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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Abstract 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.
AbstractList 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.
Author Hirsch, Matthias
Wolf, Robert C
Hoefel, Udo
Chaudhary, Neha
Oosterbeek, Johan W
Marushchenko, Nikolai B
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Snippet Abstract The third harmonic extraordinary (X3) mode of electron cyclotron emission is investigated, aiming at its diagnostic capability towards the measurement...
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SubjectTerms Bayesian statistics
electron cyclotron emission
electron temperature
optically grey
Title Electron temperature profile from optically grey X3-mode of electron cyclotron emission at Wendelstein 7-X using Bayesian analysis
URI https://iopscience.iop.org/article/10.1088/1361-6587/ac5df3
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