Search for primordial gravitational wave using polarization of cosmic microwave background radiation

整个2019财年，西蒙斯天文台（SO） CMB实验的仪器开发工作一直在继续。日本和美国将在2021年之前开发和部署的小孔径望远镜（SAT）的光学设计已经完成，第一颗SAT的制造正在进行中。我们与SO日本合作者一起，一直在制造包含SAT仪器光学透镜的光学管。第一个光学管即将完成，并将在不久的将来与SAT接收器集成。第二和第三个光学管的制造也在日本开始。减少杂散光系统的SAT平台和屏蔽的制造也在进行中。SO日本合作者会议也在整个财政年度定期举行。在2019财年，我们在日本组织了四次季度面对面会议，并参加了在美国举行的一次全面（全球）合作会议。SO的日本合作者定期在日本举行的两年一次的JPS和ASJ会议上介绍和更新SO的开发进展。下一代CMB-S4实验的计划已经开始，该实验将在本世纪20年代开始仪器开发。SO的一些日本合作者也是CMB-S4研发团队的一部分，我们一直在研究下一代小口径望远镜阵列的参考设计概念。2019财年还在美国举行了全球CMB-S4合作会议。

The instrument development for the Simons Observatory (SO) CMB experiment has continued throughout the 2019 fiscal year. The optics design of the small aperture telescopes (SATs), that Japan and USA will develop and deploy by 2021, has completed and fabrication of the first SAT is in-progress. We, along with the SO Japanese collaborators, have been fabricating the optics tube which contains the optical lenses of the SAT instrument. The first optics tube is near completion and will be integrated with the SAT receiver in the near future. The second and third optics tube fabrication has also started in Japan. The fabrication of the SAT platform and shields, that reduce stray light systematics, has also been proceeding.The SO Japanese collaborator meetings have also taken place regularly throughout the fiscal year. We have organized four quarterly face-to-face meetings within Japan in the 2019 fiscal year, and participated in a full (world-wide) collaboration meeting which took place in the USA. The SO Japanese collaborators have been regularly presenting and updating on the SO development progress at the bi-annual JPS and ASJ conferences in Japan.The planning for the next generation CMB-S4 experiment, which will start instrument development in the 2020s, has started. Some of the SO Japanese collaborators are also part of the CMB-S4 R&D team, and we have been working on the reference design concept of the next generation small aperture telescope array. A world-wide CMB-S4 collaboration meeting was also held in the 2019 fiscal year in the USA.