Enhanced Doppler Effect in the Upper Hybrid Resonance Microwave Backscattering Experiment

Details Enhanced Doppler Effect in the Upper Hybrid Resonance Microwave Backscattering Experiment Enhanced Doppler Effect in the Upper Hybrid Resonance Microwave Backscattering Experiment

2004-10-13

arxiv.org/abs/physics/0410081v1

Physics

Plasma Physics

Scientific paper

Observations of enhanced Doppler frequency shift effect of the highly localized microwave backscattering in the upper hybrid resonance are reported. The experiment is performed at FT-2 tokamak, where a steerable focusing antenna set, allowing off equatorial plane plasma extraordinary wave probing from high magnetic field side, was installed. A separate line less than 1.5 MHz wide and shifted by up to 2 MHz is routinely observed in the backscattering spectrum under condition of accessible upper hybrid resonance. The enhanced frequency shift is explained by the growth of poloidal wave number of the probing wave in the resonance. The new scheme for local diagnostics of fluctuations poloidal rotation based on this effect is proposed.

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