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A new method for fast helicity switching of x-ray circular polarization in the kHz range is described. An optical scanner was used to sinusoidally oscillate a diamond crystal, functioning as an x-ray quarterwave-phase plate, with a 55.5″ angular amplitude around the Bragg condition up to 3 kHz. The oscillation accuracy and stability with respect to frequency variations were evaluated in situ to be better than ±1.5″, within the angular acceptance of the phase plate. All of the Stokes components of the produced circular polarization were determined as the helicities were switching at an x-ray energy of 8388 eV. A degree of circular polarization of greater than 97% was obtained for both helicities up to 2 kHz. Absolute values of the S3/S0 between right- and left-circular polarizations agreed within the experimental errors.
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Suzuki et al. (2003) studied this question.
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