Two Types of Symptoms For Locking Locklosses During This Shift Before Alignment:
- PR Gain noisy from CARM_OFFSET_REDUCTION all the way to ENGAGE_ASC_FOR_FULL_IFO (example Attachment #1)
- Ringing up of PR GAIN & POP18 from ENGAGE_ASC_FOR_FULL_IFO to DARM_TO_DC_READOUT (example Attachment #2)
Something was not happy in ASC land!
LOCKING NOTES:
3:14 Lockloss
- Attempt#1:
- DRMI didn't lock after 10min so moved to PRMI
- Got up to CARM_OFFSET_REDUCTION (where it looks like PR Gain was really noisy/ringing up) and then = LOCKLOSS
- Attempt #2:
- Got up to RESONANCE, but PR gain still looked ugly = LOCKLOSS
- Attempt #3:
- Hung out at OFFLOAD DRMI ASC a few minutes
- Got up to PREP_DC_READOUT_TRANSITION and the PR GAIN & POP18 started to ring up like what happened for the lockloss from TJ's lock he handed off == LOCKLOSS
- 4:38 Initial Alignment
- INIT_ALIGN took over, but needed me manual tweaks for ALSx alignment
- This time MICH BRIGHT OFFLOADED worked for me & INIT_ALIGN finished off the alignment on its own.
- 5:10 Attempt #4 (post alignment)
- After the alignment, PR_GAIN (& POP18) looked much better...they have their noisy spots, but they weren't as bad as those earlier attempts.
- 5:54 Made it all the way to NLN! (w/ no pauses or issues)
New SDF Diff for PRM: This had to do with Binary IO (BIO) State Request (for Acquire & Low Pass) for PRM.
These were a new set of DIFFS which I had not seen before. I called Keita first (but I woke him up!), and then talked with Georgia. She was familiar with the issue. She mentioned since these were on the M2 stage they are not an issue for us at NOMINAL LOW NOISE since we do not have signals for the M2 coils. So in the interest of returning to OBSERVING & since this won't affect NLN/Observing, screenshot the channels/diffs, and all windows related to this (See Attachment #3, which shows channels with diffs, and all PRM medm windows involved).
Will need to trend these channels and/or go through guardian scripts to see what State Request we normally have for PRM, but I'll leave this for others. Will want to see what happens for the next lock!
6:15 Back to OBSERVING!
