Forward modeling of collective Thomson scattering for Wendelstein 7-X plasmas: Electrostatic approximation

I. Abramovic*, A. Pavone, D. Moseev, N. J. Lopes Cardozo, M. Salewski, H. P. Laqua, M. Stejner, T. Stange, S. Marsen, S. K. Nielsen, T. Jensen, W. Kasparek, W7-X Team

*Corresponding author for this work

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Abstract

In this paper, we present a method for numerical computation of collective Thomson scattering (CTS). We developed a forward model, eCTS, in the electrostatic approximation and benchmarked it against a full electromagnetic model. Differences between the electrostatic and the electromagnetic models are discussed. The sensitivity of the results to the ion temperature and the plasma composition is demonstrated. We integrated the model into the Bayesian data analysis framework Minerva and used it for the analysis of noisy synthetic data sets produced by a full electromagnetic model. It is shown that eCTS can be used for the inference of the bulk ion temperature. The model has been used to infer the bulk ion temperature from the first CTS measurements on Wendelstein 7-X.

Original languageEnglish
Article number023501
JournalReview of Scientific Instruments
Volume90
Issue number2
Number of pages12
ISSN0034-6748
DOIs
Publication statusPublished - 2019

Cite this

Abramovic, I. ; Pavone, A. ; Moseev, D. ; Lopes Cardozo, N. J. ; Salewski, M. ; Laqua, H. P. ; Stejner, M. ; Stange, T. ; Marsen, S. ; Nielsen, S. K. ; Jensen, T. ; Kasparek, W. ; W7-X Team. / Forward modeling of collective Thomson scattering for Wendelstein 7-X plasmas: Electrostatic approximation. In: Review of Scientific Instruments. 2019 ; Vol. 90, No. 2.
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title = "Forward modeling of collective Thomson scattering for Wendelstein 7-X plasmas: Electrostatic approximation",
abstract = "In this paper, we present a method for numerical computation of collective Thomson scattering (CTS). We developed a forward model, eCTS, in the electrostatic approximation and benchmarked it against a full electromagnetic model. Differences between the electrostatic and the electromagnetic models are discussed. The sensitivity of the results to the ion temperature and the plasma composition is demonstrated. We integrated the model into the Bayesian data analysis framework Minerva and used it for the analysis of noisy synthetic data sets produced by a full electromagnetic model. It is shown that eCTS can be used for the inference of the bulk ion temperature. The model has been used to infer the bulk ion temperature from the first CTS measurements on Wendelstein 7-X.",
author = "I. Abramovic and A. Pavone and D. Moseev and {Lopes Cardozo}, {N. J.} and M. Salewski and Laqua, {H. P.} and M. Stejner and T. Stange and S. Marsen and Nielsen, {S. K.} and T. Jensen and W. Kasparek and {W7-X Team}",
year = "2019",
doi = "10.1063/1.5048361",
language = "English",
volume = "90",
journal = "Review of Scientific Instruments",
issn = "0034-6748",
publisher = "American Institute of Physics",
number = "2",

}

Abramovic, I, Pavone, A, Moseev, D, Lopes Cardozo, NJ, Salewski, M, Laqua, HP, Stejner, M, Stange, T, Marsen, S, Nielsen, SK, Jensen, T, Kasparek, W & W7-X Team 2019, 'Forward modeling of collective Thomson scattering for Wendelstein 7-X plasmas: Electrostatic approximation', Review of Scientific Instruments, vol. 90, no. 2, 023501. https://doi.org/10.1063/1.5048361

Forward modeling of collective Thomson scattering for Wendelstein 7-X plasmas: Electrostatic approximation. / Abramovic, I.; Pavone, A.; Moseev, D.; Lopes Cardozo, N. J.; Salewski, M.; Laqua, H. P.; Stejner, M.; Stange, T.; Marsen, S.; Nielsen, S. K.; Jensen, T.; Kasparek, W.; W7-X Team.

In: Review of Scientific Instruments, Vol. 90, No. 2, 023501, 2019.

Research output: Contribution to journalJournal articleResearchpeer-review

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T1 - Forward modeling of collective Thomson scattering for Wendelstein 7-X plasmas: Electrostatic approximation

AU - Abramovic, I.

AU - Pavone, A.

AU - Moseev, D.

AU - Lopes Cardozo, N. J.

AU - Salewski, M.

AU - Laqua, H. P.

AU - Stejner, M.

AU - Stange, T.

AU - Marsen, S.

AU - Nielsen, S. K.

AU - Jensen, T.

AU - Kasparek, W.

AU - W7-X Team

PY - 2019

Y1 - 2019

N2 - In this paper, we present a method for numerical computation of collective Thomson scattering (CTS). We developed a forward model, eCTS, in the electrostatic approximation and benchmarked it against a full electromagnetic model. Differences between the electrostatic and the electromagnetic models are discussed. The sensitivity of the results to the ion temperature and the plasma composition is demonstrated. We integrated the model into the Bayesian data analysis framework Minerva and used it for the analysis of noisy synthetic data sets produced by a full electromagnetic model. It is shown that eCTS can be used for the inference of the bulk ion temperature. The model has been used to infer the bulk ion temperature from the first CTS measurements on Wendelstein 7-X.

AB - In this paper, we present a method for numerical computation of collective Thomson scattering (CTS). We developed a forward model, eCTS, in the electrostatic approximation and benchmarked it against a full electromagnetic model. Differences between the electrostatic and the electromagnetic models are discussed. The sensitivity of the results to the ion temperature and the plasma composition is demonstrated. We integrated the model into the Bayesian data analysis framework Minerva and used it for the analysis of noisy synthetic data sets produced by a full electromagnetic model. It is shown that eCTS can be used for the inference of the bulk ion temperature. The model has been used to infer the bulk ion temperature from the first CTS measurements on Wendelstein 7-X.

U2 - 10.1063/1.5048361

DO - 10.1063/1.5048361

M3 - Journal article

VL - 90

JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

SN - 0034-6748

IS - 2

M1 - 023501

ER -