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

W7-X Team

doi:10.1063/1.5048361

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

W7-X Team

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

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 language	English
Article number	023501
Journal	Review of Scientific Instruments
Volume	90
Issue number	2
DOIs	https://doi.org/10.1063/1.5048361
State	Published - Feb 1 2019

Funding

This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 under Grant Agreement No. 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission.

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10.1063/1.5048361

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@article{123e2fd1ec78430397c437f0a8ace8cc,

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 = "\{W7-X Team\} and 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 Wolf, \{R. C.\} and A. Ali and A. Alonso and J. Baldzuhn and C. Beidler and M. Beurskens and C. Biedermann and Bosch, \{H. S.\} and S. Bozhenkov and R. Brakel and A. Dinklage and Y. Feng and G. Fuchert and J. Geiger and O. Grulke and P. Helander and M. Hirsch and U. H{\"o}fel and M. Jakubowski and J. Knauer and G. Kocsis and R. K{\"o}nig and P. Kornejew and A. Kr{\"a}mer-Flecken and M. Krychowiak and M. Landreman and A. Langenberg and S. Lazerson and H. Maa{\ss}berg and M. Marushchenko and H. Niemann and N. Pablant and E. Pasch and M. Cianciosa and Harris, \{J. H.\} and J. Lore and A. Lumsdaine and Spong, \{D. A.\}",

note = "Publisher Copyright: {\textcopyright} 2019 Author(s).",

year = "2019",

month = feb,

day = "1",

doi = "10.1063/1.5048361",

language = "English",

volume = "90",

journal = "Review of Scientific Instruments",

issn = "0034-6748",

publisher = "American Institute of Physics",

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

T2 - Electrostatic approximation

AU - W7-X Team

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 - Wolf, R. C.

AU - Ali, A.

AU - Alonso, A.

AU - Baldzuhn, J.

AU - Beidler, C.

AU - Beurskens, M.

AU - Biedermann, C.

AU - Bosch, H. S.

AU - Bozhenkov, S.

AU - Brakel, R.

AU - Dinklage, A.

AU - Feng, Y.

AU - Fuchert, G.

AU - Geiger, J.

AU - Grulke, O.

AU - Helander, P.

AU - Hirsch, M.

AU - Höfel, U.

AU - Jakubowski, M.

AU - Knauer, J.

AU - Kocsis, G.

AU - König, R.

AU - Kornejew, P.

AU - Krämer-Flecken, A.

AU - Krychowiak, M.

AU - Landreman, M.

AU - Langenberg, A.

AU - Lazerson, S.

AU - Maaßberg, H.

AU - Marushchenko, M.

AU - Niemann, H.

AU - Pablant, N.

AU - Pasch, E.

AU - Cianciosa, M.

AU - Harris, J. H.

AU - Lore, J.

AU - Lumsdaine, A.

AU - Spong, D. A.

PY - 2019/2/1

Y1 - 2019/2/1

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.

UR - https://www.scopus.com/pages/publications/85061342826

U2 - 10.1063/1.5048361

DO - 10.1063/1.5048361

M3 - Article

C2 - 30831775

AN - SCOPUS:85061342826

SN - 0034-6748

VL - 90

JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

IS - 2

M1 - 023501

ER -

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

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