Dynamics of fast ions during sawtooth oscillations in the TEXTOR tokamak measured by collective Thomson scattering

Stefan Kragh Nielsen, Mirko Salewski, Henrik Bindslev, A. Bürger, Vedran Furtula, M. Kantor, Søren Bang Korsholm, H.R. Koslowski, A. Krämer-Flecken, Frank Leipold, Fernando Meo, Poul Michelsen, Dmitry Moseev, J.W. Oosterbeek, Morten Stejner Pedersen, E. Westerhof

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Experimental investigations of sawteeth interaction with fast ions measured by collective Thomson scattering on TEXTOR are presented. Time-resolved measurements of localized 1D fast-ion distribution functions allow us to study fast-ion dynamics during several sawtooth cycles. Sawtooth oscillations interact strongly with the fast-ion population in a wide range of plasma parameters. Part of the ion phase space density oscillates out of phase with the sawtooth oscillation during hydrogen neutral beam injection (NBI). These oscillations most likely originate from fast hydrogen ions with energies close to the full injection energy. At lower energies passing fast ions in the plasma centre are strongly redistributed at the time of sawtooth collapse but no redistribution of trapped fast ions is observed. The redistribution of fast ions from deuterium NBI in the plasma centre is found to vary throughout velocity space. The reduction is most pronounced for passing ions. We find no evidence of inverted sawteeth outside the sawtooth inversion surface in the fast-ion distribution function.

    Original languageEnglish
    JournalNuclear Fusion
    Volume51
    Issue number6
    Pages (from-to)063014
    ISSN0029-5515
    DOIs
    Publication statusPublished - Jun 2011

    Keywords

    • Fusion energy

    Cite this

    Nielsen, Stefan Kragh ; Salewski, Mirko ; Bindslev, Henrik ; Bürger, A. ; Furtula, Vedran ; Kantor, M. ; Korsholm, Søren Bang ; Koslowski, H.R. ; Krämer-Flecken, A. ; Leipold, Frank ; Meo, Fernando ; Michelsen, Poul ; Moseev, Dmitry ; Oosterbeek, J.W. ; Stejner Pedersen, Morten ; Westerhof, E. / Dynamics of fast ions during sawtooth oscillations in the TEXTOR tokamak measured by collective Thomson scattering. In: Nuclear Fusion. 2011 ; Vol. 51, No. 6. pp. 063014.
    @article{e629002168b145cd82025868a525697e,
    title = "Dynamics of fast ions during sawtooth oscillations in the TEXTOR tokamak measured by collective Thomson scattering",
    abstract = "Experimental investigations of sawteeth interaction with fast ions measured by collective Thomson scattering on TEXTOR are presented. Time-resolved measurements of localized 1D fast-ion distribution functions allow us to study fast-ion dynamics during several sawtooth cycles. Sawtooth oscillations interact strongly with the fast-ion population in a wide range of plasma parameters. Part of the ion phase space density oscillates out of phase with the sawtooth oscillation during hydrogen neutral beam injection (NBI). These oscillations most likely originate from fast hydrogen ions with energies close to the full injection energy. At lower energies passing fast ions in the plasma centre are strongly redistributed at the time of sawtooth collapse but no redistribution of trapped fast ions is observed. The redistribution of fast ions from deuterium NBI in the plasma centre is found to vary throughout velocity space. The reduction is most pronounced for passing ions. We find no evidence of inverted sawteeth outside the sawtooth inversion surface in the fast-ion distribution function.",
    keywords = "Fusion energy, Fusionsenergiforskning",
    author = "Nielsen, {Stefan Kragh} and Mirko Salewski and Henrik Bindslev and A. B{\"u}rger and Vedran Furtula and M. Kantor and Korsholm, {S{\o}ren Bang} and H.R. Koslowski and A. Kr{\"a}mer-Flecken and Frank Leipold and Fernando Meo and Poul Michelsen and Dmitry Moseev and J.W. Oosterbeek and {Stejner Pedersen}, Morten and E. Westerhof",
    year = "2011",
    month = "6",
    doi = "10.1088/0029-5515/51/6/063014",
    language = "English",
    volume = "51",
    pages = "063014",
    journal = "Nuclear Fusion",
    issn = "0029-5515",
    publisher = "IOP Publishing",
    number = "6",

    }

    Nielsen, SK, Salewski, M, Bindslev, H, Bürger, A, Furtula, V, Kantor, M, Korsholm, SB, Koslowski, HR, Krämer-Flecken, A, Leipold, F, Meo, F, Michelsen, P, Moseev, D, Oosterbeek, JW, Stejner Pedersen, M & Westerhof, E 2011, 'Dynamics of fast ions during sawtooth oscillations in the TEXTOR tokamak measured by collective Thomson scattering', Nuclear Fusion, vol. 51, no. 6, pp. 063014. https://doi.org/10.1088/0029-5515/51/6/063014

    Dynamics of fast ions during sawtooth oscillations in the TEXTOR tokamak measured by collective Thomson scattering. / Nielsen, Stefan Kragh; Salewski, Mirko; Bindslev, Henrik; Bürger, A.; Furtula, Vedran; Kantor, M.; Korsholm, Søren Bang; Koslowski, H.R.; Krämer-Flecken, A.; Leipold, Frank; Meo, Fernando; Michelsen, Poul; Moseev, Dmitry; Oosterbeek, J.W.; Stejner Pedersen, Morten; Westerhof, E.

    In: Nuclear Fusion, Vol. 51, No. 6, 06.2011, p. 063014.

    Research output: Contribution to journalJournal articleResearchpeer-review

    TY - JOUR

    T1 - Dynamics of fast ions during sawtooth oscillations in the TEXTOR tokamak measured by collective Thomson scattering

    AU - Nielsen, Stefan Kragh

    AU - Salewski, Mirko

    AU - Bindslev, Henrik

    AU - Bürger, A.

    AU - Furtula, Vedran

    AU - Kantor, M.

    AU - Korsholm, Søren Bang

    AU - Koslowski, H.R.

    AU - Krämer-Flecken, A.

    AU - Leipold, Frank

    AU - Meo, Fernando

    AU - Michelsen, Poul

    AU - Moseev, Dmitry

    AU - Oosterbeek, J.W.

    AU - Stejner Pedersen, Morten

    AU - Westerhof, E.

    PY - 2011/6

    Y1 - 2011/6

    N2 - Experimental investigations of sawteeth interaction with fast ions measured by collective Thomson scattering on TEXTOR are presented. Time-resolved measurements of localized 1D fast-ion distribution functions allow us to study fast-ion dynamics during several sawtooth cycles. Sawtooth oscillations interact strongly with the fast-ion population in a wide range of plasma parameters. Part of the ion phase space density oscillates out of phase with the sawtooth oscillation during hydrogen neutral beam injection (NBI). These oscillations most likely originate from fast hydrogen ions with energies close to the full injection energy. At lower energies passing fast ions in the plasma centre are strongly redistributed at the time of sawtooth collapse but no redistribution of trapped fast ions is observed. The redistribution of fast ions from deuterium NBI in the plasma centre is found to vary throughout velocity space. The reduction is most pronounced for passing ions. We find no evidence of inverted sawteeth outside the sawtooth inversion surface in the fast-ion distribution function.

    AB - Experimental investigations of sawteeth interaction with fast ions measured by collective Thomson scattering on TEXTOR are presented. Time-resolved measurements of localized 1D fast-ion distribution functions allow us to study fast-ion dynamics during several sawtooth cycles. Sawtooth oscillations interact strongly with the fast-ion population in a wide range of plasma parameters. Part of the ion phase space density oscillates out of phase with the sawtooth oscillation during hydrogen neutral beam injection (NBI). These oscillations most likely originate from fast hydrogen ions with energies close to the full injection energy. At lower energies passing fast ions in the plasma centre are strongly redistributed at the time of sawtooth collapse but no redistribution of trapped fast ions is observed. The redistribution of fast ions from deuterium NBI in the plasma centre is found to vary throughout velocity space. The reduction is most pronounced for passing ions. We find no evidence of inverted sawteeth outside the sawtooth inversion surface in the fast-ion distribution function.

    KW - Fusion energy

    KW - Fusionsenergiforskning

    U2 - 10.1088/0029-5515/51/6/063014

    DO - 10.1088/0029-5515/51/6/063014

    M3 - Journal article

    VL - 51

    SP - 063014

    JO - Nuclear Fusion

    JF - Nuclear Fusion

    SN - 0029-5515

    IS - 6

    ER -