Author/Authors :
Zhuravlev، نويسنده , , V and Sanchez، نويسنده , , J and de la Luna، نويسنده , , E and Hirsch، نويسنده , , M and Estrada، نويسنده , , T and Braٌas، نويسنده , , B and Frances، نويسنده , , M and Geist، نويسنده , , T and Hartfuss، نويسنده , , H.J and Hanson، نويسنده , , G.R and Wilgen، نويسنده , , J.B and Kaita، نويسنده , , R، نويسنده ,
Abstract :
Amplitude modulation (AM) reflectometry is a technique for density profile measurements in magnetic fusion plasmas based on the measurement of the phase delay of the modulation in the amplitude of a microwave beam launched and reflected at the plasma. Results from AM experiments in the PBX-M tokamak and the W7-AS stellarator are presented. A general analysis of the capabilities of the technique is performed, particularly centered in the effects of spatial turbulence. Simulations of the effects of two-dimensional turbulence have been performed for medium size (W7-AS) and large devices (LHD stellarator, ITER), showing the capability of the AM technique to operate in turbulent plasmas. Finally, possible solutions to the problem of parasitic reflections in AM systems are presented as development options.
