Low-vibration cryogenic test facility for next generation of ground-based gravitational-wave observatories.

IF 1.3 4区 工程技术 Q3 INSTRUMENTS & INSTRUMENTATION Review of Scientific Instruments Pub Date : 2025-01-01 DOI:10.1063/5.0236965
D P Kapasi, T G McRae, J Eichholz, P A Altin, D E McClelland, B J J Slagmolen
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Abstract

We present the design and commissioning of a cryogenic low-vibration test facility that measures displacement noise from a gram-scale silicon cantilever at the level of 10-16m/Hz at 1 kHz. This sensitivity is necessary for future tests of thermal noise models on cross sections of silicon suspension samples proposed for future gravitational-wave detectors. A volume of ∼36 l is enclosed by radiation shields cooling an optical test cavity that is suspended from a multi-stage pendulum chain providing isolation from acoustic and environmental noise. This 3 kg test cavity housing a crystalline silicon cantilever is radiatively cooled to 123 K in 41 h and held at that temperature over many months with a relative temperature stability of ±1 mK. The facility housing the test cavity is sensitive to cavity length changes, which can resolve thermal fluctuations at the desired sensitivity. It is capable of interferometrically measuring temperature-dependent broadband displacement noise directly between 50 Hz and 10 kHz, where current and future ground-based gravitational wave observatories are the most sensitive. With a suitable cantilever design, the cryogenic facility we describe here will allow for the measurement of broadband thermal noise in crystalline silicon at 123 K. This will guide the design of suspensions in planned future cryogenic ground-based gravitational-wave detectors such as LIGO Voyager and may have implications for suspensions in the Einstein Telescope. This facility is also suitable for the testing of new mirror coatings at cryogenic temperatures.

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下一代地面引力波观测站的低振动低温试验设施。
我们介绍了一个低温低振动测试设备的设计和调试,该设备可以测量来自克级硅悬臂的位移噪声,频率为10-16m/Hz,频率为1khz。这种灵敏度对于未来引力波探测器所提出的硅悬浮液样品横截面热噪声模型的测试是必要的。约36l的体积被辐射屏蔽罩包围,冷却光学测试腔,该腔悬挂在多级摆链上,与声学和环境噪声隔离。这个装有晶体硅悬臂的3公斤测试腔体在41小时内辐射冷却到123 K,并在该温度下保持数月,相对温度稳定性为±1 mK。容纳测试腔体的设备对腔体长度变化很敏感,可以在所需的灵敏度下解决热波动。它能够直接在50赫兹和10千赫之间干涉测量与温度相关的宽带位移噪声,这是当前和未来地面引力波天文台最敏感的地方。通过合适的悬臂设计,我们在这里描述的低温设备将允许在123 K下测量晶体硅中的宽带热噪声。这将指导未来计划中的低温地面引力波探测器(如LIGO Voyager)的悬架设计,并可能对爱因斯坦望远镜的悬架产生影响。该设备也适用于在低温下测试新的镜面涂层。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Review of Scientific Instruments
Review of Scientific Instruments 工程技术-物理:应用
CiteScore
3.00
自引率
12.50%
发文量
758
审稿时长
2.6 months
期刊介绍: Review of Scientific Instruments, is committed to the publication of advances in scientific instruments, apparatuses, and techniques. RSI seeks to meet the needs of engineers and scientists in physics, chemistry, and the life sciences.
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