Physics – Optics
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.4324t&link_type=abstract
American Astronomical Society, HEAD Meeting #5, #43.24; Bulletin of the American Astronomical Society, Vol. 32, p.1263
Physics
Optics
Scientific paper
We have been developing the high throughput hard X-ray telescope, using reflectors coated with the depth graded multilayer known as supermirror. InFOCuS, the International Focusing Optics Collaboration for micro-Crab Sensitivity is the project of the balloon observation of cosmic hard X-ray source with this type of hard X-ray telescope and CdZnTe pixel detector as a focal plane imager. The first balloon experiment is scheduled in the next summer and a mass production of thousands of reflectors has begun. To fabricate reflectors, we use the combination of Pt/C multilayer and epoxy replication technique with thin aluminum foil as a substrate, which is used for the ASTRO-E X-Ray telescope and a goal of angular resolution is set to 1 arcmin. Present reflector fabrication method consists of two steps, i) fabrication of replica foil mirror with Pt or Au single layer, ii) Deposition of Pt/C multilayer on a replica mirror. Another method is also investigated to reduce production time, which is direct fabrication of replica supermirror using a mandrel coated with Pt/C multilayer. The reflectivity of these supermirrors are high, same as that on the float glass substrate. Their interfacial roughness are expressed about 0.3-0.4 nm with Debye-Waller factor. The design of supermirror are optimized to have 100 cm2 effective area at 20 -- 40 keV and 10 arcmin. field of view for the telescope with 8 m focal length and a diameter of 40 cm. We will report current status of our balloon borne experiment and performance of our hard X-ray telescope.
Barber Ben
Berendse Fred
Chan Kai Wing
Dereniak E.
Fukuda Satoru
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