corey.gray@LIGO.ORG - posted 08:01, Saturday 25 February 2017 (34396)
OWL Operator Summary
TITLE: 02/25 Owl Shift: 08:00-16:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Corrective Maintenance
INCOMING OPERATOR: Ed
SHIFT SUMMARY:
PSL trip at the beginning of the shift made for a tough first half of the shift. This was followed by a random & mysterious lockloss. Other than that, shift ended quietly with double coincidence.
LOG:
- 8:34 - 11:44 H1 Lockloss due to PSL Trip
- Needed tweaks: ETMx (via ALS), quite a bit for BS (via check mich fringes) & BS/PRM (via PRMI lock)
- 12:59 - 13:41 Lockloss (nothing seismically; did have the FSS NoiseEater faulting, so made a quick trip to the PSL rack)
- Needed tweaks: ETMx (via ALS), BS (via check mich fringes) & BS/PRM (via PRMI lock)
- DHARD Ring Up: Had another instance of this, starting around ENGAGE SOFT LOOPS. I took the ASC WFS Gain from 1.0 down to about 0.8. After miraculously making it to LOWNOISE ASC, I slowly ramped back up to 1.0 (I thought I was going to have to break lock and start over again, but this luckily worked).
- SDF Diff accepted for ISS Ref Signal again (since I adjusted it to get the Diffracted Power to 3.5 after the Noise Eater toggle).
- 15:54 Diag Reset for h1iopasc0