Sheila, TJ, Oli, Matt

We reverted the ASC gain changes (87582) setting INP1 P to 1 and CSOFT P to 25 at MAX power (rather than 30).  Most of our locklosses overnight were from states before Max power, so the CSOFT P gain can't have been the problem, but we are undoing it for now just for the sake of reverting recent changes. 

We looked at one of the overnight locklosses, it seems that MICH is ringing up at 4.7 Hz.  Since Oli is sitting at 2W DCreadout to damp violin modes, we measured the MICH OLG there, and we see it is pretty close to unstable at 5Hz, with low coherence there.  We added a factor of 2 gain in LSC MICH2, to bring the UGF to 10 Hz similar to the references, and give us 35 degrees phase margin. 

Next we checked the SRCL UGF, which is also locked on POP45, and it's gain looks low by a factor of 5 compared to the reference.  This loop has a large phase bubble so it's still stable. POP 45 whitening gain and filters seem to be the same as a few days ago, and the POP LF power is the same as it was a few days ago at 2W.  PRCL gain also looks low compared to the reference, but is stable.  

We were able to get to OMC_WHITENING (almost to low noise), but while we were sitting there we had the old ring up.  We tried manually increasing the CSOFT P gain to 30, but the osciallation had already grown large and we lost lock anyway.  I've now put the csoft P gain back to 30 in max power in the guardian.