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Imazono, Takashi; Hirono, Toko*; Kimura, Hiroaki*; Saito, Yuji; Ishino, Masahiko; Muramatsu, Yasuji*; Koike, Masato; Sano, Kazuo*
Review of Scientific Instruments, 76(12), p.126106_1 - 126106_4, 2005/12
Times Cited Count：14 Percentile：54.93(Instruments & Instrumentation)Polarizance of a reflection-type polarizer made with a synthetic mica (fluorophlogopite) single crystal was evaluated at the photon energy of 880 eV by means of the rotating-analyzer method in conjunction with the evaluation of the degree of linear polarization of the insertion beamline, SPring-8 BL23SU, featuring an APPLE-2 type variably polarizing undulator. When the undulator was tuned to the horizontal linear polarization mode, the maximum reflectances for s- and p-polarization for a symmetric Bragg reflection of synthetic mica(002) were 2.6% and 0.013%, respectively, at incident angles of near 45
. Our analysis based on the rotating-analyzer method gave the polarizance of the polarizer of at least 0.997 
0.002 and the degree of linear polarization of 0.993 0.004 in the linear polarization mode.
Imazono, Takashi; Ishino, Masahiko; Koike, Masato; Kimura, Hiroaki*; Hirono, Toko*; Sano, Kazuo*
Review of Scientific Instruments, 76(2), p.023104_1 - 023104_4, 2005/02
Times Cited Count：13 Percentile：53.03(Instruments & Instrumentation)To develop the polarizer functioning in the soft X-ray region of 1 keV, the polarization performance of muscovite mica has been investigated theoretically with simulation code based on dynamical theory. As the result of calculation, muscovite mica is found to be promising candidate as a reflection-type polarizer with the reflectivity for s-polarization of 0.03 at approximately 0.9 keV at the angle of incidence of 45. In order to verify the polarization performance of muscovite mica experimentally, a symmetric Bragg reflection measurement of muscovite mica(002) was carried out using a linearly polarized undulator radiation. As the result, the maximum reflectivity for s-polarization and the extinction ratio of muscovite mica were approximately 0.018 and 200 at 878 eV, respectively. This result indicates that muscovite mica works as a practical polarizer in the soft X-ray region.
