NAOJ GW Elog Logbook 3.2
Displaying report 1-1 of 1.
MarcEisenmann - 16:37, Thursday 10 August 2023 (3311)
spare ETMY measurement started
[Aso, Marc, Michael, Rishabh]
We installed spare ETMY with ears up (ie reversed top/down with respect to KAGRA installation) on the translation stage.
It helped a lot to remove the front top right metal support looking from the laser side for the installation.
After small realignment of the 2 photodetectors I checked the mirror center by trying to find the position where the signals drop to 0 (ie edge of the mirror).
X_center = 393.5 mm and Y_center = 155.5 mm.
Then I started measurement with Spol at the input (HWP = 351.2 deg) with maximum AC and DC dynamic range (1V) to take map over 70 mm radius with 1 mm step.
I'll keep these settings during holydays to avoid saturation.
The measurement seems to go fine and is mostly finished.
However, because of the new failure of air conditioning the temperature and humidity increased quite a lot in TAMA.
It's about 30deg in main building and quite more inside clean room.
just for safety I turned off PCI laser.