Influence of the probing wave phase modulation on the X-mode radial correlation Doppler reflectometry performance in the FT-2 tokamak

The cross-correlation function of high field side radial correlation X-mode Doppler reflectometry (DR) measured in the FT-2 tokamak experiment is shown to be a factor of three narrower than that computed using the fast linear (Born approximation) version of the X-mode DR synthetic diagnostics develo...

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Bibliographic Details
Published in:Physics of plasmas 2018-11, Vol.25 (11)
Main Authors: Altukhov, A. B., Gurchenko, A. D., Gusakov, E. Z., Irzak, M. A., Niskala, P., Esipov, L. A., Kiviniemi, T. P., Krutkin, O. L., Leerink, S.
Format: Article
Language:English
Subjects:
Backscattering
Born approximation
Computation
Correlation analysis
Phase modulation
Plasma physics
Reflectometry
Tokamak devices
Variation
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Summary:The cross-correlation function of high field side radial correlation X-mode Doppler reflectometry (DR) measured in the FT-2 tokamak experiment is shown to be a factor of three narrower than that computed using the fast linear (Born approximation) version of the X-mode DR synthetic diagnostics developed in the framework of the ELMFIRE global gyrokinetic modeling of the FT-2 ohmic discharge. This difference is observed in spite of the fact that the computed DR signal frequency spectra are shown to be similar to those measured. A modest phase modulation of the probing and backscattering waves by the long-scale turbulent density fluctuations is shown, both experimentally and in computation, to be responsible for the observed effect.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.5051815