Physics – Optics
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005spie.5900..418a&link_type=abstract
Optics for EUV, X-Ray, and Gamma-Ray Astronomy II. Edited by Citterio, Oberto; O'Dell, Stephen L. Proceedings of the SPIE, Volum
Physics
Optics
Scientific paper
We are studying on a press forming of a 0.3-mm-thick foil in order to make advanced thin-foil substrates with a two-stage reflector for large X-ray telescopes. Aluminum alloy has been used as a material for thin-foil substrates. We propose a use of Mg foil as lightweight substrates, since more lightweight material is necessary for building the large telescopes. Furthermore, we are making a two-stage reflector with a stage 200 mm long, since a long substrate has an advantage for fabrication of large X-ray telescopes. After various experiments, we formed a Mg foil with a figure error of +/-20 μm. This large figure error can be removed by a replication method. We also made an evaluation system of an image quality by using a Newtonian telescope. The evaluation system can generate a collimated optical light with a diameter of 450 mm and with a parallelism of about 4". Using this system, we found that an image quality of our Mg foil was similar to that of the ASCA foils.
Awaki Hisamitsu
Heike Kazunori
Honda Hiromichi
Shioya Susumu
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