The Stanford Advanced Gravitational Wave Detector Research Program

斯坦福高级引力波探测器研究计划

• 批准号: 0855350
• 负责人: Robert Byer
• 金额: $ 95万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-06-15 至 2012-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0855350&HistoricalAwards=false
• 关键词: Stanford; Advanced; Gravitational; Wave; Detector

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). This award extends the Stanford LIGO group's ongoing program on advanced gravitational wave detectors to address risk mitigation for Advanced LIGO and to provide research for enhancements to Advanced LIGO to increase observatory sensitivity. In particular, research will focus on improved optical coatings, control of electrostatic charging, and tilt sensing for the seismic isolation system. (1) The team will include new expertise in NMR spectroscopy of amorphous oxides in the earth's crust and Raman spectroscopy, to obtain micro-structural information on bond configurations in the selected coating materials. Thermal noise due to mechanical noise in these coatings will limit the sensitivity of any future interferometer beyond Advanced LIGO. Thus the goal of this research is to understand the physics of the mechanical loss mechanisms so that we can inform other researchers in the LIGO Scientific Collaboration (LSC) on the mitigation of this noise source. (2) The team will also work with the LSC to develop requirements for a charge management system for Advanced LIGO. Scaling arguments will be used to predict which sources of potential electrostatic charge accumulations might be dominant. Numerical calculations will prioritize them and identify those that merit full finite-element modelling of their contribution to the noise budget. Development of mitigation techniques will include research on alkali ion in-diffusion to achieve weakly conducting test mass surfaces that will allow spurious surface charges to relax to equipotentials without impacting the optical and mechanical coating losses. A localized UV LED conduction channel to allow passive charge equilibration between the test mass and the grounded frame without damage to the UV-sensitive optical coatings will be evaluated. 3) Research will be initiated to develop improved tilt sensors for increasing the performance of the active seismic isolation systems in Advanced LIGO using externally excited, passive ring optical gyroscopes which could be used to directly measure the ground rotations and improve the performance of the isolation systems which would lead to improved operational reliability of Advanced LIGO. This research program includes participation from many disciplines including mechanical, electrical and control engineers, physicists and materials researchers. The nature of this multidisciplinary effort makes it ideal for training graduate students. High school students and university undergraduates are encouraged to participate in these projects, integrating research and education. In addition, the program will develop and transfer technologies to the commercial stream.

该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。该奖项扩展了斯坦福大学LIGO小组正在进行的高级引力波探测器计划，以解决Advanced LIGO的风险缓解问题，并为Advanced LIGO的增强提供研究，以提高天文台的灵敏度。特别是，研究将集中在改进的光学涂层，控制静电充电，和倾斜传感的地震隔离系统。(1)该小组将包括在地壳和拉曼光谱的无定形氧化物的核磁共振光谱学的新的专业知识，以获得在选定的涂层材料的键配置的微观结构信息。由于这些涂层中的机械噪声引起的热噪声将限制任何未来干涉仪的灵敏度，而不是先进的LIGO。因此，本研究的目标是了解机械损失机制的物理学，以便我们可以告知LIGO科学合作组织（LSC）的其他研究人员如何减轻这种噪声源。(2)该团队还将与LSC合作，为Advanced LIGO的电荷管理系统制定要求。 缩放参数将被用来预测潜在的静电电荷积累的来源可能是占主导地位的。 数值计算将优先考虑这些因素，并确定那些值得对其对噪声预算的贡献进行全面有限元建模的因素。 缓解技术的开发将包括对碱离子内扩散的研究，以实现弱导电的测试物质表面，这将允许虚假的表面电荷放松到等电位，而不影响光学和机械涂层损失。将评估局部UV LED传导通道，以允许测试质量和接地框架之间的被动电荷平衡，而不会损坏UV敏感光学涂层。3)将开始研究开发改进的倾斜传感器，以提高Advanced LIGO中主动地震隔离系统的性能，使用外部激励的被动环形光学陀螺仪，可用于直接测量地面旋转并提高隔离系统的性能，从而提高Advanced LIGO的运行可靠性。 该研究计划包括许多学科的参与，包括机械，电气和控制工程师，物理学家和材料研究人员。这种多学科努力的性质使其成为培养研究生的理想选择。鼓励高中生和大学生参与这些项目，将研究与教育结合起来。此外，该计划将开发和转让技术的商业流。