Fast synthetic X-mode Doppler reflectometry diagnostics for the full-f global gyrokinetic modeling of the FT-2 tokamak

A. B. Altukhov, A. D. Gurchenko, E. Z. Gusakov, M. A. Irzak, P. Niskala, L. A. Esipov, T. P. Kiviniemi, S. Leerink

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

The fast linear (Born approximation) version of the X-mode Doppler reflectometry (DR) synthetic diagnostics is developed in the framework of the ELMFIRE global gyrokinetic modeling of the FT-2 tokamak ohmic discharge. The DR signal frequency spectra and the dependence of their frequency shift and shape on the probing antenna position are computed and shown to be similar to those measured in the high magnetic field side probing DR experiment at the FT-2 tokamak. The fluctuation poloidal velocities are determined using the DR experiment and synthetic diagnostics and shown to be within 15%. However, the computed and measured dependences of the DR signal power on the antenna position appear to be different presumably due to underestimation of the small-scale trapped electron mode turbulence component in the measurement region by the code.

Original languageEnglish
Article number082305
Pages (from-to)1-9
JournalPhysics of Plasmas
Volume25
Issue number8
DOIs
Publication statusPublished - 1 Aug 2018
MoE publication typeA1 Journal article-refereed

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