Reduction of Gravity-Gradient Noise for Gravitational-Wave Observation

减少引力波观测的重力梯度噪声

• 批准号: 22H01246
• 负责人: 安東 正樹
• 金额: $ 10.82万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2022
• 资助国家: 日本
• 起止时间: 2022-04-01 至 2027-03-31
• 项目状态: 未结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-22H01246/
• 关键词: 重力波; 重力勾配雑音; ねじれ振り子; レーザー干渉計; 低温; 重力波望遠鏡; 低温干渉計; 防振

本研究では， (1) 現在稼働している重力波望遠鏡KAGRAにおける非定常な重力勾配雑音の除去をおこなうこと, (2) 将来の重力波望遠鏡のための重力勾配雑音の低減手法の研究を推進すること，を目的とする．そのために， 0.1Hz付近という低いの周波数帯で，地面振動や大気揺らぎに起因する重力勾配変動を観測する，重力勾配計の開発を進めた．本年度は，熱雑音を避けるために低温下で動作し，かつ，外乱振動に対して強固である，シリコンモノリシック干渉計の開発を進め，その部品の調達，各コンポーネントの低温環境試験，モノリシック干渉計の構築系の開発を進めた上で，干渉計動作を実現した．干渉計の初期アラインメントにおいて調整が困難な箇所もあったが，忍耐強い調整と，補償光学系の検討も進め，今後の知見を蓄えた．また，低温懸架に用いるサファイアファイバのねじれモードの機械損失測定を進め，エネルギーの損失要因について系統的な調査を進めた．懸架系の振り子モードとのカップリングによって損失が増大している可能性を示唆する結果が得られ，系統的な測定，計算の両面からの研究を進めた，さらに，従来のレーザー干渉計を用いた波面センサの性能を向上させる改良型WFSの開発を進め，その原理実証実験を行うとともに，能動防振系に組み込むための傾斜計の開発を進めた．また，重力勾配計のねじれ振り子部の概念設計検討の一環として，必要となる要素技術の洗い出しとトレードオフ検討を進めた．

In this study, (1) in the present study, (1) at present, there is an increase in the number of unsteady gravitational waves. (2) in the future, the research on the technique of low-pitched KAGRA waves in the future will improve the performance of gravity waves. The purpose of this study is to improve the performance of gravity waves, and to reduce the number of cycles in 0.1Hz. The cause of the ground vibration is that the gravity equipment is in operation, and the gravity mapping is in operation this year. This year, the sound is used to avoid the operation at low temperature. This year, it is necessary to strengthen the environment at low temperature. the equipment is in good condition, and the environment is in good condition. In the beginning of the training program, the training program has been completed, and the operation has been realized. in the early days of the program, the training was completed, the training was completed, the training was carried out, and the improvement was made in the Department of Optics. The cryogenic rack is used to measure the mechanical loss of the cryogenic rack, which is due to the failure of the mechanical system of the cryogenic track. the vibration of the frame is due to the failure of the system. The possibility of failure is demonstrated by the possibility that the results will be successful, the measurement of the system and the calculation of the performance of the system will be carried out. In recent years, the performance of the improved WFS has been improved, and the principle has been improved. It can operate the anti-vibration system, and can operate the anti-vibration system. In this way, it can be used to improve the performance of the system. It is necessary to use essential technology to improve the quality of the market.

项目成果

Angular trapping of a linear-cavity mirror with an optical torsional spring

• DOI: 10.1103/physreva.106.013514
• 发表时间: 2021-10
• 期刊: Physical Review A
• 影响因子: 2.9
• 作者: T. Kawasaki;K. Komori;Hiroki Fujimoto;Y. Michimura;M. Ando

The Current Status of Torsion-Bar Antenna (TOBA) Experiment

扭杆天线（TOBA）实验现状

• 发表时间: 2022
• 作者: Satoru Takano;Ching Pin Ooi;Yuka Oshima;Yuta Michimura;Masaki Ando:
• 通讯作者: Masaki Ando:

ねじれ振り子型重力波望遠鏡TOBA(Phase-III)の開発(38): 低温モノリシック干渉計の開発と観測

扭摆引力波望远镜TOBA的研制（第三期）（38）：低温整体干涉仪的研制和观测

• 发表时间: 2023
• 作者: 青山愛;平野弘之;渡邉信元;長田裕之;仙波憲太郎;高野哲，大島由佳，Ooi Ching Pin，Minseo Choi，Cao Mengdi，道村唯太，安東正樹
• 通讯作者: 高野哲，大島由佳，Ooi Ching Pin，Minseo Choi，Cao Mengdi，道村唯太，安東正樹