| Project/Area Number |
15H05441
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Astronomy
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| Research Institution | The University of Tokyo (2016-2017)
Japan Aerospace EXploration Agency (2015) |
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Principal Investigator |
Matsumura Tomotake 東京大学, カブリ数物連携宇宙研究機構, 特任准教授 (70625003)
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| Research Collaborator |
KATAYAMA Nobuhiko 東京大学, カブリ数物連携宇宙研究機構, 教授 (50290854)
SAKURAI Yuki 東京大学, カブリ数物連携宇宙研究機構, 特任研究員 (50780847)
OHSAKI Hiroyuki 東京大学, 大学院新領域創成科学研究科, 教授 (10203754)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥23,790,000 (Direct Cost: ¥18,300,000、Indirect Cost: ¥5,490,000)
Fiscal Year 2017: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2016: ¥16,380,000 (Direct Cost: ¥12,600,000、Indirect Cost: ¥3,780,000)
Fiscal Year 2015: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
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| Keywords | インフレーション / 宇宙マイクロ波背景放射 / 偏光観測 / 応用超電導 / 超電導磁気軸受 / レーザー加工 / インフレーション仮説の検証 / 宇宙マイクロ波背景放射偏光観測 / 偏光変調器 / 広帯域反射防止機構 / 低温駆動機構 / 超電導軸受 / 半波長板 / 電波天文学 / 宇宙物理 / 偏光変調機 / 超伝導軸受け |
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| Outline of Final Research Achievements |
The theory of inflation is testable by using the measurement of the cosmic microwave background (CMB) polarization. The expected sensitivity for a next-generation CMB polarization experiment is to probe the nano-Kelvin fluctuation. The experimental challenge comes when one has to make a distinction between the signal and the instrumentally induced fluctuation. In order to overcome this challenge, we develop a polarization modulator using a cryogenically cooled continuously rotating broadband half-wave plate. We achieve a broadband anti-reflection by a moth-eye structure and also we build a rotational mechanism using a superconducting magnetic bearing. We characterize its thermal, optical, and kinematic performances experimentally, and demonstrate the applicability of such this system for a next-generation CMB polarization experiment.
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