Sun 12:34:27 PDT Power Glitch

We had a power glitch yesterday, Sunday 27jul2025 at 12:34:27 PDT. It was detected by the MSR UPS, but not by any other UPS. Attached plot shows the CS Mains Mon at this time. No reports of any issues arising from this glitch, H1 was in lock throughout.

Note, the MSR UPS sytem time is about 13 minutes fast, it reported this glitch as 12:47:13.

OPS Day Shift Start

TITLE: 07/28 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 153Mpc
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 5mph Gusts, 2mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.04 μm/s
QUICK SUMMARY:

IFO is in NLN and OBSERVING as of 04:28 UTC. Planned comissioning will take place from 08:30 PT to 11:30 PT.

We dropped out of OBSERVING for 5 minutes due to the squeezer re-locking from 14:18 to 14:23 UTC.

Sun EVE Ops Summary

TITLE: 07/28 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 155Mpc
INCOMING OPERATOR: Oli
SHIFT SUMMARY:

Rode through a surprisingly "big" M5 Iceland EQ which was seen on SUS PRM, and seismometers, only to have a random lockloss 3hrs later.
LOG:

• 0010 EX saturation (on Verbal) corresponding with seismic motion which is probably a M5.0 Iceland EQ
• 0313 LOCKLOSS, with ALSy having difficulties, but some ETM tweaks and a couple of SCAN Aligns it made it.  DRMI looked ugly as per usual, so went to CMFringes + PRMI and DRMI locked up (with a click on SRM.  Back to Observing at 0428utc.

Sun EVE Ops Transition

TITLE: 07/27 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 151Mpc
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 25mph Gusts, 16mph 3min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.05 μm/s
QUICK SUMMARY:

Ibrahim's handing over an H1 locked for 8.5hrs, and environmentally the only notable are the winds now and we just survived a M5.4 Aleutian Islands/Alaska EQ.

OPS Day Shift Summary

TITLE: 07/27 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 151Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY:

IFO is in NLN and OBSERVING as of 15:07 UTC

We have been locked all shift, aquiring lock at the very beginning.

We're currently successfully riding through a 5.3 EQ from Alaska.

Nothing else of note.

LOG:

 

Sun CP1 Fill

Sun Jul 27 10:09:18 2025 INFO: Fill completed in 9min 14secs

 

OPS Day Shift Start

TITLE: 07/27 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 3mph Gusts, 0mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.05 μm/s
QUICK SUMMARY:

IFO is LOCKING at PREP_DC_READOUT_TRANSITION

Came in and it seemed that IFO lost lock at 13L39 UTC (about an hour before shift, but managed to automatically makle it back past DRMI.

 

Sat EVE Ops Summary

TITLE: 07/27 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 155Mpc
INCOMING OPERATOR: Oli
SHIFT SUMMARY:

Smooth shift with one lockloss.  Did not get the opportunity to run a calibration tonight (perhaps tomorrow w/ coordinated down time with L1 or do it when L1 is down?)
LOG:

• 0152 LOCKLOSS (w/ no tags).
  • 0317 Back to Observing (no initial alignment)

Mid-Shift Status

H1 just had a lockloss after a 6.25hr lock (no obvious culprits for the lockloss).  After PRMI, DRMI flashes didn't look great; so selected CHECK MICH FRINGES + prmi and DRMI locked up.  There will be no Calibration this shift.

Sat EVE Ops Transition

TITLE: 07/27 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 155Mpc
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 15mph Gusts, 8mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.05 μm/s
QUICK SUMMARY:

H1 has been locked 3.5+hrs.  Environmetnally, pretty quiet after the big afternoon EQ; winds are dropping, µSeism is low (touching the bottom of the screen!).

There is a question of To Run Or Not Run a calibration.  H1 is now thermalized (and a recent Short GRB standdown time Ibrahim had has expired).  Reached out to LLO, but I'm guessing they are on Autopilot for the night.  Ibrahim through out the idea of a calibration, and I think we'll just keep an eye on L1---if they lose lock, will run one.  (Or we can wait to coordinate a Calibration tomorrow.)

OPS Day Shift Summary

TITLE: 07/26 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 153Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY:

IFO is in NLN and OBSERVING 19:53 UTC (4 hr lock!)

IFO was very well behaved (2 days in a row!). Fully auto locks. Lost lock once due to a 6.6 EQ but managed to recover NLN within 2.5 hours. Lockloss alog 85997.

LOG:

None

Lockloss 17:26

Earthquake cause Lockloss ending 20hr 45 minute lock. It was a 6.6 EQ from NZ.

Fri Ops Eve Summary

TITLE: 07/25 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 152Mpc
INCOMING OPERATOR: Oli
SHIFT SUMMARY:

H1 was locked the entire shift even with the winds which topped around 35mph.  H1's been locked just over 8.25hrs.
LOG:

• 2340 Erik brought back the PIMON window on nuc25 (it had died earlier this week and CDS has been monitoring and will see how it does for the next lockloss).
• 0040-0120 Fire was spotted to the north, across the Columbia, and beyond the White Bluffs (Tony & then Jennie notified the Control Room as they were leaving site).  Richard & Mike were notified via text.

Sat CP1 Fill

Sat Jul 26 10:10:12 2025 INFO: Fill completed in 10min 8secs

 

OPS Day Shift Start

TITLE: 07/26 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 153Mpc
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 10mph Gusts, 5mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.04 μm/s
QUICK SUMMARY:

IFO is in NLN and OBSERVING since Jul 25 20:44 UTC (18 hr lock!)

IFO is still locked from yesterday, with consistent range.

Some of the non-stationary features in DARM

As part of the DQ shift, I was looking at the DARM spectrorams to identify non-stationary (of the order of hours) features. Below is a list of features that were relatively obvious from the spectrograms. I used GDS-CALIB_STRAIN_NOLINES channel data for July, 21, 2025. In order to see the frequency variations a bit clear, i used 100-second spectrograms.

• 17.8 Hz, wandering line with variation around 0.2 Hz
• 20.26 Hz with linewidth/variation of ~ 0.04 Hz 
  • This was also reported in the a-log 85856 recently. In addition to the narrow line, sometimes we also see ~1 Hz broad noise around the narrow line. It is not clear whether thest two features (narrow and broad) are related.  
• 25.6 Hz with ~0.2 Hz wander
• 27.1 Hz with ~0.1 Hz wander
• 33.0 Hz with ~0.2 Hz wander
• 40.1 Hz with linewidth/variation of ~ 0.02 Hz
  • Is this a harmonic of 20.26? Their temporal behaviour look similar. 
  • The bruco results show that most of the low frequency features listed above including 20.26 Hz come from the input part of the IFO such as HAM2-3, IMC, which was also reported in the a-log 85959. Further studies required to identify the exact coupling location and the mechanism.
• 126.24 Hz with linewidth/variation of ~ 0.02 Hz
• 136.36 Hz with linewidth/variation of ~ 0.02 Hz
• 151.48 Hz with linewidth/variation of ~ 0.02 Hz
  • All the three lines (126.24 Hz, 136.36 Hz, and 151.48 Hz) look similar in their variations over time and looking at the time scales the variations may be related to temperature; not sure if the source is the same for all three frequencies.
• 177.1 Hz with variation of 0.2 Hz
• 179.1 Hz with variation of 0.1 Hz
  • The temporal variations of 177.1 Hz and 179.1 Hz look similar. 
• 272.65 Hz with 0.2 Hz variation
  • Its variation looks similar to 126.24 Hz, 136.36 Hz, and 151.48 Hz (the frequency is very close to the next harmonic of 136.36 Hz)
• 540 Hz with 0.5 Hz width; excess noise at the beginning of the lock (input jitter?)
• 660 Hz with 1 Hz width; excess noise at the beginning of the lock (input jitter?)
  • We see something similar in LLO (alog 77265)also.
• 3073 Hz with ~2 Hz frequency ring down
• 3131 Hz with ~2 Hz frequency ring down
  • The 3073 Hz and 3131 Hz features look similar (the frequency of the feature decreases over time after the lock). Maybe down conversion of HOMs?
• 6556.8 Hz with 0.02 Hz variation
  • This one looks a bit different from 3131 Hz and 3073 Hz. It has more stable slope and small frequency variation. Maybe this is also realted to HOM, but one with high Q?