R&D (FilterCavity)
NaokiAritomi - 19:36, Thursday 12 May 2022 (2940)
Recovery of FC

[Aritomi, Michael]

We found that one of the green references at PR chamber was not aligned as shown in Fig. 1, which means we need to align the green injection beam. We removed the cover of the optical bench and aligned the green injection beam as shown in Fig. 2.

Then we aligned PR to make the green beam at the center of GV between BS/input. However, in this situation, the green beam at PR reference in BS chamber is clipped by a mirror behind the BS as shown in Fig. 3,4.

Images attached to this report
2940_20220512123618_fig1.jpg 2940_20220512123627_fig2.jpg 2940_20220512123632_fig3.jpg 2940_20220512123639_fig4.jpg
Comments related to this report
NaokiAritomi - 17:56, Friday 13 May 2022 (2942)

Since the beam spot at GV between BS/input depends on both PR and BS, we should align PR and BS at the same time by using the GV between BS/input and the first target as references.