Yuefan and Yuhang

According to Yuhang, the beam splitter after the Faraday, which is also at the bottom of the periscope was changed later last week after all the mirrors were installed. The beam doesn't seem so well aligned on the mirrors anymore.

So we tried to align again everything today, and at the same time we increase the beam height to around 224.5mm, to match the height of the quadrant on the breadboard.

During the alignment, we lost the green reflection very frequently, and at the last try when we want to install the second lens on the breadboard, the reflection beam became really low. Then we checked the end camera, half of the beam are out of the screen, and we could not use only the BS pitch local control to recover the beam height, but the PR pitch is saturating with zero corrections.