14 October 2005 Design and fabrication of multi-foil hard x-ray telescope for space observations
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Hard X-ray telescope by means of optics is one of the key technologies for future X-ray observatory programs. Introducing a telescope to hard X-ray region above 10 keV will improve sensitivity by one or two orders of magnitude. The principle of hard X-ray telescope is a depth-graded multilayer (supermirror) and high throughput, nested thin-foil grazing incidence optics. We have successfully developed a hard X-ray telescope sensitive up to 50 keV for balloon program InFOCuS. Effective area of 50 cm2 at 30 keV and image quality of 2.5 arcmin (HPD) were obtained from ground-based measurement and were also confirmed by in-flight calibration. Recent development achieved an improvement of image quality roughly by a factor of two. Japan's future X-ray satellite program NeXT has been proposed based on our technology.
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Yasushi Ogasaka, Yasushi Ogasaka, Koujun Yamashita, Koujun Yamashita, Ryo Shibata, Ryo Shibata, Keisuke Tamura, Keisuke Tamura, } "Design and fabrication of multi-foil hard x-ray telescope for space observations", Proc. SPIE 5962, Optical Design and Engineering II, 59621T (14 October 2005); doi: 10.1117/12.625116; https://doi.org/10.1117/12.625116

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