RUI: Investigating Ice Formation on Optical Surfaces and Material Properties for Cryogenic Gravitational Wave Detectors

该奖项支持相对论和相对论天体物理学的研究，并解决了NSF“宇宙之窗”大理念的优先领域。几年前，也就是爱因斯坦广义相对论预测引力波存在的一个世纪后，美国国家科学基金会资助的激光干涉仪引力波天文台（LIGO）首次探测到了黑洞或中子星合并引起的时空扭曲。这一发现打开了一扇了解宇宙的新窗口，并催生了引力波天文学的新领域。为了帮助实现这一新领域的承诺，该奖项将支持使用冷却至极低温度的光学器件开发具有扩展范围和灵敏度的新探测器。具体来说，它将资助研究，以更好地理解和克服当冰层在冷光学表面形成并改变其精心设计的特性时所产生的问题。通过向西华盛顿大学（一所主要的本科院校）的本科生提供研究机会，该项目将使他们能够获得可转移的技能，为学术界内外的未来职业生涯做准备。该奖项将通过支持引力波天文学的新发现来加深我们对宇宙的理解，并将有助于STEM的全球竞争力（科学、技术、工程和数学）领域，该奖项将资助西华盛顿大学的仪器科学研究，以支持下一代的发展。新一代引力波探测器的探测范围和灵敏度都有所提高。具体来说，它将解决低温引力波探测器中冷镜上的冰形成问题。这个问题已经成为KAGRA面临的一个重大挑战，它有可能在未来的低温引力波探测器中成为更大的问题，如LIGO旅行者或爱因斯坦望远镜。学生和PI将开发一个模块化的光学低温恒温器，适合在120K（LIGO Voyager的计划工作温度）下进行测量。该小组将使用这个低温恒温器来研究冷光学表面上的低温冰层，目的是更好地了解它们的特性，它们对低温引力波探测器的影响以及可能的缓解策略。即将建造的仪器还将推动与低温引力波探测器光学材料相关的进一步后续项目。该奖项反映了NSF的法定使命，并且通过使用基金会的知识价值和更广泛的影响进行评估，被认为值得支持审查标准。

This award supports research in relativity and relativistic astrophysics, and it addresses the priority areas of NSF's "Windows on the Universe" Big Idea. A few years ago, and a century after the existence of gravitational waves was predicted by Einstein's theory of general relativity, the NSF-funded Laser Interferometer Gravitational-Wave Observatory (LIGO) achieved the first detection of such distortions of spacetime caused by merging black holes or neutron stars. This discovery opened a new window into the universe and gave rise to the new field of gravitational wave astronomy. To help deliver on the promise of this new field, this award will support the development of new detectors with extended reach and sensitivity using optics cooled to very low temperatures. Specifically, it will fund research to better understand and overcome problems arising when ice layers form on the surfaces of cold optics and change their carefully designed properties. By providing research opportunities to undergraduate students at Western Washington University, a primarily undergraduate institution, the project will allow them to acquire transferable skills in preparation for future careers both in and outside of academia. The award will deepen our understanding of the universe by supporting new discoveries in gravitational wave astronomy, and it will contribute to a globally competitive workforce in the STEM (science, technology, engineering, and mathematics) field, both by training students and through outreach efforts to the public.This award will fund instrument science research at Western Washington University to support the development of next-generation gravitational wave detectors with increased reach and sensitivity. Specifically, it will address the problem of ice formation on cold mirrors in cryogenic gravitational wave detectors. This issue has emerged as a significant challenge for KAGRA, and it has the potential to be even more problematic in proposed future cryogenic gravitational wave detectors like LIGO Voyager or the Einstein Telescope. Students and the PI will develop a modular optical cryostat suitable for measurements at 120K, the planned operating temperature of LIGO Voyager. The group will use this cryostat to study cryogenic ice layers on cold optical surfaces, with the aim of better understanding their properties, their impact on cryogenic gravitational wave detectors, and possible mitigation strategies. The instrument to be built will also enable further follow-up projects related to optical materials for cryogenic gravitational wave detectors.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.