Abstract
High sensitivity hard X-ray data by means of focusing optics is crucially important to investigate active galaxies and cluster of galaxies. We have developed focusing telescopes with multilayer coatings. The energy band is broadened by multilayers with graded periodic length, so called ‘ Supermirrors’. We are successful to obtain hard X-ray images in the energy band from 25 to 40 keV with a demonstration model of telescope with 20 mirror shells of supermirrors. The application of supermirrors to the balloon-borne hard X-ray telescope is discussed.
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