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

Wendelstein 7-X Team, N.J. Lopes Cardozo

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3 Citations (Scopus)

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
Number of pages12
JournalReview of Scientific Instruments
Volume90
Issue number2
DOIs
Publication statusPublished - 1 Feb 2019

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