corey.gray@LIGO.ORG - posted 00:03, Thursday 23 November 2023 - last comment - 10:38, Tuesday 28 November 2023(74377)
Wed EVE Ops Summary
TITLE: 11/23 Eve Shift: 00:00-08:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 157Mpc
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY:
The last hour has shown a drops in range while being in OBSERVING. In the last 30min the range drops have been less severe, but this is an odd one.
Had a few bumps out of observing due to the squeezer, but it would only be for about ~2min as the squeezer relocked itself. L1 came back to Observing this shift.
LOG:
- Drops from OBSERVING due to the Squeezer unlocking this shift:
- 2356 - 2359 utc (end of Ryan C.'s shift)
- 0004 - 0006
- 0624 - 0626
- 0244 Short GRB alert
- 0712 Short GRB alert
- 0700 H1 range begins taking a hit with drops and variations. Have not received any alarms for this & have been in OBSERVING the whole time. Environmentally we look good at first glance.
The range fuzziness that started at 11/23 07:02UTC, also mentioned in 74387. From SQZ BLRMs can see that this is in the 80-140Hz region, plot attached. This is not related to SQZ unlock/relock as it was 45 minutes before. The SEI states didn't change at this time. Can't see anything in PEM channels in CS and Ends, plot attached. CS Fan5 appears to change it's readback around an hour after the range fuzziness started, plot attached.
Can see some change in FAN5 around the time the range fuzziness started this morning at 15:31UTC, plot attached.
Ryan C also did some investigation in 74383.
Fan5 seems fine: Eric helped me look into Fan5 and Air Hander 3 that is linked to this fan. This Fan is off but the channels will pick up air flow from other fans. The noise just seems to change on ~few hour period making it look suspiciously in time with DARM fuzziness starting. We see no significant changes in the last few weeks.
DARM while range fuzzy: As suggested by Robert, attached is DARM in two range dips during glitches (yellow at 07:02UTC, red at 08:35UTC) and green was more typical of what DARM looked like during this fuzzy time (DARM broadly increasing and decreasing in 20-200Hz region). I can see no obvious scattering arches but Robert suggested using the Q-transform tool of ldvwweb to check these glitches: Arianna did this in 74455.