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Influence of the probing wave phase modulation on the X-mode radial correlation Doppler reflectometry performance in the FT-2 tokamak
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Physics of Plasmas, Volume 25, issue 11, pp. 1-8
Abstract
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.
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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 2018, 'Influence of the probing wave phase modulation on the X-mode radial correlation Doppler reflectometry performance in the FT-2 tokamak', Physics of Plasmas, vol. 25, no. 11, 112503, pp. 1-8. https://doi.org/10.1063/1.5051815