Development of a Variable Bandwidth Laser Interferometer Gravitational Wave Antenna

可变带宽激光干涉仪引力波天线的研制

基本信息

批准号：
13440087
负责人：
KAWAMURA Seiji
金额：
$ 8.19万
依托单位：
National Astronomical Observatory
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13440087/
关键词：
Gravitational Wave Laser Interferometer Variable Bandwidth Interferometer

项目摘要

There are several projects going on, which aim at gravitational wave detection using laser interferometers : the Japanese TAMA project, the American LIGO project, the French-Italian VIRGO project, and the German-British GEO project. It is quite possible that gravitational waves could be detected in several years. However, it is necessary to improve the sensitivity of the antennas further in order to establish the gravitational wave astronomy.The resonant sideband extraction (RSE), which is a variable bandwidth interferometer, is one of the advanced technologies that could improve the sensitivity of the interferometer in a limited frequency band.There has been several basic experiments on the RSE interferometer so far, but they were all performed as table-top experiments in the air, as well as they were all using multi-modulation schemes for signal extraction. Since the RSE interferometer requires an extremely high finesse of the arm cavity, thus, extremely high reflectivity of the mirr … More ors, it is not preferable to operate the interferometer in the air because of possible degradation of the mirrors in the air. Also the table-top experiment uses mirrors fixed to the table, which are very different from the suspended mirrors in a real gravitational wave lantenna. Moreover, the multi-modulation scheme makes the interferometer control even more complicated.Therefore in this research, we performed the experiment in the vacuum system using a small suspension system, which made it possible to have a better and more realistic environment. Also we invented a single modulation method for signal extraction, which ensures the simplicity of the control system. We have succeeded in operating the RSE interferometer using the single modulation with the third harmonic demodulation in a vacuum system using suspended mirrors for the first time in the world. We also successfully developed an induced current damping method for the small suspension system. Other than the above-mentioned success, we have been investigating the possibility of using a polarization method in a table-top experiment. In the theoretical aspect of the RSE interferometer, we have been analizing the quantum noise of the interferometer.With all the efforts and success altogether we believe that we will be ready to finalize the design of the RSE interferometer for the future large antenna just by optimizing the design parameters by further experiment. Less

有几个项目正在进行，旨在使用激光干涉仪进行引力浪检测：日本的TAMA项目，美国LIGO项目，法国 - 意大利处女座项目和德国 - 英国的GEO项目。很有可能在几年内检测到引力波。但是，有必要进一步提高天线的敏感性，以建立引力波天文学。谐振侧带提取（RSE）是一种可变的带宽干扰，是一种先进的技术，可以提高有限频段中的干扰敏感性。在有限的频率上，对效果的效果均取得了几个基本实验，但相比之下。他们都在使用多调制方案进行信号提取。由于RSE干扰需要非常高的手臂腔，因此，镜子的反射率极高……更多的ORS，由于空气中的镜子可能会降解，因此不希望在空中操作空气中的干涉仪。台面实验也使用固定在桌子上的镜子，这与真实重力波兰登纳（Lantenna）中的悬浮镜有很大不同。此外，多调制方案使干涉仪控制更加复杂。因此，在这项研究中，我们使用小型悬架系统在真空系统中进行了实验，这使得拥有更好，更现实的环境成为可能。另外，我们发明了一种用于提取信号的单个调制方法，以确保控制系统的简单性。我们已经成功地使用单个调制措施在世界上首次使用悬挂式镜子在真空系统中使用第三个谐波解调的单个调制来操作RSE干涉仪。我们还成功地为小悬架系统开发了一种诱导的当前阻尼方法。除了上述成功之外，我们一直在研究在桌面实验中使用极化方法的可能性。在RSE干涉仪的理论方面，我们一直在分析干涉仪的量子噪声。我们完全相信，我们将准备好通过进一步实验来优化设计参数的RSE干涉仪的设计。