TITLE: 05/02 Owl Shift: 07:00-15:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Lock Acquisition
INCOMING OPERATOR: TJ
SHIFT SUMMARY:
130-sec-period ASC yaw oscillation continues. Attaching ASC ndscope (template from "Locking" medm) which shows the oscillation seen on ASC PRC1 and noisiness seen on ASC DC1 & 2 (which don't quite line up with each other). This has probably already been looked at, but just posting for kicks.
ALSx & y are no longer on DIAG_MAIN (see earlier alog).
Temperature issues observed at mid stations and EY (Bubba notified and commented on my entry).
LOG:
- 7:15-7:26 Remotely reducing als X&Y fiber polarization
- 7:37 Return to Locking
- IR Not Found on first attempt.
- PRMI was a bit off, but once locked (I tweaked BS in yaw a couple of clicks to help lock) took POP90 up to 73 (from the paltry 40s it was at)
- Minor tweaking of PRM & SRM at OFFLOAD_DRMI_ASC to minimize POP90 & maximize POP18.
- 8:29 Made it to NLN w/ no issues.
- Had a high-precision SDF diff for PSLISS (channel H1:PSL-ISS_REFSIGNAL)----> ACCEPTED it.
- 8:32 OBSERVING
- 9:50 begin to see 3min oscillations in ASC/LSC signals.
- 12:06 FMCS LOW Temp Alarm at MX
- 14:54 Lockloss (Just in time for TJ!)
- 14:59 With the lockloss, took opportunity to address the getting the CW injection back (Dave).
Here's a few interesting things I found for the lock loss:
1st attachment - Doesn't show any signs of struggle really.
2nd attachment - Bit of a glitch right before the lock loss?
On the lock loss page there are a few signals that are looking suspect a few seconds before the lock loss (IMC WFS, LCS_REFL_A_LF, more), but nothing that I can make a inference about.
