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11 March 2003 Development of thin foil substrates for an x-ray telescope: II
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We propose a method to make advanced thin-foil substrates for an X-ray telescope by press forming. Walter Type-I optics, which reflect X-rays twice with their confocal paraboloidal and hyperboloidal reflectors, have commonly been used in X-ray astronomy. However, it is difficult to make substrates for a large X-ray telescope with a high imaging quality. By forming two reflectors from one thin substrate, the accuracy of the angle between two reflectors is determined by the accuracy of a mandrel or a stamping die. We made a stamping die using a precision processing method at RIKEN. After several improvements of our pressing method, we have obtained the substrates with a figure error < 15 um, which corresponds to an angular resolution of about 2' at the focal plane, although a small waviness was found in the mirror surface. We also propose a new holding method of the foil to reduce a displacement of the foil positions. The foil is tightly held with three thin-supports with a thickness of 0.3 mm. We made the test model of a mirror housing, and found that the foil position was determined with σ~12μm.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hisamitsu Awaki, Kazunori Heike, Youichi Misao, Yuzuru Tawara, Yasushi Ogasaka, Hideyo Kunieda, Hitoshi Ohmori, Weimin Lin, Sei Moriyasu, Yoshiyuki Ueno, Shin-ya Morita, Kazutoshi Katahira, Changling Liu, Hiromichi Honda, and Susumu Shioya "Development of thin foil substrates for an x-ray telescope: II", Proc. SPIE 4851, X-Ray and Gamma-Ray Telescopes and Instruments for Astronomy, (11 March 2003);


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