    AU - Carralero, D.

    AU - Coster, D.

    AU - Guimarais, L.

    AU - Hakola, A.

    AU - Nikolaeva, V.

    AU - Potzel, S.

    AU - ASDEX Update Group

    PY - 2017/8/1

    Y1 - 2017/8/1

    N2 - Toroidal and poloidal flows of injected N+ ions were measured in the high-field side (HFS) scrape-off layer (SOL) of ASDEX Upgrade by Doppler spectroscopy with different degrees of HFS divertor detachment. In high-recycling conditions, the results suggest reversed parallel N+ flow away from the inner divertor in the near SOL close to the separatrix, while the flow is towards the inner divertor throughout the SOL in detached conditions. The measured poloidal N+ flows were directed away from the HFS divertor in the near SOL for all density cases. Divertor plasma oscillations, characterized by momentary peaking of the HFS target ion flux and decrease of the HFS SOL density, were observed slightly before the roll-over of the ion saturation current to the HFS target and lead to an increase in the N+ flow towards the HFS divertor. SOLPS and ERO simulations of the experiment predict entrainment below 50% between the velocities of N+ and D+ ions, suggesting that N+ ions are quantitatively a limited proxy for measuring D+ flows. ERO simulations show significantly higher entrainment for higher ionization states, e.g., N2+ and N3+.

    AB - Toroidal and poloidal flows of injected N+ ions were measured in the high-field side (HFS) scrape-off layer (SOL) of ASDEX Upgrade by Doppler spectroscopy with different degrees of HFS divertor detachment. In high-recycling conditions, the results suggest reversed parallel N+ flow away from the inner divertor in the near SOL close to the separatrix, while the flow is towards the inner divertor throughout the SOL in detached conditions. The measured poloidal N+ flows were directed away from the HFS divertor in the near SOL for all density cases. Divertor plasma oscillations, characterized by momentary peaking of the HFS target ion flux and decrease of the HFS SOL density, were observed slightly before the roll-over of the ion saturation current to the HFS target and lead to an increase in the N+ flow towards the HFS divertor. SOLPS and ERO simulations of the experiment predict entrainment below 50% between the velocities of N+ and D+ ions, suggesting that N+ ions are quantitatively a limited proxy for measuring D+ flows. ERO simulations show significantly higher entrainment for higher ionization states, e.g., N2+ and N3+.

    KW - impurity migration

    KW - Doppler spectroscopy

    KW - SOL flow

    KW - divertor detachment

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    U2 - 10.1016/j.nme.2017.02.020

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