I tried Elenna's FM6 from 80287, this made the PRCL coupled noise worse, see first attached plot. 

Then Ryan turned off CAL lines and we retook to preshaping (PRCLFF_excitation_ETMYpum.xml) and PRCL injection (PRCL_excitation.xml) templates.  I took the PRCL_excitation.xml injection with the PRCL FF off and increased amplitude from 0.02 to 0.05 to increase coherence over 50Hz. Exported as prclff_coherence/tf.txt, and prcl_coherence/tf_FFoff.txt. All in /opt/rtcds/userapps/release/lsc/h1/scripts/feedforward

Mon Sep 30 08:11:07 2024 INFO: Fill completed in 11min 3secs

Jordan confirmed a good fill curbside.

Because of cold outside temps (8C, 46F) the TCs only just cleared the -130C trip. I have increased the trip temps to -110C, the early-winter setting.

I don't consider this a full investigative report into why we've been having these FSS_OSCILLATION tagged locklosses, but here are some of my quick initial findings:

• FSS_OSCILLATION tags are just glitches over the tag threshold in the lockloss tool that happen with high frequency at a lockloss; not actual oscillations
• When glitches happen, drive to the FSS EOM (H1:PSL-FSS_PC_MON_OUTPUT) rises. Frequent glitches cause the drive to keep rising (see 7min screenshot)
• Glitches are (probably) too fast to be responses of suspensions moving and changing cavity length
  • SUS not seen moving during these times
• Glitches happen while locked, although usually with lower frequency (see screenshot)
• Sometimes after lockloss, glitches can persist and cause actual oscillations, delaying IMC (and IFO) relocking time as the FSS is not ready, see screenshot from last week
• Non FSS_OSCILLATION tagged lockloss example: see screenshot

Please feel free to add comments of anything else anyone finds.

TITLE: 09/30 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 146Mpc
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 4mph Gusts, 2mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.13 μm/s
QUICK SUMMARY: H1 has been locked and observing for almost 4 hours. One lockloss overnight, which doesn't have an obvious cause but looks to have a sizeable ETMX glitch. Commissioning time is scheduled today from 15:30 to 18:30 UTC.

• Wind and microseism low
• All other systems nominal

TITLE: 09/30 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Reacquisition
INCOMING OPERATOR: Ryan C
SHIFT SUMMARY: Trying to relock and at LOCKING_ALS. Relocking from the previous lockloss wasn't too bad so hopefully this relocking goes smoothly as well. We had superevent candidate S240930aa during my shift!
LOG:

23:00UTC Observing and have been Locked for 2 hours

23:32 Lockloss
    00:09 Started an initial alignment after cycling through CHECK_MICH_FRINGES
    00:47 Initial alignment done, relocking
01:28 NOMINAL_LOW_NOISE
01:32 Observing

04:00 Superevent S240930aa

04:54 Lockloss

Lockloss @ 09/30 04:54UTC

We went out of Observing at 04:53:56, and then lost lock four seconds later at 04:54:01.

TITLE: 09/29 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
INCOMING OPERATOR: Oli
SHIFT SUMMARY: H1 was locked this morning until winds picked up, which kept it down through midday. Was able to get relocked this afternoon, but we just had another lockloss as I'm drafting this log.

• 14:30 - H1 relocking, up to MOVE_SPOTS
• 14:48 - Observing
• 16:51 - Lockloss - alog80354
  • Waiting for high winds to calm
• 21:09 - Observing
• 23:32 - Lockloss

LOG:

Lockloss @ 09/29 23:32UTC. Ryan S and I had been watching the FSS channels glitching but Ryan closed them literally seconds before the lockloss happened so not sure yet if it was the FSS but we think it might've been. Wind is also above 30mph and increasing so could've been that too

TITLE: 09/29 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 148Mpc
OUTGOING OPERATOR: Ryan S
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 27mph Gusts, 16mph 3min avg
    Primary useism: 0.10 μm/s
    Secondary useism: 0.15 μm/s
QUICK SUMMARY:

Observing at 150Mpc and have been Locked for 2 hours. Winds are still above 25mph but microseism is getting lower.

Since the lockloss at earlier this morning, high winds up to 40mph have made locking H1 problematic; on occasion we can lock DRMI, but rarely. Unfortunately, the forecast says these winds will stick around for most of today.

Lockloss @ 16:51 UTC - link to lockloss tool

Cause looks to me to be from high winds; gusts just hit up to 40mph and suspensions were moving right before the lockloss in a familiar way.

Sun Sep 29 08:11:15 2024 INFO: Fill completed in 11min 11secs

TITLE: 09/29 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 17mph Gusts, 10mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.16 μm/s
QUICK SUMMARY: H1 appears to have unlocked around an hour ago and is currently relocking up to INJECT_SQUEEZING. Four locklosses in total overnight; I'll start looking into them shortly.

• Winds slighty elevated, microseism still trending down
• DIAG_MAIN still reports the CO2Y laser power is low

TITLE: 09/29 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 153Mpc
INCOMING OPERATOR: Ryan C
SHIFT SUMMARY: Observing at 155Mpc and have been Locked for 9 hours. We've been Locked my entire shift so it's been a quiet evening. Didn't get a chance to take today's calibration measurements because Virgo and Livingston stayed nice and locked.
LOG:

23:00 Observing and have been Locked for 3 hours

Closes FAMIS#26447, last checked 79824

Driftmon plots, auxiliary plots

Everything is looking good. BRSX is close-ish to the lower threshold after the latest picomotor move (80269) but looks to be staying level.

First spike on BRSX plot is pico work from September 19th (80183)
Second spike on BRSX plot is pico work from September 24th (80269)

Observing at 150Mpc and have been Locked for 7 hours now. It's been a quiet evening.