Theory of strongly reflective microwaves propagation in turbulent inhomogeneous plasmas is described. The amplitude of scattered signal is calculated as in the linear scattering regime within the Born approximation, as in the nonlinear regime of scattering. The possibility of analytical description of the nonlinear backscattering is considered. Based on the results of theoretical analysis of different scattering regimes of microwaves in turbulent inhomogeneous plasmas, widely used for analysis of turbulence, we discuss the main schemes of fluctuation reflectometry in thermonuclear toroidal devices. We give the description of different methods which allow interpreting the experimental data, collected with the use of fluctuation reflectometry, and improving the locality of measurments and the fluctuations wavevector resolution.
Keywords: scattering of microwaves, fluctuation reflectometry, drift turbulence, low frequency density fluctuations, toroidal devices, thermonuclear fusion PACS:52.35.Hr, 52.35.Mw, 52.70.−m (all) DOI:10.3367/UFNe.2020.08.038813 Citation: Gusakov E Z, Popov A Yu "Theory of strongly reflective microwaves in turbulent inhomogeneous plasmas and its application for description of fluctuation reflectometry in thermonuclear toroidal devices" Phys. Usp., accepted
Received: 25th, December 2019, revised: 5th, July 2020, accepted: 11th, August 2020