BASIC STUDY ABOUT A VERTICAL LASER INTERFEROMETER

垂直激光干涉仪的基础研究

• 批准号: 16204016
• 负责人: MIYOKI Shinji
• 金额: $ 32.45万
• 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 (A)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16204016/
• 关键词: Seismic Noise Isolation; Vertical Laser Interferometer; Gravitational Wave; Mini-GAS Filter; Fabry-Perot Cavity; High Reflectance Low-loss Mirror; 垂直レーザー干渉計

Many projects for the first gravitational wave (GW) detection, such as Advanced-LIGO, EGO and LCGT, GW from binary neutron star coalescence, whose event rate is 1/100000 per a year and a galaxy, is mainly targeted. For this reason, they are enthusiastic to enhance their sensitivity to increase the observable galaxy numbers. Recently, theoretical super and hyper-novae explosion simulations seem to require anti-symmetrical (rotational) explosion process, which might produce extremely large amplitude gravitational waves (GW). Accounting for the supernovae event rate in a galaxy of 2/year and its large amplitude GW that can be detected by 100m-scale GW detectors, it also seems to be important to be able to identify positions of GW sources from supernovae in our galaxy as other astronomical observations. For the position identification, three interferometers (IFOs) are at least necessary. In the case that these three IFOs are situated nearby on the Earth, one of the three IFOs is desirable … More to have an arm (a Fabry-Perot cavity arm) in the vertical direction to have no dead angles. Accounting for this background, we started basic study about the construction of a laser interferometer that has a Fabry-Perot cavity in the vertical direction. We have constructed vertical mirror suspension and seismic noise isolation pendulums to construct the vertical Fabry-Perot cavity. This pendulum contained three vertical isolation stages. The first stage had 0.5 Hz mini-GAS filter and the second and the third stages had spring-like isolators (12Hz) using pseudoelasticity property of BOLFUR wires. As a light to be injected to the Fabry-perot cavity, 532nm wavelength laser was used (Innolight Inc. Prometheus-50, 50mW). A Pound-Drever-Hall method was used to obtain an error signal of a Fabry-Perot cavity length. Consequently, the Fabry-Perot cavity whose mirrors are suspended by these vertical pendulum systems, has been successfully controlled to resonate, using either a magnet-coil actuation force between the mirror mass and coils or using a laser frequency control. On the other hand, the traditional horizontal laser interferometer's displacement sensitivity has reached 2x10^-16…3^*10^-17 [m/rHz] from 20Hz to 30Hz, which was the world best displacement noise level, and 3x10^-18 [m/rHz] at 100Hz (LIGO has 1x10^-19 [m/rHz] at 200Hz), that is ever best in Japan. Less

目前，国际上首次探测引力波的许多计划，如Advanced-LIGO、EGO和LCGT等，都主要是针对双中子星星合并产生的引力波，其事件发生率为1/10万/年，一个星系。出于这个原因，他们热衷于提高他们的灵敏度，以增加可观测的星系数量。近年来，理论上的超新星爆炸模拟似乎需要反对称（旋转）爆炸过程，这可能会产生极大振幅的引力波。考虑到星系中超新星事件的发生率为2/年，并且其大振幅GW可以被100米尺度的GW探测器探测到，能够像其他天文观测一样确定我们星系中超新星GW源的位置似乎也很重要。对于位置识别，至少需要三个干涉仪（IFO）。在这三个IFO位于地球附近的情况下，三个IFO中的一个是理想的 ...更多信息 在垂直方向上具有臂（法布里-珀罗腔臂）以没有死角。在此背景下，我们开展了垂直法布里-珀罗腔激光干涉仪的基础研究。我们建造了垂直的反射镜悬挂和地震噪声隔离的实验室来建造垂直的法布里-珀罗腔。该摆包含三个垂直隔离级。第一级具有0.5Hz微型气体滤波器，第二和第三级具有利用BOLFUR线的伪弹性特性的弹簧状隔离器（12 Hz）。作为注入法布里-珀罗腔的光，使用532 nm波长的激光器（Innolight Inc. Prometheus-50，50mW）。采用Pound-Drever-Hall方法获得了法布里-珀罗腔长的误差信号。因此，法布里-珀罗腔的反射镜悬挂这些垂直摆系统，已成功地控制谐振，使用之间的磁线圈的驱动力的反射镜质量和线圈，或使用激光频率控制。另一方面，传统的水平激光干涉仪的位移灵敏度在20 Hz到30 Hz范围内达到2 × 10 ^-16. 3 ^*10^-17 [m/rHz]，这是世界上最好的位移噪声水平，在100 Hz时达到3 × 10 ^-18 [m/rHz]（LIGO在200 Hz时为1 × 10 ^-19 [m/rHz]），这是日本有史以来最好的。少

项目成果

Veto analysis of gravitational wave burst signals in TAMA300 data using an ALF Filter

使用 ALF 滤波器对 TAMA300 数据中的引力波突发信号进行否决分析

• 发表时间: 2006
• 期刊: Classical and Quantum Gravity 23・8
• 作者: Makoto Tawada;Conglai Fan;Xiaochun Li;T.Akutsu et al.
• 通讯作者: T.Akutsu et al.

The CLIO Project

克里奥项目

• 发表时间: 2006
• 期刊: Classical and Quantum Gravity 23
• 作者: S.Miyoki;T.Uchiyama;K.Yamamoto;M.Ohashi;K.Kuroda;T.Akutsu;S.Kamagasako;N.Nakagawa;M.Tokunari;K.Kasahara;S.Telada;T.Tomaru;T.Suzuki;N.Sato;T.Shintomi;T.Haruyama;A.Yamamoto;D.Tatsumi;M.Ando;A.Araya;A.Takamori;S.Takemoto;H.Momose;H.Hay
• 通讯作者: H.Hay

CLIO Project

克里奥项目

• 发表时间: 2006
• 期刊: Classical and Quantum Gravity (Accepted)
• 作者: T.Akutsu;M.Ando;N.Kanda;D.Tatsumi;S.Telada;S.Miyoki;M.Ohashi;the TAMA Collaboration;Y. Nishiura;S.Miyoki et al.
• 通讯作者: S.Miyoki et al.

Manufacturing of a 10-km-scale redius-of-curvature surface using a thin-film coating technique

使用薄膜涂层技术制造 10 公里级曲率半径表面

• 期刊: Optics Letters (印刷予定)
• 作者: Koji Shimomura;Kazuo Nishimura;S.Miyoki et al.
• 通讯作者: S.Miyoki et al.

Analysis of gravitational wave bursts in TAMA300 data using ALF Filter

使用 ALF 滤波器分析 TAMA300 数据中的引力波爆发

• 发表时间: 2006
• 期刊: Classical and Quantum Gravity 23・19
• 作者: D.Fathi;L.Elisabeth;Y.Nishiura;T.Akutsu et al.
• 通讯作者: T.Akutsu et al.