Craig, Georgia

CARM
We've been having loads of CARM locklosses recently while we are transitioning to resonance.  The locklosses are occurring at or just after CARM_TO_REFL, where we transition from TR_CARM to REFLAIR9.  Since we are sitting at 5 picometers CARM offset when we make this transition, REFLAIR9 is very noisy, but we move to RESONANCE immediately after.  I measured the TF between TR_CARM and REFLAIR9 and increased the sensing matrix element for REFLAIR9 from 2 to 3, and increased the REFLBIAS gain from 50 to 86.  We have made it through this transition every time now, but the PR_GAIN number on the striptool still spikes, meaning the POP_LF power changes rapidly through this transition, which is probably bad.

ASC
CHARD
We tried increasing the CHARD gain a couple of times to find the thresholds of instability at 2 watts.  Our measurements of CHARD suggest we should be able to increase the gain from 0.3 to 3 for both loops, but this has not been the case.
We turned off all the vertex loops and the SOFT loops to remove as much cross-coupling as possible, leaving on only DHARD and CHARD.  We then increased the CHARD gains:
CHARD_Y was stable at 2, but not 3.
CHARD_P was stable at 1, but not 2.
We then tried reengaging the vertex degrees of freedom.  We got through PRC1, INP1, SR1, but lost lock when reengaging SRC2.  Should have reengaged MICH first :/

DSOFT vs SRC
We had at least three locklosses tonight when reaching ENGAGE_SOFT_LOOPS.  In particular, we found that DSOFT Y is strongly coupled with SRC1 Y and SRC2 Y, and when engaged with the new higher gain (5, old gain was 0.5) we'd lose lock. (Pic 1)  We are able to engage them with high gain by hand.
We increased the ENGAGE_SRC_ASC convergence waiting time to a minute, and lowered the gain for both DSOFT loops in the guardian so we won't lose lock here, but we can handle more gain once DSOFT has converged.

Higher Power
We are able to stably sit at 7 watts input power, times in plot 2.  We were here for over an hour while I fumbled around trying to take a CHARD P measurement.  I was unable to do so: any amount of coherence achieved also caused the interferometer to be unstable.