EFFECT OF PLASMA-DENSITY FLUCTUATIONS ON PULSED REFLECTOMETRY

The structure and specific features of output signals of a pulsed rada r-reflectometer in experiments with tokamak plasma are discussed. A pr ocedure that takes the effect of density fluctuations into account is proposed for analysis of the experimental data obtained by pulsed refl ectometry. A comparison is made of the results obtained with this proc edure in the T-11M tokamak operating in the ohmic regime with the resu lts of numerical and theoretical studies of the interaction between mi crowave pulses and plasma density fluctuations. It is shown that a cor rection to the position of the reflecting plasma layers (which is to b e introduced to compensate an error resulting from averaging reflectom etry data) agrees fairly well with that obtained in calculations with the one-dimensional model for the steady-state stage of the discharge. This correction is determined by the dispersion of the experimental d ata. The proposed method is applied to the averaged reflectometry data .