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11 March 2003 X-ray characterization of capillary system
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X-ray characterization measurements of capillary (X-ray Optical Systems Inc) were carried out at ISAS (Japan) X-ray beam facility. Since capillary system has a capability of collecting x-rays effectively by the small angle reflections in the narrow tubes, it is expected to apply it for the observation of astronomical x-ray objects. The depth of focus on the on-axis is 6 mm, and the image size at the focal plane is 0.4 mm (FWHM) with Cu-K. By using continuum x-ray (2 to 15 keV) beam, the on-axis efficiency was evaluated to be 20 %. The efficiency decreases gradually toward low energy range, this could be explained by the absorption effect of Si which is one of the constituent element of capillary tubes. The field of view is defined as the off-axis angle at which the efficiency becomes half of the on-axis value. The diameter of the field of view was 22', 19' at 4.51 keV and 8.04 keV, respectively. Capillary has no imaging capability, in other words, the light-concentrating direction is independent from the incident angle of x-ray beam. When the x-ray incident angle varies from -15' to +15', the focused images are distributed within 3'. From our measurements, we could confirm the performance of capillary and its potential for astronomical applications.
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Yoshito Haba, Ryo Iizuka, Akira Hayakawa, Kazutami Misaki, Ryo Shibata, Kei Itoh, Hideyuki Mori, Yoshitomo Maeda, Manabu Ishida, and Hideyo Kunieda "X-ray characterization of capillary system", Proc. SPIE 4851, X-Ray and Gamma-Ray Telescopes and Instruments for Astronomy, (11 March 2003);

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