[Oshino, Tanaka, Yamamoto, Yokozawa, Ushiba]

Abstract:

We performed fine XARM alignment with ADSs.
After the alignment, IR transmission becomes 1, which is same as before the earthquake.

Detail:

We performed initial alignment of XARM.
Procedure is basically same as written in the initial alignment documents, though there are some manual works due to the restriction of current suspension conditions.

Figure 1 shows the XARM ndscope just before finishing the alignment.
Normalized IR transmission is almost 1, which is same as before the Noto earthquake, good.
Normalized GR transmission is 0.95, so we need to align GRX tot he current good XARM by using PICO motors on POP table.

Figure 2 shows the POP FORWARD QPD signals during the XARM alignment.
Beam hits close to their centers, so beam spot on PR2 should not be changed so much.

Note:

During the alignment, we noticed LOCK_ACQUISITION state for PR2 and PR3 is no more working.
So, we need OpLev centering and optimization of suspension controls.