RUI: End to end modeling of Advanced LIGO Inout Optics

本项目的科学目标是利用LIGO端到端（e2e）仿真包为AdvLIGO （Advanced LIGO）探测器的输入光学系统建立时域模型。有了这些模型，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的设计。LIGO探测器是迈克尔逊干涉仪，设计用于探测极小的时空应变。为了增加光路，臂被配置为光腔。输入光学系统位于激光源和干涉仪之间，其主要功能是减小入射光束的空间抖动，实现输出光束与干涉仪的模式匹配。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某个AdvLIGO子系统。本项目的作用是将其他小组开发的子系统模型结合起来，研究集成系统的性能。为此，(1)建立了集成系统的端到端模型，(2)通过与测量的对比验证了所建立的模型，(3)在各种现实条件下对系统的性能进行了评估。这个项目将为本科生提供参与项目的宝贵机会，从而不仅学习相关的物理知识，而且学习作为项目团队成员的基本协作技能，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.