KAGRA Logbook

Continuous work to find the good alignment for ETMX.

Tweak the PR3 pitch to maximize the TMSX GR PD (From the TCam image, the yaw direction would be enough good)

Tweak the ETMX MN optic align with checking the PCal X RX PD value.
From the previous TCam photo session (~25 days ago), the PCal X RX PD value was about 0.9 (W?) in RX PD
(The reason why we choose the TCam photo session is that the we took pictures with lower pcal output)
By tweaking the Yaw direction, the center value to maximize the PCal RX PD was about 9.0 (almost zero)
But I cannot find the peak value for pitch direction, since the optic align value for better PD value was more than 1,000.
If we can add more power to MN actuator, we may find the GR beam on the IMTX, I think.
Moving mass can move not only the pitch direction, but also yaw direction a lot, so we want to tweak the ETMX alignment with MN actuator.

So, my suggestion of next step is removing the register from MN coil driver and increase the actuation gain.
(I want to ask someone in the morning, and after removing the register, I started the initial alignment as soon as possible and if possible, we want to measure the Finesse soon)
Now, we can see the PCal beam in PCal X RX PD, so just a tweak of pitch direction may find the ETMX good alignment.

Fortunate thing, we can see the GRY flash even after one day passed from yesterday initial alignment work, so the drift of the ITMY and ETMY would be small in current situation.