A method for density fluctuation measurements using pulse reflectometry

An analytical 1D model based on the WKB approximation is used to study the properties of a short pulse reflectometry diagnostic in a magnetic fusion device. Expressions linking the pulse delay with the parameters of the turbulence near the cut-off layer are derived for both ordinary and extraordinar...

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Bibliographic Details
Published in:Nuclear fusion 2023-07, Vol.63 (7), p.76012
Main Authors: Krutkin, O., Brunner, S., Coda, S.
Format: Article
Language:English
Subjects:
full-wave modelling
reflectometry
turbulence
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Summary:An analytical 1D model based on the WKB approximation is used to study the properties of a short pulse reflectometry diagnostic in a magnetic fusion device. Expressions linking the pulse delay with the parameters of the turbulence near the cut-off layer are derived for both ordinary and extraordinary polarizations of the probing beam. These results are used to develop a method for measuring the turbulence amplitude and the radial correlation length. The analytical conclusions and the proposed method are validated using full-wave numerical modelling. The latter is also used to study the limitations of the method and potential experimental effects not included in the reduced model.
ISSN:0029-5515
1741-4326
DOI:10.1088/1741-4326/acd5e0