We have had plenty of things wrong in the IFO since we used bad safe.snaps to restore after the power outage last wensday. (A2L gains, missing ASC notches, ETMY bias was accidentally flipped, plenty of dark offsets changed, some violin damping was on with the wrong filters engaged ect...)
This morning Jenne, Kiwamu and Evan helped me to clean this up so we are nearly back in the observe state from O1, with only intentional changes like the LSC feedforward and sending MICH to PR2, which we have accepted.
There are a few things remaining red:
The bias is flipped on ETMY, and the gain in L3 DRIVEALIGN_L2L (which compensates for the bias flip). It might be that we have messed up the calibration by doing this flip accidentally, but we were planning on doing it soon anyway.
I've also implemented a version of the scripts from LLO that load down.snaps in SDF when the IFO goes down, and observe.snaps when we reach nominal low noise. So far we only have saved a few down.snaps, but if we add more and keep them up to date this should be alot easier in the future since we won't need to be locked to see what differences we have.
After the IFO lost lock Jenne, Trais and I went through SDF and updated the downs that I had made last week after the power outage, and made down.snaps for the models that had differences from the observe state. I also added these the the bash scripts that the guardian uses to load sdf files.
We also flipped the bias on ETMY back.
This means that if we loose lock from nominal low noise, SDF should be all grey and green now. If we loose lock from a different state (like we just did during the CARM offset reduction) SDF will not be green.
Now if we can keep these up to date we can avoid this kind of trouble in the future. We probably need to think about how we are going to keep these up. Maybe it can be a weekly maintence task?
I have cleared the rest of the SDF diffs that we have for today in the Observe state.
For some reason, SR2's setpoint had the M2 Pit and Yaw inputs turned off. This isn't right, so I've accepted the correct state of having the inputs turned on so the signal can go through.
I have also accepted the gain of -1 in the PR2 ISCINF_L filter bank, which is used for the PRCL-MICH decoupling as of last week.
The last thing I accepted was a filter module turned on in the SRM's ISCINF bank that Gabriele created to try to get rid of the 3.2kHz broad peak in DARM that is very very coherent with SRCL.
We're still taking measurements right now, but SDF is green, so we should be able to leave the IFO in Observe when I'm done.