First, I requested the ALIGNED state to SR2 and SR3 and tweak the SR3 for good alignment (using TCam) Fig.1.
P : 27 -> 0
Y : -106 -> -100
Then, I requested the ISOLATED state to ETMY, but we could not find the TM oplev light at this state.
I tweaked the MN oplev in the range from -10,000 to 10,000, but I could not find the TM oplev light.
I gave up the alignment work today.
I found the ETMY OpLev beam on the QPDs by tweeking ETMY suspension.
For offloading MN OPTICALIGN OFFSET, I chenged BFY setpoint and moved CRY stepper motor.
Now, OpLev beam should be on the QPDs when ETMY is ISOLATED state without MN OPTICALIGN OFFSET (fig1).
1. Set the aligned state SR2 and SR3 mirror.
Fig.1. showed the ETMY TCam image when setting the aligned state for SR2 and SR3
2. Set the aligned state ETMY
But when I requested the ALIGNED state to ETMY, the large oscillation happened, so I requested the DAMPED state and aligned manually using the MN optic align.
Fig.2. showed the ITMY TCam image when setting the damped state and manual alignment for ETMY.
3. Tweak the ETMY by maximum the ALS REFL PD.
P : 20.4 -> 17.0
Y : 19.7 -> -12.0
4. Set the aligned state ITMY
5. Tweak the ITMY by maximum the ALS REFL PD.
P : 24.0 -> -20
Y : -16 -> -55
ITMY TM oplev also excellent!
6. Fluctuate both ETMY and ITMY and tried to find the GRY flash
Fig.3. showed the image when GRY like signal found.
The final TM WIT values are
ITMY P : -29.0
ITMY Y : -56.0
ETMY P : 19.0 (MN OPTICALIGN -320)
ETMY Y : -18.0 (MN OPTICALIGN 25)
