| 研究課題/領域番号 |
20F20803
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| 研究種目 |
特別研究員奨励費
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| 配分区分 | 補助金 |
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| 応募区分 | 外国 |
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| 審査区分 |
小区分15020:素粒子、原子核、宇宙線および宇宙物理に関連する実験
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| 研究機関 | 国立天文台 |
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研究代表者 |
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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| 研究分担者 |
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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| 研究期間 (年度) |
2020-11-13 – 2023-03-31
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| 研究課題ステータス |
完了 (2022年度)
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| 配分額 *注記 |
2,100千円 (直接経費: 2,100千円)
2022年度: 900千円 (直接経費: 900千円)
2021年度: 800千円 (直接経費: 800千円)
2020年度: 400千円 (直接経費: 400千円)
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| キーワード | KAGRA / filter cavity / freq. dep. squeezing / sapphire / optical absorption / birefringence / liquid crystals |
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| 研究開始時の研究の概要 |
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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| 研究実績の概要 |
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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| 現在までの達成度 (段落) |
令和4年度が最終年度であるため、記入しない。
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| 今後の研究の推進方策 |
令和4年度が最終年度であるため、記入しない。
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