Camilla, Sheila

We repeated a test similar to 78125, where we changed the SFI2 temperature and measured fringe wrapping by exciting ZM2 and ZM5.  The temperature of SFI2 changes the backscatter shelf amplitude seen when exciting ZM2, but not ZM5, suggesting that the source of the scattering is upstream of the isolation of SFI2.

TITLE: 10/06 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 153Mpc
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 3mph Gusts, 2mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.09 μm/s 
QUICK SUMMARY: H1 has been locked for 37.5 hours. Commissioning time scheduled today from 15:30 to 18:30 UTC.

• Wind and microseism low
• All other systems nominal

TITLE: 10/06 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 156Mpc
INCOMING OPERATOR: Ryan C
SHIFT SUMMARY:
H1 has been locked for 28 hrs, currently Observing.
I Have nothing else to report. 

LOG:
No Log

TITLE: 10/05 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 155Mpc
OUTGOING OPERATOR: Ryan S
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 16mph Gusts, 10mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.11 μm/s 
QUICK SUMMARY:
H1 is Locked and Observing & I've got no plans to change that.

TITLE: 10/05 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 156Mpc
INCOMING OPERATOR: Tony
SHIFT SUMMARY: Very quiet day with H1 observing throughout; nothing of consequence to report. H1 has been locked for 22.5 hours.

State of H1: Observing at 158Mpc

H1 has been locked for 18 hours; quiet morning so far with no drops from observing.

Sun Oct 05 10:07:49 2025 INFO: Fill completed in 7min 45secs

TITLE: 10/05 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 156Mpc
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 13mph Gusts, 9mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.11 μm/s 
QUICK SUMMARY: H1 has been locked for 13.5 hours. One drop from observing last night at 09:21 UTC from SQZ dropping out, but look like everything came back fine.

• Wind moderately low, microseism low and still dropping
• All other systems nominal

TITLE: 10/05 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 155Mpc
INCOMING OPERATOR: Ryan C
SHIFT SUMMARY:
One Lockloss @23:44 UTC & fairly easy relocked.
Back to Observing at 1:06 UTC. 
H1 has been locked for 4 Hours.
 
LOG:
No Log

Unknown Lockloss.
H1:LSC-DARM_IN1_DQ seemed to be the first channel that takes an excursion.

Relocking notes: 
Relocking was striaght forward, but had to send Y-ARM to Increase flashes. Otherwise it didn't give me any hassle.

TITLE: 10/04 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 74Mpc
OUTGOING OPERATOR: Ryan S
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 10mph Gusts, 5mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.14 μm/s 
QUICK SUMMARY:

H1 Has been locked for 27 Hours and is currently Observing.
The plan is to continue to Observe the universe for as long as possible.

TITLE: 10/04 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 150Mpc
INCOMING OPERATOR: Tony
SHIFT SUMMARY: H1 remained lock the whole day with only a few drops from observing, most of which were intentional. After the squeezer relocked, the range was a bit low, but the SQZ angle servo eventaully brought it back up over the course of about an hour. I probably could have run a SQZ angle scan right before going back into observing to fix the range sooner. H1 has now been locked for 27 hours.
LOG:

• 15:56 - Dropped observing to engage hi-gain ASC to ride through a M6.0 EQ from Japan
• 16:06 - Observing
• 18:33 - Dropped observing for calibration - alog87295
• 19:05 - Observing
• 21:02 - Dropped observing from SQZ FC unlocking
  • Guardians restored everything automatically
• 21:06 - Observing

FAMIS 27375, last checked in alog86751

There are 13 T240 proof masses out of range ( > 0.3 [V] )!
ETMX T240 2 DOF X/U = -1.57 [V]
ETMX T240 2 DOF Y/V = -1.466 [V]
ETMX T240 2 DOF Z/W = -1.024 [V]
ITMX T240 1 DOF X/U = -2.176 [V]
ITMX T240 1 DOF Z/W = 0.432 [V]
ITMX T240 3 DOF X/U = -2.304 [V]
ITMY T240 3 DOF X/U = -1.084 [V]
ITMY T240 3 DOF Z/W = -2.75 [V]
BS T240 1 DOF Y/V = -0.375 [V]
BS T240 3 DOF Y/V = -0.301 [V]
BS T240 3 DOF Z/W = -0.46 [V]
HAM8 1 DOF Y/V = -0.503 [V]
HAM8 1 DOF Z/W = -0.821 [V]

All other proof masses are within range ( < 0.3 [V] ):
ETMX T240 1 DOF X/U = -0.091 [V]
ETMX T240 1 DOF Y/V = -0.146 [V]
ETMX T240 1 DOF Z/W = -0.159 [V]
ETMX T240 3 DOF X/U = -0.122 [V]
ETMX T240 3 DOF Y/V = -0.182 [V]
ETMX T240 3 DOF Z/W = -0.153 [V]
ETMY T240 1 DOF X/U = -0.029 [V]
ETMY T240 1 DOF Y/V = 0.131 [V]
ETMY T240 1 DOF Z/W = 0.192 [V]
ETMY T240 2 DOF X/U = -0.118 [V]
ETMY T240 2 DOF Y/V = 0.177 [V]
ETMY T240 2 DOF Z/W = -0.007 [V]
ETMY T240 3 DOF X/U = 0.187 [V]
ETMY T240 3 DOF Y/V = -0.021 [V]
ETMY T240 3 DOF Z/W = 0.078 [V]
ITMX T240 1 DOF Y/V = 0.223 [V]
ITMX T240 2 DOF X/U = 0.128 [V]
ITMX T240 2 DOF Y/V = 0.229 [V]
ITMX T240 2 DOF Z/W = 0.189 [V]
ITMX T240 3 DOF Y/V = 0.078 [V]
ITMX T240 3 DOF Z/W = 0.087 [V]
ITMY T240 1 DOF X/U = 0.022 [V]
ITMY T240 1 DOF Y/V = 0.077 [V]
ITMY T240 1 DOF Z/W = -0.058 [V]
ITMY T240 2 DOF X/U = 0.012 [V]
ITMY T240 2 DOF Y/V = 0.196 [V]
ITMY T240 2 DOF Z/W = 0.074 [V]
ITMY T240 3 DOF Y/V = 0.037 [V]
BS T240 1 DOF X/U = -0.122 [V]
BS T240 1 DOF Z/W = 0.121 [V]
BS T240 2 DOF X/U = 0.037 [V]
BS T240 2 DOF Y/V = 0.122 [V]
BS T240 2 DOF Z/W = 0.013 [V]
BS T240 3 DOF X/U = -0.204 [V]
HAM8 1 DOF X/U = -0.206 [V]

There are 2 STS proof masses out of range ( > 2.0 [V] )!
STS EY DOF X/U = -4.609 [V]
STS EY DOF Z/W = 2.244 [V]

All other proof masses are within range ( < 2.0 [V] ):
STS A DOF X/U = -0.456 [V]
STS A DOF Y/V = -0.864 [V]
STS A DOF Z/W = -0.523 [V]
STS B DOF X/U = 0.179 [V]
STS B DOF Y/V = 0.945 [V]
STS B DOF Z/W = -0.348 [V]
STS C DOF X/U = -0.692 [V]
STS C DOF Y/V = 0.751 [V]
STS C DOF Z/W = 0.533 [V]
STS EX DOF X/U = -0.214 [V]
STS EX DOF Y/V = -0.152 [V]
STS EX DOF Z/W = 0.079 [V]
STS EY DOF Y/V = 1.242 [V]
STS FC DOF X/U = 0.198 [V]
STS FC DOF Y/V = -1.122 [V]
STS FC DOF Z/W = 0.607 [V]
 

Following instructions from the TakingCalibrationMeasurements wiki, at 18:33 UTC I dropped H1 out of observing to run the usual calibration sweeps. Calibration monitor and report attached.

Broadband - 18:34:20 to 18:39:38 UTC

Simulines - 18:40:57 to 19:04:04 UTC

File written out to: /ligo/groups/cal/H1/measurements/DARMOLG_SS/DARMOLG_SS_20251004T184057Z.hdf5
File written out to: /ligo/groups/cal/H1/measurements/PCALY2DARM_SS/PCALY2DARM_SS_20251004T184057Z.hdf5
File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L1_SS/SUSETMX_L1_SS_20251004T184057Z.hdf5
File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L2_SS/SUSETMX_L2_SS_20251004T184057Z.hdf5
File written out to: /ligo/groups/cal/H1/measurements/SUSETMX_L3_SS/SUSETMX_L3_SS_20251004T184057Z.hdf5

Sat Oct 04 10:07:34 2025 INFO: Fill completed in 7min 30secs

TITLE: 10/04 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 152Mpc
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 4mph Gusts, 2mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.20 μm/s 
QUICK SUMMARY: H1 has been locked for 18 hours. Looks like an EQ from Guatemala put us into EQ mode about 5 hours ago, but otherwise no issues overnight.

• Wind low, microsiesm steady just above 50th percentile
• All other systems nominal

TITLE: 10/04 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 154Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY: Observing at 155 Mpc and have been Locked for almost 8.5 hours. Quiet shift with nothing to report
LOG:

no log

Observing at 151 Mpc and have been locked for over 6.5 hours. Nothing to report

Jennie W, Keita,

Since we don't have an easy way of scanning the input beam in the vertical direction, Keita used the pitch of the PZT steering mirror to do the scan and we read out the DC voltages for each PD.

The beam position can be inferred from the pictures setup - see photo. As the pitch actuator on the steering mirror is rotated the allen key which is in the hole in the pitch actuator moves up and down relative to the ruler.

height on ruler above table = height of centre of actuator wheel above table + sqrt((allen key thickness/2)^2 + (allen key length)^2) *np.sin(ang - delta_theta)

where ang is the angle the actuator wheel is at and delta_theta is the angle from the centre line of the allen key to its corner which is used to point at the gradations on the ruler.

The first measurement from our alignment that Keita found yesterday that minimised the vertical dither coupling is shown. It shows voltage on each PD vs. height on the ruler.

From this and from the low DC voltages we saw on the QPD and some PDs yesterday Keita and realised we had gone too far to the edge of the QPD and some PDs.

So in the afternoon Keita realigned onto all the of PDs.

Today as we were doing measurements on it Keita realised we still had the small aperture piece in place on the array so we moved that for our second set of measurements.

The plot of voltage with ruler position and voltage with pitch wheel angle are attached.

Sheila, Camilla. Saved to camilla.compton/Documents/sqz/templates/dtt/Fringe_wrapping.xml

ZM2,5 Fridge Wrapping with No SQZ light

As Sheila suggested in 86836, the amount of backscatter we are seeing from SQZ should be due to light from the IFO being backscattered rather than any excess SQZ light. To confirm this I took SQZ DOWN, mis- aligned FC, blocked all three SQZ beams on SQZT0 and re-opened the beam-diverter so that the IFO light could get into HAM7 but there was no SQZ generated light. The ZM2 and ZM5 scatter shelves were the same in both this and the nominal SQZ configurations, confirming all backscattered light is coming from the IFO. Plot attached. This plot does show our ZM5 scatter has increased since 2024, ZM2 is the same.

I did the same with the 30Hz injection too, saved to Fringe_wrapping_nosqz.xml, refs 0-8 are no sqz beams, refs 9-17 are nominal FDS. Plot attached, if anything, the shoulders of the 30Hz peak are larger with no sqz beams, so again, there is no difference. 

ZM2,5 Fridge Wrapping with Different Alignments on OFI_PD_A

In FRS # 35457 and 87071, we theorized that the backscatter could be off the OFI_PD_A which we shows out beam is clipping, when we change the alignment to this PD using ZM4/5, we change the level of light on OFI_PD_A, showing we are clipping and not centered on the PD, but this also changes the level of SQZ so it's hard to compare. Unsure if there's a real difference, plot attached and ndscope. It's possible that with more light on PD_A (less clipping) there is a more scatter and a secondary ZM5 scatter shelf ~25-40Hz. Would want to repeat or misalign more to confirm. 

Other ideas that haven't been done yet: change the temperature of SFI2 and repeat backscatter measurements, repeat above with increased alignment changes the OFI_PD_A changes.