Correlation reflectometry for turbulence and magnetic field measurements in fusion plasmas (invited)

For the interpretation of correlation reflectometry data a fast two-dimensional full wave code in which realistic plasma geometries are used has been developed. Results of this code are compared with experiments from which turbulence correlation lengths and fluctuation levels are extracted with statistical optics methods. It is shown that in general the measured reflectometer correlation length is not equal to the turbulence correlation length. The code is also used to study the possibility of O–X correlation reflectometry in FIRE for the determination of the local magnetic field strength. It was found that this is only possible at very low fluctuation levels.