Recent results from hard X-ray telescope characterization at SPring-8
2009
We have been developing a hard X-ray imaging telescope with Pt/C multilayers for balloon experiments and
for ASTRO-H. Calibration of the hard X-ray telescope has been performed at the synchrotron radiation facility,
SPring-8, to obtain point spread function and effective area for the InFOCuS and SUMIT experiments. Hard
X-ray characterization at the SPring-8 beamline BL20B2 has great advantages over those with conventional
sources, such as an extremely high flux, a larger beam with less divergence, and a selectable, narrow bandwidth
covering the hard X-ray region from 20 to over 100 keV. We have been successful not only in characterizing the
telescope but also in establishing the tuning procedure to improve its image quality. The 16m-long experimental
hutch has sufficient capability for characterization of the telescope with a long focal length up to 12 m as well
as reflectivity and diffraction measurements of multilayer reflectors. Recently we have measured 87 pairs of
multilayer mirrors and obtained an angular resolution of 1.5 arcmin (HPD), and reflectivity of Pt/C multilayers
designed for ASTRO-H. In this paper, we report recent results of X-ray measurements of our hard X-ray telescope
and multilayer mirrors.
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