Related work with klog29504

[Aso, Hirata, Ushiba]

To confirm there is no beam clip at TMSX and ADSs should work well, we checked the TMSX optics.
Initially, IR beam is almost clipped at PD, so we checked the IR beam spot from upstream.

Since the beam is very large on the first lens and first mirror on TMS VIS, it is hard to say if the beam spot is centerd or not but it is unlikely clipping the beam.
On the second mirror, second lens, and the mirror after the second lens, bem spot is slightly shifted along +Y direction but it is also unlikely clipping the beam.
So, we concluded there seems no clipping inside the TMS chamber.

Then, we checked in-sir optics and found that beam on the RLNS1 (JGW-T1808962-v17) is shifted.
So, we moved RPM1 and RST2 so that beam is passing thorough almost the center of RLNS1 and RPD1.
Then, we finely centered the IR beam on RPD1 by using RBS3 and centered the beam to CCD camera by RST5.

After these alignment, we performed the X arm alignment with ADss but transmission power is still about 0.8 and no drastic alignment change was happened.
So, TMSX alignment doesn't seem the reason of low transmission power.
We need further investigation on the transmission power reduction from O4a