7th International Reflectometry Workshop for Fusion Plasma Diagnostics, 9-12 de Maio de 2005, Garching, Alemanha

	Nonlinear Effects in the Doppler Reflectometry (Analytical Theory and Numerical Simulations)
	E.Z. Gusakov, S. Heuraux, F. da Silva e A.V. Surkov
	Resumo
	One of widespread methods used at present for plasma poloidal velocity measurements is Doppler reflectometry [1–5]. This technique provides measuring fluctuations propagation poloidal velocity which is often shown to be dominated by plasma poloidal rotation velocity [3, 4]. This method is based on plasma probing with a microwave beam which is tilted with respect to the plasma density gradient. A back-scattered signal with frequency differing from the probing one is registered by a nearby standing or the same antenna. The information on the plasma poloidal rotation is obtained in this technique from the frequency shift of the backscattering spectrum which is supposed to originate from the Doppler effect due to the fluctuation rotation.