TITLE: 09/21 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY: We did not take the calibration measurement as LLO wasn't locked and we weren't fully thermalized either.
LOG:                                                                                                                                                         

• 12:38 UTC lockloss - FSS oscillation tag, 31:50 hour lock! (Tagging PSL)
  • ALS_Y was not locking and was stuck in GREEN arms of IA for 1.5 hours. Things went well after I adjusted ITMY in Yaw
  • 16:11 UTC Observing
  • 17:40 UTC EQ mode from a 5.3 from Alaska
• 19:49 UTC lockloss
  • AS AIR looked very pitched after this LL, ETMX locked at like 10% lower. We couldnt get PRMI, 2x check_mich so I dropped into an IA at 20:20 which started with 30 seconds of EX saturations and EX locking at another 10% lower. The WFS were able to sure it up
  • 21:30 UTC Observing
  • 21:51 UTC PI 24 started to ring up and eventually saturated the DCPCs
• 22:58 UTC lockloss from PI 24

TITLE: 09/21 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 13mph Gusts, 7mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.16 μm/s
QUICK SUMMARY: H1 just lost lock from PI mode 24 ringing up after being locked for 90 minutes. Starting lock acquisition.

• Wind low, microseism still low but slightly elevated compared to a day ago
• All other systems nominal

19:49 UTC lockloss

RickS, FranciscoL, TonyS,  JoeB, Dripta.

On Saturday, Sept. 21, 2024, the Pcal force coefficient EPICS record values were updated.

At X-end:

Old : H1:CAL-PCALX_FORCE_COEFF_RHO_T 8305.09
New : H1:CAL-PCALX_FORCE_COEFF_RHO_T 8300
Old : H1:CAL-PCALX_FORCE_COEFF_RHO_R 10716.6
New : H1:CAL-PCALX_FORCE_COEFF_RHO_R 10713.3
Old : H1:CAL-PCALX_FORCE_COEFF_TX_PD_ADC_BG 9.6571
New : H1:CAL-PCALX_FORCE_COEFF_TX_PD_ADC_BG 8.81815
Old : H1:CAL-PCALX_FORCE_COEFF_RX_PD_ADC_BG 0.7136
New : H1:CAL-PCALX_FORCE_COEFF_RX_PD_ADC_BG 0.56678
Old : H1:CAL-PCALX_FORCE_COEFF_TX_OPT_EFF_CORR 0.9938
New : H1:CAL-PCALX_FORCE_COEFF_TX_OPT_EFF_CORR 0.99331
Old : H1:CAL-PCALX_FORCE_COEFF_RX_OPT_EFF_CORR 0.9948
New : H1:CAL-PCALX_FORCE_COEFF_RX_OPT_EFF_CORR 0.9944
Old : H1:CAL-PCALX_XY_COMPARE_CORR_FACT 0.9991
New : H1:CAL-PCALX_XY_COMPARE_CORR_FACT 0.99855

At Y-End:

Old : H1:CAL-PCALY_FORCE_COEFF_RHO_T 7145.62
New : H1:CAL-PCALY_FORCE_COEFF_RHO_T 7155.15
Old : H1:CAL-PCALY_FORCE_COEFF_RHO_R 10649.6
New : H1:CAL-PCALY_FORCE_COEFF_RHO_R 10663.6
Old : H1:CAL-PCALY_FORCE_COEFF_TX_PD_ADC_BG 18.2388
New : H1:CAL-PCALY_FORCE_COEFF_TX_PD_ADC_BG 18.3088
Old : H1:CAL-PCALY_FORCE_COEFF_RX_PD_ADC_BG -0.2591
New : H1:CAL-PCALY_FORCE_COEFF_RX_PD_ADC_BG -0.7353
Old : H1:CAL-PCALY_FORCE_COEFF_TX_OPT_EFF_CORR 0.9923
New : H1:CAL-PCALY_FORCE_COEFF_TX_OPT_EFF_CORR 0.99191
Old : H1:CAL-PCALY_FORCE_COEFF_RX_OPT_EFF_CORR 0.9934
New : H1:CAL-PCALY_FORCE_COEFF_RX_OPT_EFF_CORR 0.9931
Old : H1:CAL-PCALY_XY_COMPARE_CORR_FACT 1.0005
New : H1:CAL-PCALY_XY_COMPARE_CORR_FACT 1.00092

The caput commands used for updating the ePICS records can be found here: https://git.ligo.org/Calibration/pcal/-/blob/master/O4/EPICS/results/CAPUT/Pcal_H1_CAPUTfile_O4brun_2024-09-16.txt?ref_type=heads

SDF diff has been accepted.

It has been roughly 4 months since the last update on May 2024. We plan to update the EPICS reords regularly, since over the course of a year , we observed that the Rx sensor calibration exhibits a systematic variation by as much as +/- 0.25 % at LHO.  End station measurements allow us to monitor this systematic change over time. We will monitor the X/Y comparison factor to see if these EPICS changes had any significant effect on it. If the update is done correctly, there should be no significant change in the X/Y calibration comparison factor. If we find that there is a signifricant change in it, then we will correct the ePICS records accordingly.

Attached .pdf file shows the Rx calibration (ct/W) trend at LHOX and LHOY end for the entire O4 run. It marks the measurements used to calculate the Pcal force coefficients EPICS record values for the previous update at the start of the O4b run as well as the current update.

The pngs are the screenshots of the MEDM screen after the EPICS update.

Sat Sep 21 08:11:59 2024 INFO: Fill completed in 11min 55secs

TITLE: 09/21 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Aligning
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 10mph Gusts, 5mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.15 μm/s
QUICK SUMMARY:

• We're in an initial alignment
• Lost lock at 12:38 UTC
• NUC33 froze again, so I power cycled it

TITLE: 09/21 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 152Mpc
INCOMING OPERATOR: Oli
SHIFT SUMMARY: Very quiet shift, H1 remained locked throughout. Only events of note were a brief drop in observing because of the SQZ PMC and an earthquake passed through.

• 00:51 - Dropped observing from "PMC_REFL_RF35 demod error" in SQZ_PMC Guardian (tagging SQZ)
  • Guardian brought everything back automatically
• 03:15 - Entered EQ mode from M5.6 quake out of Tonga
• 03:54 - Seismic back to CALM

H1 has now been locked for just over 24 hours.

TITLE: 09/20 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 153Mpc
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY:
LOG: The range was in the upper 150s for most of shift, we've been locked for almost 19 hours!                                                                                                                                                                                                                                                       

HAM6 OMC TRANS camera was pretty jittery the whole shift

18:15 UTC, EDC reports 12 DC chans again, from NUC33. The NUC doesn't look frozen as the SQZ plot is still updating.

TITLE: 09/20 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 152Mpc
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 16mph Gusts, 9mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.10 μm/s
QUICK SUMMARY: H1 has been locked and observing for 18 hours. Sounds like it's been a quiet day.

• Wind and ground motion low
• All other systems nominal

We've been locked for a little over 14 hours, its been a calm day.

The range has been in the high 150s all morning.

The low range check yielded < ~14 Hz SRCL & CHARD_Y (and at >95Hz), and > ~14 Hz PRCL (and at >95Hz) & DHARD_Y coherence.

Fri Sep 20 08:09:52 2024 INFO: Fill completed in 9min 48secs

Closes FAMIS26298

Laser Status:
    NPRO output power is 1.824W (nominal ~2W)
    AMP1 output power is 64.37W (nominal ~70W)
    AMP2 output power is 137.4W (nominal 135-140W)
    NPRO watchdog is GREEN
    AMP1 watchdog is GREEN
    AMP2 watchdog is GREEN
    PDWD watchdog is GREEN

PMC:
    It has been locked 23 days, 21 hr 37 minutes
    Reflected power = 22.08W
    Transmitted power = 104.2W
    PowerSum = 126.3W

FSS:
    It has been locked for 0 days 11 hr and 13 min
    TPD[V] = 0.804V

ISS:
    The diffracted power is around 2.2%
    Last saturation event was 0 days 11 hours and 13 minutes ago

Possible Issues:
    AMP1 power is low, there was a step down about 47 days ago.
    PMC reflected power is high, it appears to have been rising for the past >2 months.

TITLE: 09/20 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 150Mpc
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 10mph Gusts, 6mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.08 μm/s
QUICK SUMMARY:

• We've been locked for 9:45
• The wind has calmed down, we survived an earthquake 3 hours ago (5.2 from Tonga)

Followed instructions in 74681. Last done in 78782, 79988.  Saved in /ligo/gitcommon/NoiseBudget/aligoNB/aligoNB/H1/couplings/  and pushed to git.

CHARD_P, CHARD_Y, MICH, PRCL, SRCL screenshots attached. The IFO had been in NLN for 4h15 when these were taken. The AS_A_YAW and PRCL offsets were turned off.

Sheila, Louis, Francisco

Following LHO:80044, we measured ASC-DHARD_P(Y) for different ASC-AS_A_DC_YAW_OFFSET and found the loswet values of DHARD_Y at an offset of -0.05.

The "DTT_AS_A_*.png"s show the outputs of DHARD_DARM_240912 when changing AS_A_DC_OFFSET with a reference trace for when the offset was nominal (ASC-AS_A_DC_YAW_OFFSET = -0.15). Each trace has a marker at the two highest peaks in the ASC-DHARD power spectrum (the middle plot on the left). DTT_AS_A_neg0_05 shows the lowest value in the power spectrum compared to DTT_AS_A_neg0_10, while preserving coherence (lowest-left) and phase values (middle-rigt), compared to DTT_AS_A_0. AS_A_NDSCOPE corroborate on the times at which these measurements were done and the values for AS_A offset.

Vicky, Sheila, Naoki

First we tried SRCL offset of -400, which looked good in yesterday's FIS SRCL offset measurement 79903. We took the calibration measurement with SRCL offset of -400 in 79911, but Louis reported in the mattermost that there is a large optical spring in the sensing function. Also, FDS with SRCL offset of -400 is worse than nominal. Vicky will add more plots for this.

Then we decided to change the SRCL offset to -290 and optimized FC detuning. This improved the sensitivity below 100 Hz as shown in the first attachment and improved the range by ~5Mpc. The optimal FC detuning changed from -34 Hz to -28 Hz and this could be because of SRCL offset change and arm power change.

After FC detuning improvement, we took the calibration measurement with SRCL offset of -290 in 79922, but the measurement did not make sense according to Louis so we took an another calibration measurement with SRCL offset of -290 in 79928.