Measurements of plasma composition in the TEXTOR tokamak by collective Thomson scattering

Morten Stejner Pedersen, Søren Bang Korsholm, Stefan Kragh Nielsen, Mirko Salewski, Henrik Bindslev, S. Brezinsek, Vedran Furtula, Frank Leipold, Poul Michelsen, Fernando Meo, Dmitry Moseev, A. Bürger, M. Kantor, M. de Baar

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    We demonstrate the use of collective Thomson scattering (CTS) for spatially localized measurements of the isotopic composition of magnetically confined fusion plasmas. The experiments were conducted in the TEXTOR tokamak by scattering millimeter-wave probe radiation off plasma fluctuations with wave vector components nearly perpendicular to the magnetic field. Under such conditions the sensitivity of the CTS spectrum to plasma composition is enhanced by the spectral signatures of the ion cyclotron motion and of weakly damped ion Bernstein waves. Recent experiments on TEXTOR demonstrated the ability to resolve these signatures in the CTS spectrum as well as their sensitivity to the ion species mix in the plasma. This paper shows that the plasma composition can be inferred from the measurements through forward modeling of the CTS spectrum. We demonstrate that spectra measured in plasmas consisting of hydrogen, deuterium and 3He can be accurately reproduced by theory and yield inferred plasma compositions consistent with expectations. The potential to use CTS for measurements of plasma composition is of significant interest since CTS is well suited for reactor environments and since there is at present no established method to measure the fuel ion density ratio in the core of a burning fusion plasma.
    Original languageEnglish
    JournalPlasma Physics and Controlled Fusion
    Volume54
    Pages (from-to)015008
    ISSN0741-3335
    DOIs
    Publication statusPublished - 2012

    Cite this

    Stejner Pedersen, Morten ; Korsholm, Søren Bang ; Nielsen, Stefan Kragh ; Salewski, Mirko ; Bindslev, Henrik ; Brezinsek, S. ; Furtula, Vedran ; Leipold, Frank ; Michelsen, Poul ; Meo, Fernando ; Moseev, Dmitry ; Bürger, A. ; Kantor, M. ; de Baar, M. / Measurements of plasma composition in the TEXTOR tokamak by collective Thomson scattering. In: Plasma Physics and Controlled Fusion. 2012 ; Vol. 54. pp. 015008.
    @article{4bf5787df3bf4b05b97591dcb5ad44b6,
    title = "Measurements of plasma composition in the TEXTOR tokamak by collective Thomson scattering",
    abstract = "We demonstrate the use of collective Thomson scattering (CTS) for spatially localized measurements of the isotopic composition of magnetically confined fusion plasmas. The experiments were conducted in the TEXTOR tokamak by scattering millimeter-wave probe radiation off plasma fluctuations with wave vector components nearly perpendicular to the magnetic field. Under such conditions the sensitivity of the CTS spectrum to plasma composition is enhanced by the spectral signatures of the ion cyclotron motion and of weakly damped ion Bernstein waves. Recent experiments on TEXTOR demonstrated the ability to resolve these signatures in the CTS spectrum as well as their sensitivity to the ion species mix in the plasma. This paper shows that the plasma composition can be inferred from the measurements through forward modeling of the CTS spectrum. We demonstrate that spectra measured in plasmas consisting of hydrogen, deuterium and 3He can be accurately reproduced by theory and yield inferred plasma compositions consistent with expectations. The potential to use CTS for measurements of plasma composition is of significant interest since CTS is well suited for reactor environments and since there is at present no established method to measure the fuel ion density ratio in the core of a burning fusion plasma.",
    author = "{Stejner Pedersen}, Morten and Korsholm, {S{\o}ren Bang} and Nielsen, {Stefan Kragh} and Mirko Salewski and Henrik Bindslev and S. Brezinsek and Vedran Furtula and Frank Leipold and Poul Michelsen and Fernando Meo and Dmitry Moseev and A. B{\"u}rger and M. Kantor and {de Baar}, M.",
    year = "2012",
    doi = "10.1088/0741-3335/54/1/015008",
    language = "English",
    volume = "54",
    pages = "015008",
    journal = "Plasma Physics and Controlled Fusion",
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    Stejner Pedersen, M, Korsholm, SB, Nielsen, SK, Salewski, M, Bindslev, H, Brezinsek, S, Furtula, V, Leipold, F, Michelsen, P, Meo, F, Moseev, D, Bürger, A, Kantor, M & de Baar, M 2012, 'Measurements of plasma composition in the TEXTOR tokamak by collective Thomson scattering', Plasma Physics and Controlled Fusion, vol. 54, pp. 015008. https://doi.org/10.1088/0741-3335/54/1/015008

    Measurements of plasma composition in the TEXTOR tokamak by collective Thomson scattering. / Stejner Pedersen, Morten; Korsholm, Søren Bang; Nielsen, Stefan Kragh; Salewski, Mirko; Bindslev, Henrik; Brezinsek, S.; Furtula, Vedran; Leipold, Frank; Michelsen, Poul; Meo, Fernando; Moseev, Dmitry; Bürger, A.; Kantor, M.; de Baar, M.

    In: Plasma Physics and Controlled Fusion, Vol. 54, 2012, p. 015008.

    Research output: Contribution to journalJournal articleResearchpeer-review

    TY - JOUR

    T1 - Measurements of plasma composition in the TEXTOR tokamak by collective Thomson scattering

    AU - Stejner Pedersen, Morten

    AU - Korsholm, Søren Bang

    AU - Nielsen, Stefan Kragh

    AU - Salewski, Mirko

    AU - Bindslev, Henrik

    AU - Brezinsek, S.

    AU - Furtula, Vedran

    AU - Leipold, Frank

    AU - Michelsen, Poul

    AU - Meo, Fernando

    AU - Moseev, Dmitry

    AU - Bürger, A.

    AU - Kantor, M.

    AU - de Baar, M.

    PY - 2012

    Y1 - 2012

    N2 - We demonstrate the use of collective Thomson scattering (CTS) for spatially localized measurements of the isotopic composition of magnetically confined fusion plasmas. The experiments were conducted in the TEXTOR tokamak by scattering millimeter-wave probe radiation off plasma fluctuations with wave vector components nearly perpendicular to the magnetic field. Under such conditions the sensitivity of the CTS spectrum to plasma composition is enhanced by the spectral signatures of the ion cyclotron motion and of weakly damped ion Bernstein waves. Recent experiments on TEXTOR demonstrated the ability to resolve these signatures in the CTS spectrum as well as their sensitivity to the ion species mix in the plasma. This paper shows that the plasma composition can be inferred from the measurements through forward modeling of the CTS spectrum. We demonstrate that spectra measured in plasmas consisting of hydrogen, deuterium and 3He can be accurately reproduced by theory and yield inferred plasma compositions consistent with expectations. The potential to use CTS for measurements of plasma composition is of significant interest since CTS is well suited for reactor environments and since there is at present no established method to measure the fuel ion density ratio in the core of a burning fusion plasma.

    AB - We demonstrate the use of collective Thomson scattering (CTS) for spatially localized measurements of the isotopic composition of magnetically confined fusion plasmas. The experiments were conducted in the TEXTOR tokamak by scattering millimeter-wave probe radiation off plasma fluctuations with wave vector components nearly perpendicular to the magnetic field. Under such conditions the sensitivity of the CTS spectrum to plasma composition is enhanced by the spectral signatures of the ion cyclotron motion and of weakly damped ion Bernstein waves. Recent experiments on TEXTOR demonstrated the ability to resolve these signatures in the CTS spectrum as well as their sensitivity to the ion species mix in the plasma. This paper shows that the plasma composition can be inferred from the measurements through forward modeling of the CTS spectrum. We demonstrate that spectra measured in plasmas consisting of hydrogen, deuterium and 3He can be accurately reproduced by theory and yield inferred plasma compositions consistent with expectations. The potential to use CTS for measurements of plasma composition is of significant interest since CTS is well suited for reactor environments and since there is at present no established method to measure the fuel ion density ratio in the core of a burning fusion plasma.

    U2 - 10.1088/0741-3335/54/1/015008

    DO - 10.1088/0741-3335/54/1/015008

    M3 - Journal article

    VL - 54

    SP - 015008

    JO - Plasma Physics and Controlled Fusion

    JF - Plasma Physics and Controlled Fusion

    SN - 0741-3335

    ER -