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

Authors :
P. Niskala
A. D. Gurchenko
E. Z. Gusakov
M. A. Irzak
Timo Kiviniemi
L. A. Esipov
A. B. Altukhov
Susan Leerink
Ioffe Institute
Fusion and Plasma Physics
Department of Applied Physics
Aalto-yliopisto
Aalto University
Source :
PHYSICS OF PLASMAS. 25(8):1-9
Publication Year :
2018

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.

Details

Language :
English
ISSN :
1070664X
Volume :
25
Issue :
8
Database :
OpenAIRE
Journal :
PHYSICS OF PLASMAS
Accession number :
edsair.doi.dedup.....bbf6785a442c6b26f8431cfd098d088a
Full Text :
https://doi.org/10.1063/1.5034781