Radiative Cooling of the Thermally Isolated System in KAGRA Gravitational Wave Telescope
Radiative Cooling of the Thermally Isolated System in KAGRA Gravitational Wave Telescope
复制标题
KAGRA引力波望远镜热隔离系统的辐射冷却
DOI：
10.1088/1742-6596/1857/1/012002
复制
发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Tomohiro Yamada et al[KAGRA Collaboration]
中科院分区：
文献类型：
--
作者：
ATLAS Collaboration;Tomohiro Yamada et al[KAGRA Collaboration]
对KAGRA引力波望远镜绝热系统的辐射冷却进行了研究。KAGRA是一种基于激光干涉仪的探测器，构成光学腔的主镜被冷却到20K，以减少热波动引起的噪声。反射镜悬挂在多级摆上，以隔离任何振动。因此，该反射镜悬挂系统具有很少的热链路以减少振动注入。因此，该系统主要通过热辐射冷却。为了了解反射镜的辐射冷却过程，分析了基于质量和比热的冷却曲线。结果发现，一种被称为“低温管道屏蔽”的低温部件似乎在镜面冷却的开始阶段有很大的贡献。这一发现将有助于为下一代低温引力波探测器设计新的冷却系统。
Radiative cooling of the thermally isolated system is investigated in KAGRA gravitational wave telescope. KAGRA is a laser interferometer-based detector and main mirrors constituting optical cavities are cool down to 20K to reduce noises caused by the thermal fluctuation. The mirror is suspended with the multi-stage pendulum to isolate any vibration. Therefore, this mirror suspension system has few heat links to reduce vibration injection. Thus, this system is mainly cooled down with thermal radiation. In order to understand the process of radiative cooling of the mirror, we analyzed cooling curve based on mass and specific heat. As a result, it was newly found that a cryogenic part called" cryogenic duct-shield" seems to have large contribution in the beginning of the mirror cooling. This finding will help to design new cooling system for the next generation cryogenic gravitational wave detector.