We had just finished the calibration measurement 3 minutes earlier, 20:03 lockloss

Simulines start: The wind started picking up during the measurement.

PST: 2025-01-11 11:36:44.979063 PST
UTC: 2025-01-11 19:36:44.979063 UTC
GPS: 1420659422.979063

Simulines stop:

PST: 2025-01-11 12:00:27.281127 PST
UTC: 2025-01-11 20:00:27.281127 UTC
GPS: 1420660845.281127

Files:

2025-01-11 20:00:27,195 | INFO | File written out to: /ligo/groups/cal/H1/measurements/DARMOLG_SS/DARMOLG_SS_20250111T193645Z.hdf5
2025-01-11 20:00:27,203 | INFO | File written out to: /ligo/groups/cal/H1/measurements/PCALY2DARM_SS/PCALY2DARM_SS_20250111T193645Z.hdf5
2025-01-11 20:00:27,208 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L1_SS/SUSETMX_L1_SS_20250111T193645Z.hdf5
2025-01-11 20:00:27,213 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L2_SS/SUSETMX_L2_SS_20250111T193645Z.hdf5
2025-01-11 20:00:27,218 | INFO | File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L3_SS/SUSETMX_L3_SS_20250111T193645Z.hdf5

Closes FAMIS26346

Laser Status:
    NPRO output power is 1.851W
    AMP1 output power is 70.19W
    AMP2 output power is 137.0W
    NPRO watchdog is GREEN
    AMP1 watchdog is GREEN
    AMP2 watchdog is GREEN
    PDWD watchdog is GREEN

PMC:
    It has been locked 25 days, 0 hr 12 minutes
    Reflected power = 25.46W
    Transmitted power = 104.6W
    PowerSum = 130.0W

FSS:
    It has been locked for 0 days 15 hr and 6 min
    TPD[V] = 0.8127V

ISS:
    The diffracted power is around 2.5%
    Last saturation event was 0 days 15 hours and 7 minutes ago

Possible Issues:
    PMC reflected power is high

Sat Jan 11 10:18:17 2025 INFO: Fill completed in 18min 14secs

TCmins [-110C, -107C] OAT (10C, 50F)

TITLE: 01/11 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 155Mpc
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 5mph Gusts, 2mph 3min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.48 μm/s
QUICK SUMMARY:

• We've been locked for 11 hours, in observing since 14:49 UTC
  • PI 24 has rung up and been damped 2 this lock
• 2ndary microseism is decreasing, wind is low

TITLE: 01/11 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 158Mpc
INCOMING OPERATOR: Oli
SHIFT SUMMARY:

IFO is in NLN and OBSERVING as of 05:05 UTC

Overall calm shift with one slightly annoying LL during an opo temp optimization. The reacquisition was slow due to the environment (high winds and an earthquake) but was ultimately fully automatic after an initial alignment. Lockloss alog 82215

Other than this, the SQZ opo temp had to be adjusted so I went out of OBSERVING for 6 mins (5:05 UTC to 5:11 UTC) and adjusted it successfully bringing range from ~138 to ~158MPc (screenshot attached).

Otherwise, the microseism seems to be coming down slowly and high winds have calmed down.

LOG:

None

Unknown cause lockloss but reasonable to assume it was either microseism or squeeze related (though I'm unsure if SQZ can cause a LL like that).

The lockloss happened as I was adjusting the SQZ OPO temperature since in the last hour, there has been a steady decline in H1:SQZ-CLF_REFL_RF6_ABS_OUTPUT channel. After noticing this, I went out of OBSERVING and into CORRECTIVE MAINTENANCE to fix. It was actually working (the channel signal was getting higher with each tap when the LL happened. This coincided with a 5.2 EQ in Ethiopia, which I do not think was the cause but may have moved things while in this high microseim state. I've attached the trends from SQZ overview and OPO temp including the improvements made. If it is possible to induce a LL changing the OPO temp, then this is likely what happened, though the LL did not happen when the temp was being adjusted, as the 3rd screenshot shows.

TITLE: 01/11 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 156Mpc
INCOMING OPERATOR: Ibrahim
SHIFT SUMMARY:
IFO Has been locked for 9 hours.
It's been a perfect day for Observing.
Nothing to really report.


LOG:                                                                                                                                                                                                                                                                                            

TITLE: 01/11 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 152Mpc
OUTGOING OPERATOR: Tony
CURRENT ENVIRONMENT:
    SEI_ENV state: USEISM
    Wind: 6mph Gusts, 2mph 3min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.48 μm/s
QUICK SUMMARY:

IFO is in NLN and OBSERVING as of 15:24 UTC

Jennie W, Sheila,

On Wednesday Sheila and I compared the measurement of HAM 6 throughput taken in April 2024 where we stepped the DARM offset and then compared the power at the ASC port which is sensitive to DARM with the power on the DCPDs, with the HAM 6 efficiency for this light predicted by the known losses as obtained from the squeezer noise budget.

We found that combining both of these results in a prediction of unknown losses of 12.2% which sort of matches the 10.4% unknown losses predicted from squeezing measurements (alog # 82097).

HAM6 throughput measured in April 2024 from alog #79146.: 80.2%

HAM6 known losses: google sheet (1-0.00072)*(1-0.015)*(1-0.0096)*(1-0.044)*(1-0.02) = 91.3% expected HAM6 throughput

Unknown HAM6 losses based on this measurement = 1-0.802/0.913 = 12.2%

Yesterday I looked at Camilla and Elenna's DARM step measurement from 21st October 2024, and found the unknown loss is 10.2 % using the HAM6 throughput measured in October which matches the 10.4% unknown losses predicted from squeezing measurements (alog # 82097).

HAM6 throughput measured in October 2024 from alog #82204: 82 %

Unknown HAM6 losses based on this measurement: 1-0.82/0.913 = 10.2%

Fri Jan 10 10:10:06 2025 INFO: Fill completed in 10min 3secs

Jordan confirmed a good fill curbside. TCmins [-92C, -90C] OAT (1C, 34F)

TITLE: 01/10 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 140Mpc
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: USEISM
    Wind: 9mph Gusts, 6mph 3min avg
    Primary useism: 0.05 μm/s
    Secondary useism: 0.62 μm/s
QUICK SUMMARY:
H1just recently locked  and Observing 7 minues before I walked in.
Everything looks like it is working well at first glance, except H1:PEM-CS_DUST_LAB2  still doesn't work.
 

TITLE: 01/10 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 159Mpc
INCOMING OPERATOR: Oli
SHIFT SUMMARY: Very quiet shift with only one brief drop from observing. H1 has now been locked for 7 hours.

• 05:36 - Dropped observing for 4 minutes when SQZ PMC unlocked; everything came back automatically

TITLE: 01/10 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 160Mpc
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY: Calibration and commissioning time in the morning. One lock loss after that where I requested and initial alignment and it run that as well as main locking on its own. The squeezer issues this morning seem to be fixed. The useism is quite high, but we were able to relock.
LOG:

• 1501-1615 in and out of Observing multiple times from SQZ issue and fix.
• 1630 Calibration and commissioning start
• 2122 Lock loss
• 2253 Observing

TITLE: 01/10 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 160Mpc
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
    SEI_ENV state: USEISM
    Wind: 6mph Gusts, 3mph 3min avg
    Primary useism: 0.06 μm/s
    Secondary useism: 0.70 μm/s
QUICK SUMMARY: H1 has been locked and observing for just over an hour.

• Wind is low, microseism higher since yesterday but possibly turning around
• All other systems nominal

1420492969

ETM glitch tag, looks like there was some glitchy behavior from ETMX just before the lock loss.

useism is getting to the point that it might be tough to relock, we shall see.

Sheila, Camilla

After TJ found out OPO was struggling to get enough SHG pump power to lock 82196, Sheila repeated Daniel's 82057 SHG work as he had increased H1:SQZ-SHG_GR_DC_POWERMON from 95 to 125mW but now it's down to 92mW: Tried steering the beam with picos moves, and by adjusting the temperature it improved to 93mW only.

We went only SQZT0 and Sheila adjusted the alignment into the OPO pump fiber with the OPO unlocked, bringing the the OPO REFL DC power from 1.7 to 1.9mW.   We also moved the SHG wave plate further to maximize the amount of light Now CLF could lock with controlmon around 5.8V. Much better and closer to the center of the range so should avoid this mornings 82196 issues.

Homdyne Work:

• Increased SEED power from 0.6 to 70. Subtraction was fine and we adjusted the LO waveplate to balance the LO and SEED powers.
• Measured visibility with the oscilloscope to be (1930-25.6)/(1930+25.6) = 97.4% visibility. No alignment changes needed.
• Found that the issue we saw with the LO unlocking yesterday 82153 was that  the LO loop was unstable, we reduced H1:SQZ-LO_SERVO_IN2GAIN gain, see notes below

To take the below data, SEED power reduced back to 0.6mW, and then:

• NLG measured at (Toggle SQZ/HD path and follow 76542)
• Took SQZ_MANAGER to SQZ_READY_HD (FC2 misaligned) and take data on HD DTT
• Change opo_grTrans_setpoint_uW in sqzparams.py, reload OPO guardian, take it to NO_ISS and then back to LOCKED_CLF_DUAL to check it can reach opo_grTrans_setpoint_uW
• Repeat

We measured ~6.5dB of SQZ on the HD and up to 19dB of ASQZ. Plot attached.

Next time we work on the HD, we should measure the LO loop to know the correct gain to use.

SQZ data set

• Brought opo_grTrans_setpoint_uW back to 80uW, it locked with controlmon at 6. This is now much closer to the center of the range so should avoid this mornings 82196 issues.
• Measured NLG to be: 10.2
• Before starting to take data, paused SQZ_MANAGER, turned off SQZ ASC and SQZ_ANG_ADJUST to DOWN
• FDS data and FIS data all saved to camilla.compton/Documents/sqz/templates/dtt/SQZdata_20250109.xml
• I took 4 minutes of data for FDS, then 3 minutes for FIS but only 2 minutes each for FIS ASQZ +/-10deg as we were running out of time.
• Back to observing reverted the OPO_SERVO_COMEXCEN sdf diff from dither locking, this should be turned off in SQZ_MANAGER, accepted new OPO temp.

All wrapped up, returned to Observing at 2002UTC.