High-frequency polarimetric measurement of both electron density and poloidal magnetic field in Tokamaks

Two new methods are proposed for the simultaneous determination of the Cotton–Mouton and the Faraday effects in a magnetized plasma from direct measurements of phase only, which are preferable to amplitude measurements since they do not require detector calibrations and allow better signal-to-noise ratios. The present methods can achieve frequencies up to hundreds of kHz, much higher than with a previously proposed method. The choice between the two alternative methods is dictated by practical considerations and is briefly discussed.