Electron temperature profile from optically grey X3-mode of electron cyclotron emission at Wendelstein 7-X using Bayesian analysis

Abstract The third harmonic extraordinary (X3) mode of electron cyclotron emission is investigated, aiming at its diagnostic capability towards the measurement of electron temperature, T e , of plasmas with higher densities exceeding the second harmonic extraordinary (X2) mode cutoff. A Bayesian dat...

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Published inPlasma physics and controlled fusion Vol. 64; no. 5; pp. 55016 - 55028
Main Authors Chaudhary, Neha, Hirsch, Matthias, Hoefel, Udo, Oosterbeek, Johan W, Marushchenko, Nikolai B, Wolf, Robert C
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.05.2022
Subjects
Bayesian statistics
electron cyclotron emission
electron temperature
optically grey
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Summary:Abstract The third harmonic extraordinary (X3) mode of electron cyclotron emission is investigated, aiming at its diagnostic capability towards the measurement of electron temperature, T e , of plasmas with higher densities exceeding the second harmonic extraordinary (X2) mode cutoff. A Bayesian data-analysis approach is adopted through the forward modeling of the X3 emission observations to extract the underlying T e profile. Bayesian analysis shows that the high field side of the X3 emission spectrum is sufficient to provide the T e profile. Additionally, for plasma control purposes, a correction factor is provided to track continuous core T e from the measured radiation temperature of the optically grey X3 emission.
Bibliography:PPCF-103729.R2
ISSN:0741-3335
1361-6587
DOI:10.1088/1361-6587/ac5df3