TITLE: 05/19 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 127Mpc
SHIFT SUMMARY:
IFO set to relock prior to my shift; NLN reached @ 15:02 and Observation Intent Bit set to OBSERVE @ 15:27
Lockloss @ 17:31 from PI mode 29 ringup. This is a mode we have not had success damping in the past, but recently has not been an issue. I went to lower the OMC whitening to give it some room, but I was too late.
Upon trying to relock, we discovered the ALS beatnotes were very poor (-16 COMM and -19 DIFF). After a discussion with Sheila and TJ, I ultimately moved PR3 by 1.6 µrad to see improvement in the beatnotes and reran initial alignment. Relocking after this went smoothly; NLN reached @ 19:38, Observing @ 20:02
We dropped Observing for about a minute at 20:28 from the CO2 X laser on ITMX losing lock and having to reacquire using the TCS_ITMX_CO2 guardian, creating SDF diffs. Before I could take a screenshot, the diffs cleared themselves and we were able to return to Observing.
LOG:
| Start Time | System | Name | Location | Lazer_Haz | Task | Time End |
|---|---|---|---|---|---|---|
| 13:19 | ifo | Jenne | home | n | locking | 15:28 |
| 16:31 | VAC | Janos. Jordan | MY | - | Picking up pump | 17:01 |
| 17:01 | VAC | Janos, Jordan | CP1 | - | Pumping CP1 | 17:42 |
| 17:45 | VAC | Janos, Gerardo | LVEA | - | Untrip breaker | 18:31 |
| 17:45 | PEM | Robert | EX | - | Troubleshoot magnetometer | 18:31 |
| 20:35 | FAC | Randy | EY | - | Pick up tool | 21:09 |
| 21:10 | PEM | Robert | EY | - | Troubleshoot chiller pumps | 21:52 |