Camilla, Jason, Sheila, Jenne

Looking at two short time periods where we've had lots of unknown lock losses, I have found that there seems to be a correlation with the time of the lockloss being within milliseconds of the PSL Ref Cav Transmitted photodiode and PSL PZT  oscillating (Yellow and green channels in attachment and zoomed version). I haven't fully investigated, but this seems to not happen when we know the reason of our lockloss, see EQ attachment for example when we lost lock from EQ and there is no FFS oscillation.

Times I have found: 2020-01-21 13:37:29 UTC, 2020-01-21 04:12:13 UTC, 2020-01-20 04:08:49 UTC, 2019-01-12 19:38:13  UTC, 2019-01-12 15:30:36  UTC, 2019-01-12 10:07:31  UTC, 2019-01-11 07:17:56  UTC,