| Project/Area Number |
20F20803
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Single-year Grants |
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| Section | 外国 |
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| Review Section |
Basic Section 15020:Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics
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| Research Institution | National Astronomical Observatory of Japan |
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Principal Investigator |
LEONARDI MATTEO 国立天文台, 重力波プロジェクト, 特別客員研究員 (90816448)
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| Co-Investigator(Kenkyū-buntansha) |
EISENMANN MARC 国立天文台, 重力波プロジェクト, 外国人特別研究員
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| Project Period (FY) |
2020-11-13 – 2023-03-31
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| Project Status |
Completed (Fiscal Year 2022)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2022: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2021: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2020: ¥400,000 (Direct Cost: ¥400,000)
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| Keywords | KAGRA / filter cavity / freq. dep. squeezing / sapphire / optical absorption / birefringence / liquid crystals |
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| Outline of Research at the Start |
Gravitational wave (GW) astronomy has became a mature research field. At five years from the first detection of a GW, almost one hundred more have been detected. To keep pushing this trend, the GW detectors need to be improved. In particular, for the Japanese detector KAGRA, the main limitation is its quantum noise. Dr. Eisenmann, together with the TAMA Filter Cavity team members, will design and and implement a quantum noise suppression system in KAGRA using frequency dependent squeezed state of light. He will also contribute to the commissioning of KAGRA interferometer.
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| Outline of Annual Research Achievements |
From April 2022, Dr. Eisenmann participated to the characterization and improvement of the Filter Cavity (FC) optical losses and design of the frequency dependent squeezing setup to be implemented in KAGRA in future runs. He performed several simulations on to optimize the FC's mirror properties in order to fit the KAGRA's requirement and also contributed in a major way in the design of the intermediate optics that will be crucial for the injection of frequency independent squeezing in the FC and from the FC to the interferometer.
He also was a key member for the characterization of sapphire substrates and in the development of novel techniques to not only perform faster and more accurate characterization of the birefringence of sapphire but also to mitigate the effect of such birefringence in the automatic alignment system of KAGRA. On the development of novel characterization system, he in the first place optimized the already existing linear polarimeter, and then autonomously developed a novel technique based on liquid crystal technology. With such setup, currently under testing at NAOJ, samples as large as KAGRA mirrros will be characterized within one day, without loosing any precision compared to the current method. It is to be noted that current setup requires more than one week to perform the characterization, and this could become a problem in the future when the size of the test masses will be increased.
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| Research Progress Status |
令和4年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
令和4年度が最終年度であるため、記入しない。
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