A forward model for the helium plume effect and the interpretation of helium charge exchange measurements at ASDEX Upgrade

A. Kappatou, R.M. McDermott, T. Pütterich, R. Dux, B. Geiger, R.J.E. Jaspers, A.J.H. Donné, E. Viezzer, M. Cavedon

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3 Citaties (Scopus)

Uittreksel

The analysis of the charge exchange measurements of helium is hindered by an additional emission contributing to the spectra, the helium 'plume' emission (Fonck et al 1984 Phys. Rev. A 29 3288), which complicates the interpretation of the measurements. The plume emission is indistinguishable from the active charge exchange signal when standard analysis of the spectra is applied and its intensity is of comparable magnitude for ASDEX Upgrade conditions, leading to a significant overestimation of the He2+ densities if not properly treated. Furthermore, the spectral line shape of the plume emission is non-Gaussian and leads to wrong ion temperature and flow measurements when not taken into account. A kinetic model for the helium plume emission has been developed for ASDEX Upgrade. The model is benchmarked against experimental measurements and is shown to capture the underlying physics mechanisms of the plume effect, as it can reproduce the experimental spectra and provides consistent values for the ion temperature, plasma rotation, and He2+ density.

TaalEngels
Artikelnummer055006
Aantal pagina's13
TijdschriftPlasma Physics and Controlled Fusion
Volume60
Nummer van het tijdschrift5
DOI's
StatusGepubliceerd - 23 mrt 2018

Vingerafdruk

charge exchange
plumes
Helium
helium
ion temperature
Ions
Flow measurement
Temperature measurement
Physics
flow measurement
Plasmas
Kinetics
line spectra
line shape
temperature measurement
physics
kinetics
Temperature

Trefwoorden

    Citeer dit

    Kappatou, A. ; McDermott, R.M. ; Pütterich, T. ; Dux, R. ; Geiger, B. ; Jaspers, R.J.E. ; Donné, A.J.H. ; Viezzer, E. ; Cavedon, M./ A forward model for the helium plume effect and the interpretation of helium charge exchange measurements at ASDEX Upgrade. In: Plasma Physics and Controlled Fusion. 2018 ; Vol. 60, Nr. 5.
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    title = "A forward model for the helium plume effect and the interpretation of helium charge exchange measurements at ASDEX Upgrade",
    abstract = "The analysis of the charge exchange measurements of helium is hindered by an additional emission contributing to the spectra, the helium 'plume' emission (Fonck et al 1984 Phys. Rev. A 29 3288), which complicates the interpretation of the measurements. The plume emission is indistinguishable from the active charge exchange signal when standard analysis of the spectra is applied and its intensity is of comparable magnitude for ASDEX Upgrade conditions, leading to a significant overestimation of the He2+ densities if not properly treated. Furthermore, the spectral line shape of the plume emission is non-Gaussian and leads to wrong ion temperature and flow measurements when not taken into account. A kinetic model for the helium plume emission has been developed for ASDEX Upgrade. The model is benchmarked against experimental measurements and is shown to capture the underlying physics mechanisms of the plume effect, as it can reproduce the experimental spectra and provides consistent values for the ion temperature, plasma rotation, and He2+ density.",
    keywords = "ASDEX Upgrade, charge exchange recombination spectroscopy, helium density, helium plume emission",
    author = "A. Kappatou and R.M. McDermott and T. P{\"u}tterich and R. Dux and B. Geiger and R.J.E. Jaspers and A.J.H. Donn{\'e} and E. Viezzer and M. Cavedon",
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    A forward model for the helium plume effect and the interpretation of helium charge exchange measurements at ASDEX Upgrade. / Kappatou, A.; McDermott, R.M.; Pütterich, T.; Dux, R.; Geiger, B.; Jaspers, R.J.E.; Donné, A.J.H.; Viezzer, E.; Cavedon, M.

    In: Plasma Physics and Controlled Fusion, Vol. 60, Nr. 5, 055006, 23.03.2018.

    Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

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    T1 - A forward model for the helium plume effect and the interpretation of helium charge exchange measurements at ASDEX Upgrade

    AU - Kappatou,A.

    AU - McDermott,R.M.

    AU - Pütterich,T.

    AU - Dux,R.

    AU - Geiger,B.

    AU - Jaspers,R.J.E.

    AU - Donné,A.J.H.

    AU - Viezzer,E.

    AU - Cavedon,M.

    PY - 2018/3/23

    Y1 - 2018/3/23

    N2 - The analysis of the charge exchange measurements of helium is hindered by an additional emission contributing to the spectra, the helium 'plume' emission (Fonck et al 1984 Phys. Rev. A 29 3288), which complicates the interpretation of the measurements. The plume emission is indistinguishable from the active charge exchange signal when standard analysis of the spectra is applied and its intensity is of comparable magnitude for ASDEX Upgrade conditions, leading to a significant overestimation of the He2+ densities if not properly treated. Furthermore, the spectral line shape of the plume emission is non-Gaussian and leads to wrong ion temperature and flow measurements when not taken into account. A kinetic model for the helium plume emission has been developed for ASDEX Upgrade. The model is benchmarked against experimental measurements and is shown to capture the underlying physics mechanisms of the plume effect, as it can reproduce the experimental spectra and provides consistent values for the ion temperature, plasma rotation, and He2+ density.

    AB - The analysis of the charge exchange measurements of helium is hindered by an additional emission contributing to the spectra, the helium 'plume' emission (Fonck et al 1984 Phys. Rev. A 29 3288), which complicates the interpretation of the measurements. The plume emission is indistinguishable from the active charge exchange signal when standard analysis of the spectra is applied and its intensity is of comparable magnitude for ASDEX Upgrade conditions, leading to a significant overestimation of the He2+ densities if not properly treated. Furthermore, the spectral line shape of the plume emission is non-Gaussian and leads to wrong ion temperature and flow measurements when not taken into account. A kinetic model for the helium plume emission has been developed for ASDEX Upgrade. The model is benchmarked against experimental measurements and is shown to capture the underlying physics mechanisms of the plume effect, as it can reproduce the experimental spectra and provides consistent values for the ion temperature, plasma rotation, and He2+ density.

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    KW - charge exchange recombination spectroscopy

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    KW - helium plume emission

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