[Miyo, Iwata, Kokeyama, Kawamura, Aso, Michimura]

We have re-adjusted the BS alignment so that the beam get through the window on the gate valve between IYA and Yarm.
Now the beam go through the gate valve windows with the offsets from the center as follows.

GVbsy: +15 mm in X, 10 mm down (+/- 8 mm by Kokeyama-san's eyeballs)
 DESIGNED:  +8 mm in X, no offset in up/down
IYA-Yarm GV: +20 mm in X, 0 mm up/down (+/- 10 mm by my eyeballs)
 DESIGNED: +16 mm in X, no offset in up/down

IYA clean booth preparation:
[Saito, Nakano(U-Toyama), Tomaru, Miyoki, Iwata, Michimura]
 First of all, we have prepared the IYA clean booth. We have wiped the IYA tank, ducts near by, and the floor. After wiping, metal sheets are placed on the floor. Some clean goods (including a table and a hanger rack) are also prepared.

What we did:
 1. Moved the BS suspension in yaw with pushing jigs and in pitch with picomotors so that the beam get through the window on GVbsy (the gate valve between BS and IYC chambers).

 2. At this point the beam was hitting on the duct between IYC and IYA. So, we moved the BS suspension further more in yaw so that the beam shifts in -Y direction.

 3. We further adjusted the BS suspension alignment with pushing jigs and picomotors to get the beam through the window on the GV between IYA and Yarm.

 4. As a result, we get the beam go through both gate valve windows with the offsets shown above. The photo of the IR card at IYA is attached. It clearly show circular shape with clipping at four corners because of the earthquake stop.

Next:
 We think current alignment is pretty good (within ~0.3 mrad). The distance from the BS mirror to the GVbsy is 4.1 m, and the distance to the IYA-Yarm GV is 61 m.
 We will sweep BS to find Y arm optical axis (we forgot to center the BS oplev after re-adjustment; we will tomorrow).
 We may have to shift the beam by -7 mm or so in X by shifting the BS position.