2013 Fiscal Year Final Research Report
Development of the multi-layer high-reflectivity polarizing mirror for the magnetic field measurement of the solar atmosphere in Lyman-alpha line
| Project/Area Number |
24740134
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Astronomy
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| Research Institution | Japan Aerospace Exploration Agency |
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Principal Investigator |
NARUKAGE Noriyuki 独立行政法人宇宙航空研究開発機構, 宇宙科学研究所, 宇宙航空プロジェクト研究員 (50435806)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Keywords | 偏光測定 / ライマンα線 / 真空紫外線 / 多層膜コーティング / 太陽 / 彩層磁場 |
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| Research Abstract |
I developed the multi-layer high-reflectivity polarizing mirror for the magnetic field measurement of the solar atmosphere in Lyman-alpha line (121.6 nm). This mirror consists of MgF2 and SiO2 layers on a Fused Silica substrate. I fabricated the test pieces of this type mirror, and measured their performance at the Synchrotron facility. The measured reflectivities for s- and p- polarized lights in Lyman-alpha line are Rs = 54.8% and Rp = 0.29%, respectively. Hence, the polarizing power P = (Rs-Rp)/(Rs+Rp) is 0.99. This means that this mirror reflect almost only s-polarized light. The Rs of this mirror is about 2.5 times larger than the MgF2 plate that is commonly used and whose Rs is 22%. On the basis of these results, it is concluded that the high-reflectivity polarizing mirror has been successfully developed.
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