[Ryan S, Corey, Camilla, TJ, Elenna]

Quick, must be fixed ASAP summary: something is wrong with ALS Y. The WFS are not engaging when they should. DOF2 seems to be bad right now, and the camera offsets are also not good. Guardian does not notice the WFS are not engaging. Do not trust the green camera offsets on the Y arm.

Ryan S brought the IFO to DC readout successfully, and began damping violin modes. Some noisy peaks are evident, probably due to pumps that are still running and/or the HAM5/7 relay tube gate valve is still closed.

I set SRC1 P and Y offsets and engaged the loops. SRC1 P offset = -0.538 and SRC1 Y offset = 1.327

These offsets keep us in a good place for the SRM, and then I can walk SR2 to converge the SRC2 loop.

This worked for pitch, and I was just about to engage SRC2 pitch when there was a lockloss due to HAM6 motion. Both the vacuum team and Camilla and TJ were around that area for various activities, potentially causing the lockloss.

After TJ and Camilla aligned the OMC trans camera, we ran initial alignment (trying to lock DRMI failed because the alignment was very poor).

Initial alignment failure:

• we tried to run a full initial alignment with the new green camera offsets, but it failed
• ALS locks successfully for both arms, and the X arm completes "initial alignment offloaded"
• However, the Y arm gets stuck in the "initial alignment" state and the WFS do not turn on
• We found a button that can "force" turn them on, but the alignment pulls the Y arm in a bad direction
• We tried this a few times, turning off various alignment loops to pinpoint which ones were bad
• it appears that dof2 and the camera loops are not good
• I don't know if there is some other issue I am missing, but it doesn't seem like the camera offsets are in the right place (even though they should be from earlier!)
• We couldn't figure out why the ALS guardian would just hang in "initial alignment" either, waiting for the WFS to converge when it wasn't even engaging the WFS. Ryan hypothesized it was a "beckhoff issue"

I had us give up and run a manual initial alignment without using the green cameras.

It appears that even in "Locked slow wfs" the ALS Y WFS do not turn on, but it's somehow not a problem in the guardian because the error signals are pretty well converged already? Something is going wrong with the ALS Y WFS. Trending back it seems that the ALS Y WFS did not run at all today, and we didn't seem to notice!

In order to properly run the WFS, I have to take the ALS Y guardian to "locked slow ETM TMS WFS" and then "force" the autocentering trigger in order to turn on the WFS. Then I can let the guardian move on to offloading.

Additionally, ALS Y DOF 2 is taking the Y arm in a bad direction again after it converges the alignment in green locking. Once I force on the Y arm WFS, I turn off the DOF2 signals and that keeps the Y arm stable through the next locking steps.

To get the SRC ASC on:

• Corey and I went to "prep asc for full ifo"
• I stepped through by hand, skipping the SRC ASC steps
• I set offsets in SRC1 at about -0.5 for pitch and 1.4 for yaw.
• I engaged the SRC1 loops successfully with the offsets on
• I stepped SR2 in pitch and yaw to converge the SRC2 error signal and keep the buildups good
• I engaged SRC2
• I turned on soft loops, corner alignment got worse (POP18 dropped, POP90 increased)
• to improve the POP buildups, I then slowly stepped the SRC1 offsets to zero, which improved the alignment (and SR2 and other optics could follow!)
• These offsets are SDFed for now, but should be turned off once we know the alignment is "saved" properly otherwise

Indeed now that we are in full good alignment with ASC engaged, the ALS Y green is no longer locked on a 00 mode, which means that the camera offsets from earlier are maybe incorrect. However, I could not get the ALS Y to lock on the 00 beam in order to reset the offsets. First, I tried moving the green QPD offset sliders around, then I tried very slowly moving the TMS in 0.1 urad steps. All I can get on the camera is this.

However, I did another set of the ALS X green references (very minor change), with the SDF screenshot attached. The ITMX CAM values were still good, so I didn't change them.

Everything else executed well: power up, low noise transitions. I skipped over "inject squeezing" since we don't have the valves open for the FC yet. We have arrived in OMC whitening, where the guardian is holding us to damp the violins.

DARM is very noisy, probably due to whatever vacuum pumps are still running and any extra noise due to the relay tube being closed. Most calibration lines have no SNR due to the high noise.

Major problem to solve is the ALS Y alignment and camera offsets, but locking has succeeded and we are almost back to nominal!