Mayank, Sheila, Camilla

After the adjustments to the ADF SQZ phase servo 83381, we had some issues will it railing at the start of the lock, so it was turned off 83393.

Today Sheila re-cabled the phase at the SQZ racks so that we're now using RF3 rather than RF6. The expectation is that the ADF phases we set are changing with thermalization and RF3 should have the ADF I and Q signals centered on zero with no offsets.  The SQZ angle is still controlled via the same RF6 medm channels but its really adjusting the 3MHz.  

• Inital cabling (using RF6): 
  • 25-2 goes from 6 MHZ to CLF phase shifter
  • 30-2 goes from 3 MHz right to LO demod (with extra cable length)
  • 215 goes from phase shifter chain to CLF demod
• Final cabling (using RF3): 
  • 25-2 now goes from 6MHz to CLF demod
  • 30-2 now goes from 3MHz to phase shifter
  • 215 now goes from phase shifter chain to LO demod
• Photos attached

After this we turned off the H1:SQZ-ADF_OMC_TRANS_DEMOD_{I,Q}_OFFSET and put H1:SQZ-ADF_OMC_TRANS_Q_NORM back from 4.5 to 1. Then we scanned the SQZ angle with ezcastep H1:SQZ-CLF_REFL_RF6_PHASE_DELAYSTEP -s 15 '+74,28' and H1:SQZ-CLF_SERVO_IN2POL sign NEGATIVE to get a new data set to fit to. For good SQZ, CLF sign left at negative with SQZ angle at 185deg.

TITLE: 03/17 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 151Mpc
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 3mph Gusts, 2mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.25 μm/s
QUICK SUMMARY:

• We've been locked for almost 3 hours
• Low wind, secondary microseism is decreasing
• EX vac yellow alarm for EX_X2_PT524B_PRESS
• Optics lab seeing some dust counts, max of ~350

TITLE: 03/17 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 152Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY: Very quiet shift with H1 observing since getting relocked. Currently have been locked for 4.5 hours.

• 23:37 - Alignment finished, starting lock acquisition
• 00:30 - Observing

TITLE: 03/16 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY:

IFO is LOCKING in INITIAL_ALIGNMENT

An extremely calm shift in which H1 was locked for 9 hours today with one lockloss (cause yet known). Lockloss alog 83401.

I also ran a calibration sweep (alog 83397) since we didn't get to run one yesterday, testing out the new sweep script on the Calibration Measurement Wiki.

LOG:

Lockloss @ 23:06 UTC - link to lockloss tool

No obvious cause, and no real sign of an ETM glitch that I can see either. Starting an initial alignment now.

TITLE: 03/16 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 150Mpc
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 13mph Gusts, 7mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.41 μm/s
QUICK SUMMARY: H1 has been locked for 9 hours. Calibration sweep was run earlier today, but otherwise sounds like it's been quiet.

• Wind is low, microseism steady just below 95th percentile
• All other systems nominal

Closes FAMIS 26373. Last Checked in Alog 83229

Laser Status:
    NPRO output power is 1.845W
    AMP1 output power is 70.39W
    AMP2 output power is 140.3W
    NPRO watchdog is GREEN
    AMP1 watchdog is GREEN
    AMP2 watchdog is GREEN
    PDWD watchdog is GREEN

PMC:
    It has been locked 40 days, 2 hr 27 minutes
    Reflected power = 22.39W
    Transmitted power = 106.6W
    PowerSum = 129.0W

FSS:
    It has been locked for 0 days 9 hr and 26 min
    TPD[V] = 0.8039V

ISS:
    The diffracted power is around 3.5%
    Last saturation event was 0 days 10 hours and 2 minutes ago

Possible Issues: None reported

Calibration sweep was successful! Start and end times for each below (and calibration monitor attached). We are back in OBSERVING

Broadband:

Start: 1426179497

End: 1426179806

2025-03-16 10:03:08,401 bb measurement complete.
2025-03-16 10:03:08,401 bb output: /ligo/groups/cal/H1/measurements/PCALY2DARM_BB/PCALY2DARM_BB_20250316T165757Z.xml
2025-03-16 10:03:08,401 all measurements complete.

Simulines:

Start: 1426180040

End: 1426181443

It is SAFE TO RETURN TO OBSERVING now, whilst data is processed.
2025-03-16 17:29:49,489 | INFO | Commencing data processing.
2025-03-16 17:29:49,489 | INFO | Ending lockloss monitor. This is either due to having completed the measurement, and this functionality being terminated; or because the whole process was aborted.
2025-03-16 17:30:25,376 | INFO | File written out to: /ligo/groups/cal/H1/measurements/DARMOLG_SS/DARMOLG_SS_20250316T170703Z.hdf5
2025-03-16 17:30:25,384 | INFO | File written out to: /ligo/groups/cal/H1/measurements/PCALY2DARM_SS/PCALY2DARM_SS_20250316T170703Z.hdf5
2025-03-16 17:30:25,388 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L1_SS/SUSETMX_L1_SS_20250316T170703Z.hdf5
2025-03-16 17:30:25,393 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L2_SS/SUSETMX_L2_SS_20250316T170703Z.hdf5
2025-03-16 17:30:25,398 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L3_SS/SUSETMX_L3_SS_20250316T170703Z.hdf5

Sun Mar 16 10:10:04 2025 INFO: Fill completed in 10min 1secs

TITLE: 03/16 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 150Mpc
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 19mph Gusts, 13mph 3min avg
    Primary useism: 0.06 μm/s
    Secondary useism: 0.38 μm/s
QUICK SUMMARY:

IFO is in NLN and OBSERVING as of 14:00 UTC (40 min lock)

According to Corey's OWL alog 83394, H1 called Corey for help with SQZ but guardian managed to automatically lock by the time he was set up.

Wind is looking much better than yesterday. Microseism has gone down a bit and leveled off.

As I was trying to get set-up, I could see that H1 was in the INJECT SQUEEZING state (after a lockloss about 3.25hrs ago) .  So I was getting ready to focus on squeezing), but within a minute or two H1 was back to Observing automatically!  Perhaps this was a timer wake up call from being out for so long, because on Verbal, everything looked normal for H1 for the reacquisition.  Going to feed the dog breakfast (and go back to sleep...hopefully).

TITLE: 03/16 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 147Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY: High winds kept H1 down for the first part of the shift, but they eventually died down enough to allow H1 to relock. After relocking, the SQZ angle servo kept railing, so I have turned it off in case it would cause problems overnight. H1 has been locked for 2 hours.

• 23:30 - Attempting to lock H1 with winds having slightly calmed
• 03:10 - Reached NLN
• SQZ angle servo kept railing, taking H1 in and out of observing four times in total (alog83391)
• 03:39 - Observing with stable SQZ angle servo
• 05:02 - Dropped observing for 30 seconds to load SQZ_MANAGER and SQZ_ANG_ADJUST [Tagging SQZ]
  • Updated sqzparams.py to set use_sqz_ang_adjust to False and nominal state of SQZ_ANG_ADJUST to 'DOWN'
  • Currently set to 166 deg (where the servo last had it)

After 14 hours of downtime, the winds have died down enough to allow H1 to lock and resume observing as of 03:17 UTC. Spent a few extra minutes in OMC_WHITENING to damp down some slightly rung-up violin modes.

As has been happening in the past few lock acquisitions, a few minutes after reaching NLN, the SQZ angle servo railed, so I reset it with SQZ_MANAGER and started observing. Tagging SQZ

...as I was typing this the SQZ angle railed again, so I again reset it. Out of observing for one minute starting at 03:21 UTC.

There was an instance towards the start of a lock stretch overnight where the SQZ angle railed and did not fix itself until 22 minutes later, all while H1 remained observing with BNS range between 40-80 Mpc.

The SQZ angle railed at 08:10:01 UTC, SQZ_MANAGER showed a notification "SQZ angle is out of range. If SQZ looks bad, request RESET_SQZ_ASC_FDS and then FREQ_DEP_SQZ", and the BNS range dropped to around 42 Mpc. At the end of my shift last night, the same thing happened and I was able to reset the angle and return to observing (alog83384), but no one was actively monitoring H1 at this time, so the SQZ angle remained railed at 276.86 deg until it flipped to 0 deg 7 minutes later and the range improved to around 80 Mpc. Then, 13 minutes after that at 08:30:55 UTC, the SQZ angle finally starts moving positive, eventually settling around 180 deg and recovering the BNS range back to about 160 Mpc. The SQZ angle stayed steady for the rest of the lock. The SQZ Guardians did not change states during this time of poor range, and I can't glean from the logs what may have been the issue here.

TITLE: 03/15 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Wind
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY:

IFO is LOCKING in ENVIRONMENT

IFO is extremely unstable due to the wind, which during the shift has gone between 30mph 50mph. We have been unable to lock all day, and will likely only be able to relock after 5PM local time (forecasted beginning of the end for gusts).

I stayed in IDLE for times where we were incessantly losing lock but tried locking 3 times when there was a slight lull, which got us up to MAX_POWER, before losing lock again due to wind. (Midshift Report Alog 83387).

Attached is the current state of the EY wind fence. The left pane is totally torn and slid to the left side as seen.

Microseism is also on the rise while EQ activity is low.

LOG:

TITLE: 03/15 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Wind
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
    SEI_ENV state: USEISM
    Wind: 32mph Gusts, 16mph 3min avg
    Primary useism: 0.07 μm/s
    Secondary useism: 0.43 μm/s
QUICK SUMMARY: H1 has been down most of they day due to high winds. Gusts are starting to slowly calm down, so we're attempting to lock now.

• Microseism elevated around 95th percentile
• All other systems nominal

We had a small lull in wind speeds and I was able to get to MAX_POWER, but then it picked back up and we lost lock. If the wind continuiies to increase, I will sit in IDLE again until the wind comes down. Forecast is now showing wind to continue until 18:00 Local Time.

Both LLO and LHO are unlocked so no calibration sweeps have been taken.