[Aritomi, Yuhang]

After the evacuation of PR/BS chambers, we aligned PR/BS picomotors to center the PR reference and the first target. Then we checked the second target. Although we scanned BS alignment a lot, we could see only scattered light on the second target.

Instead of the nominal PR reference, we used the green beam position in the gate valve between BS/input chambers as PR reference (Fig.1). We centered the green beam in the gate valve between BS/input chambers by PR picomotor and centered the green beam at first target by BS picomotor. Then we found the green beam in the second target. Since the green beam position in the nominal PR reference changed, we made a new PR reference as Fig.2.