摘要
In this work,Doppler reflectometry(DR)and radial correlation DR(RCDR)nonlinear scattering effects are studied using full-wave modeling with a set of representative FT-2 tokamak turbulence as inputs.Narrowing of the RCDR correlation function and widening of the DR poloidal wavenumber spectrum are demonstrated.An effect on the dependence of the DR signal frequency shift on the probing wavenumber is found,namely,this dependence‘linearizing’in the nonlinear scattering regime.Nonlinear effects are shown to be weaker for O-mode probing than for X-mode probing,while a faster transition to nonlinear regime is demonstrated for RCDR compared to DR in both probing scenarios.
基金
Modeling of the O-mode DR signals was performed with the financial support of RFBR grant 18-32-00031
Modeling of the X-mode DR signals was performed with the financial support of the Russian Science Foundation grant 17-1201110
Measurements at the FT-2 tokamak were supported by the state contract of the Ioffe Institute
the work are supported by grants 316088 and 318314 of the Academy of Finland
partially carried out within the framework of the French Federation for Magnetic Fusion Studies(FR-FCM)
the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 and 2019-2020 under grant agreement No.633053。
