RUI: End to end modeling of Advanced LIGO Inout Optics

该项目的科学目标是使用LIGO端到端(E2e)仿真包为高级LIGO(AdvLIGO)探测器的输入光学系统建立时域模型。利用这些模型，将进行各种数值测试，以更好地了解探测器的性能并评估AdvLIGO设计。LIGO探测器是迈克尔逊干涉仪，旨在探测极小的时空应变。为了增加光路，臂被配置为光学腔。输入光学系统设置在激光光源和干涉仪之间，其主要功能是减小入射激光的空间抖动和使输出光束与干涉仪进行模式匹配，这些活动是对各个LIGO科学合作(LSC)工作组任务的补充，每个工作组都专注于设计特定的AdvLIGO子系统。这个项目的作用是结合其他小组开发的那些子系统模型，并研究集成系统的性能。为此，(1)建立了集成系统的e2E模型，(2)通过与测量结果的比较对所建模型进行了验证，(3)对系统在各种实际条件下的性能进行了评估。这个项目将为本科生提供宝贵的机会参与这个项目，从而不仅学习相关的物理，而且作为项目团队的一员，还可以学习基本的协作技能，如责任和时间管理。

The scientific objective of this project is to build time-domain models for the Input Optics system of the Advanced LIGO (AdvLIGO) detector using the LIGO end-to-end (e2e) simulation package. With these models, various numerical tests will be performed to better understand the detector's performance and assess the AdvLIGO design. The LIGO detectors are Michelson interferometers designed to detect extremely small strain of space-time. To increase the optical path, the arms are configured as optical cavities. The input optics system is placed between the laser source and the interferometer, and its main function is to reduce the spatial jitter of the incoming laser beam and mode match the output beam to the interferometer.These activities are complementary to the tasks of various LIGO Scientific Collaboration (LSC) working groups, each of which focuses on designing a certain AdvLIGO subsystem. The role of this project is to combine those subsystem models developed by other groups, and study the performance of the integrated system. To this end, (1) an e2e model of the integrated system is built, (2) the built model is validated through comparison with measurement and (3) the system's performance is assessed under various realistic conditions. This project will provide valuable opportunities for undergraduate students to participate in the project and thus to learn not only related physics but also basic collaborative skills as a member of the project team such as responsibility and time management.