| Project/Area Number |
23340052
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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 | National Astronomical Observatory of Japan |
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Principal Investigator |
HARA Hirohisa 国立天文台, SOLAR-C準備室, 准教授 (20270457)
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| Co-Investigator(Renkei-kenkyūsha) |
KANO Ryohei 国立天文台, SOLAR-C 準備室, 助教 (70321586)
NARUKAGE Noriyuki 国立天文台, 先端技術センター, 特任研究員 (50435806)
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| Project Period (FY) |
2011-11-18 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥12,480,000 (Direct Cost: ¥9,600,000、Indirect Cost: ¥2,880,000)
Fiscal Year 2013: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2012: ¥11,700,000 (Direct Cost: ¥9,000,000、Indirect Cost: ¥2,700,000)
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| Keywords | 太陽物理学 / 光学 / 宇宙物理学 / 宇宙科学 |
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| Research Abstract |
In this study we have developed a holographically-ruled spherical concave grating with a laminar groove shape in collaboration with a domestic optics company for a sounding-rocket experiment CLASP (Chromospheric Lyman-Alpha Spectro-Polarimeter). The measurement of magnetic fields in the solar chromosphere and the transition region is the primary objective of the experiment by detecting the linear polarization through a spectro-polarimetric observation in the hydrogen Lyman alpha at 121.6 nm. The evaluation after the fabrication of the master grating of 3000 grooves/mm with an effective area within 110 mm in diameter shows that we have succeeded to develop a spherical concave grating with a high absolute grating efficiency of 25+/-5%, which satisfies the specification of the CLASP. We also developed a UV light-source system for evaluation of the grating performance in imaging spectroscopy.
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