A nonlinear theory of Doppler reflectometry is developed in the case of a high level of turbulent density perturbations, when the multiple forward scattering of the probing wave is dominant. It is shown that even in this regime the diagnostics is able to measure the plasma poloidal velocity with a spatial resolution that is, however, dependent on the plasma density profile and the turbulence distribution. The problem of diagnostics results interpretation is discussed.
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Gusakov et al. (2005) studied this question.
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