[Marc, Hirata, Sato, Takahashi]

This morning we opened PR chamber to take measurement of the in-vacuum Faraday Isolator. Indeed, the base plate has to be modified to be compatible with the new rotator.

Sato-san took precise measurements but it is something like 80mm along the beam direction and 90 mm in the transverse direction. In addition, we might have to move output polarizer holder. We have about 5 mm margin left and right (screw is at the center of the range) and the holder base is 25 mm from the edge of the FI baseplate towards the squeezer bench.

Also, because the BS oplevs are again giving strange signals, I realigned the green beam into the filter cavity before closing the chamber.

Moving PR I centered the beam on BS gate valve and got the beam on the first target (usual top-left of the hole). Then, I move both PR and BS to maintain the beam on the first target while recovering mostly the PR target.

Finally, I moved BS to get the beam on the 2nd target. At this position, I could confirm that both PR and BS coils actuators are working as expected.

The vacuum is now on-going.