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Application of optical scanner to switching of x-ray photon helicities at kHz range

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3 Author(s)
Suzuki, Motohiro ; SPring-8/JASRI, 1-1-1 Kouto, Mikazuki, Sayo, Hyogo 679-5198, Japan ; Kawamura, N. ; Ishikawa, Tetsuya

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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. © 2003 American Institute of Physics.

Published in:

Review of Scientific Instruments  (Volume:74 ,  Issue: 1 )