Hang, Matt, Evan, Stefan, Rana
WE mostly were chasing weird locklosses and instabilities, but also managed to implement a few noise improvements:
Of the locklosses, some were just due to marginal points in the transitions and loop margins. The main issue over the past few days turned out to be that the TIDAL servo was turned OFF somehow on Friday evening. After switching that back on for ETMY, we have returned to having long locks. The highpassing of SRCLFF has removed the high power pitch instabilities that we were seeing.
We were able to get > 40 Mpc with 10W input. The butterfly mode of ETMY @ 6053.81 Hz is preventing us from turning on the OMC DC whitening right now, so we don't know how good our range really is, but our low frequency
We also got a change to reimplement a small amount of the ASC changes from before last maintenance day:
Next:
Note, Rana reports that the tidal was OFF at the far right switch on the IMC_F Filter Module (picture attached shows this switch now on as it should be).