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research article

A method for density fluctuation measurements using pulse reflectometry

Krutkin, Oleg  
•
Brunner, Stephan  
•
Coda, Stefano  
July 1, 2023
Nuclear Fusion

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.

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Type
research article
DOI
10.1088/1741-4326/acd5e0
Web of Science ID

WOS:000993111500001

Author(s)
Krutkin, Oleg  
Brunner, Stephan  
Coda, Stefano  
Date Issued

2023-07-01

Publisher

IOP Publishing Ltd

Published in
Nuclear Fusion
Volume

63

Issue

7

Article Number

076012

Subjects

reflectometry

•

turbulence

•

full-wave modelling

•

microwave reflectometry

•

nonlinear-theory

•

length

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SPC  
Available on Infoscience
May 9, 2023
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/197584
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