1. EX/10-TH/8 Transport BENCHMARKING OF FULL-F GLOBAL GYROKINETIC MODELING RESULTS AGAINST THE FT-2 TOKAMAK DOPPLER REFLECTOMETRY DATA USING SYNTHETIC DIAGNOSTICS
A.B. Altukhov1, A.D. Gurchenko1, E.Z. Gusakov1, M.A. Irzak1, O.L. Krutkin1, P. Niskala2,
L.A. Esipov1 , S. Heraux3, T.P. Kiviniemi2, S. Leerink2, C. Lechte4 1
St Petersburg,
Russia
Aalto University,Espoo,
Finland 2 3 4
Comparison of DR spectra for up-shifted antenna vertical displacement.
Dependence of the DR signal frequency shift on the antenna vertical displacement ya.
The RCDR CCF against the channel frequency separation
A good agreement between the DR spectra measured and computed using both fast linear and slow full-wave DR synthetic diagnostics. Not only frequency shift and width, but the spectra shape similar.
The DR experiment geometry and the probing wave poloidal electric field distribution
?:However a drastic (factor of 4!) excess was found in the decay with growing frequency shift in the probing wave channels of the RCDR cross-correlation function (CCF) provided by the fast synthetic diagnostics compared to the experimental one.
!: Quite a small (p /4) phase modulation produced such a strong impact on the RCDR performance in experiment. The CCF calculated by full-wave DR synthetic diagnostics accounting for nonlinear effects in probing wave propagation is close to the experimental one.