| Project/Area Number |
16340059
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Astronomy
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| Research Institution | Ehime University |
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Principal Investigator |
AWAKI Hisamitsu Ehime University, Graduate School of Science and Engineering, Professor, 大学院理工学研究科, 教授 (30252414)
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| Project Period (FY) |
2004 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥14,900,000 (Direct Cost: ¥14,900,000)
Fiscal Year 2006: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2005: ¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 2004: ¥9,200,000 (Direct Cost: ¥9,200,000)
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| Keywords | X-ray telescope / mirror substrate / magnesium alloy / press forming / high precision processing |
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| Research Abstract |
Wolter type-I optics, which are the most widely used in X-ray astronomy, consists of confocal paraboloidal and hyperboloidal reflectors. We proposed to develop an advanced thin foil substrate having the Wolter optics for future large X-ray telescopes with a high spatial resolution. The goals of our research are make an advanced thin foil with the Wolter geometry from one sheet of thin foil by hydraulic press and thermal forming, and to demonstrate replication of the thin foil with Wolter geometry.
(1) Development of the Wolter shaped two-stage foil
We pressed one sheet of Mg foil which has a length of 200 mm/stage and a thickness of 0.3 mm, and formed a Wolter shaped foil with a figure error of about a peak-to-peak value of +/-30mm. The figure error enables us to make a replication to realize a smooth surface on the thin foil. The use of Mg foil for a telescope substrate is the first experiment, and Mg alloy is useful to reduce weight of X-ray telescope.
(2) Replication of the two-stage foil
Replication of a short foil (100mm long) has been established, but the replication of a long thin foil (400mm/two-stage) was the first experiment for us. We tried replication of the two-stage foil in collaboration with Nagoya University. The thin foil with a smooth surface was successfully replicated off from a glass mandrel. We evaluated an image quality of the thin foil with the ISAS X-ray beam facility. Although the image quality in the X-ray band is limited by an accuracy of our glass mandrel, we demonstrated the replication of the thin foil.
Through this research, we obtained the key technique to make a large X-ray mirror. This technique is necessary for fabrication of a large X-ray telescope with a high spatial resolution carried on future X-ray missions.
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