title: Polarization-dependent six-beam X-ray pinhole topographs.
abstract: X-ray six-beam pinhole topograph images were obtained for a silicon crystal with incident synchrotron X-rays. The polarization state of X-rays incident on the sample crystal was controlled by using a four-quadrant phase-retarder system [Okitsu et al. (2002). Acta Cryst. A58, 146-154] that can be rotated around the transmitted beam axis to generate arbitrarily polarized X-rays. Quantitative agreement was found between the experimental and computer-simulated topograph images based on the n-beam Takagi-Taupin dynamical theory under the assumption that the polarization state of the incident X-rays was identical with the experiment. This result confirmed the validity of the computer algorithm to solve the n-beam dynamical theory and the proper operation of the rotating four-quadrant phase-retarder system simultaneously.
authors.affiliation: Nano-Engineering Research Center, Institute of Engineering Innovation, Graduate School of Engineering, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan. okitsu@soyak.t.u-tokyo.ac.jp
authors.forename: Kouhei
authors.initials: K
authors.lastname: Okitsu
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Yoda
authors.forename: Yasuhiko
authors.initials: Y
authors.lastname: Imai
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Ueji
authors.forename: Yuta
authors.initials: Y
authors.lastname: Urano
authors.forename: XiaoWei
authors.initials: X
authors.lastname: Zhang