TITLE: 07/10 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 145Mpc
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 26mph Gusts, 9mph 3min avg
    Primary useism: 0.05 μm/s
    Secondary useism: 0.05 μm/s
QUICK SUMMARY:

IFO is in NLN and OBSERVING as of 21:43 UTC

Conditions look great except for slightly high winds (same as yesterday). Have been in the control room for about an hour and there have been no SQZ locklosses!

There appears to be an instability when locking ALS. The X arm green build up and ASC signals begin to shake as the DARM gain is ramped to 40 and then 400. This caused multiple locklosses until we held at green arms for a longer convergence time before going to locking ALS. I have attached a screenshot of the successful lock but the oscillation still occurred. Maybe the extra WFS convergence time ensures the green controls are more robust against the darm gain change. We should look into this.

Jennie, Elenna, Camilla, Matt

DTT saved as camilla.compton/Documents/sqz/templates/dtt/20250710_SQZdata.xml and screenshot attached.

 Sheila and Matt found that we get different temperature optimizations when optimizing the SEED beam or the RF6 with OPO locked. We tested this out again by checking the NLG again before and after using Sheila's new 85532 SCAN_OPOTEMP OPO GRD state, with a silightly increased range (0.015 rather than 0.01 and 180s rather than 120s), see plot in exports/SQZ/GRD/OPOTEMP_SCAN/. It adjusted temp -0.002deg, the NLG did not change, stayed at ~11.8.

Looks like the ITMY R0 alignment tramp was accepted in SDF at 300seconds from its usual 30sec back in June 16. This has been accpeted at 30sec now.

Lockloss July 07, 2025 17:54 UTC during commissioning due to commissioner error after over 14 hours locked (LL website not loading)

Thu Jul 10 10:05:57 2025 INFO: Fill completed in 5min 53secs

WP 12660

Last Tuesday, two 3T Gurulp seismometers in the Biergarten were powered down. A functional/huddle test was performed last November, alog 81097. Power supply and cabling was cleaned up. Before powering down, units were locked via the breakout/controller boxes. Units were left in the LVEA in the PEM area. Units are H1 spares.

Cabling and test equipment for a HS-1 geophone was also removed. This was part of the NN Seismic Array HS-1 testing down last year, alog 81257.

TITLE: 07/10 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 145Mpc
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 5mph Gusts, 2mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.05 μm/s
QUICK SUMMARY:

Observing at 145 Mpc and have been Locked for 11 hours.

TITLE: 07/10 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 144Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY:

IFO is in NLN and OBSERVING as of 03:37 UTC

H1 has been mostly well behaved this shift though the same cannot be said for the wind. Wind gusts reached 42mph and anything over 30mph was difficult to lock in. After the wind calmed down, no initial alignment was needed anmd we got to NLN quite quickly. In such a windcy environment (it's still around 28mph now), we still reached NLN 1.5 hrs after LL.

The 42mph wind gust period did cause a lockloss (Lockloss alog 85662). Instabilities and saturations that followed the gust live were seen and heard pre-LL.

Meanwhile, the SQZ FC2 SUS is complaining that it's too noisy, so the FC has been losing lock once every 5 minutes and then coming back, prompting observing sporadically. I think this is coupled to the wind because when we had a lull that went below 30mph, SQZ stayed locked. Hopefully it stays that way.

LOG:

None

Closes FAMIS 27819. Last checked in alog 85440

CO2Y:

Before: 10.3ml

After: 10.3ml

Water Added: 0ml

CO2X:

Before: 30.4ml

After: 30.4ml

Water Added: 0ml

No water leaking in our leak detection system (aka dixie cup)

The wind has been at and around 40mph for about an hour. The Squeezer has been sturggling to stay locked, with 3 SQZ locklosses bumping us into comissioning. While we were int he last one, we got a particularly strong gust which was the probably cause of the lockloss. 

Relocking again now though this will have low success if winds stay above 30mph.

Randy moved the 3IFO ISS PD array (S1202968) crate from MY storage to the OSB yesterday (WP). I opened the crate, moved the transport/storage container to the vacuum lab and optics lab to inspect. It was in a good shape except that some upgrade parts weren't there. Since I'm already forgetting what happened to other units, here's the summary.

First about parts.

• 3 of 4 units require replacement of the new PD array plate (D1300322), but we (are supposed to) have parts. I'm not sure which units were meant to be ready for installation, but if we replace the PD array plate, realignment must be done.
• None had the QPD tilt but we have enough parts for this.
• 1 of 4 units had the low QPD, i.e. QPD plane is much closer to the PSL than array PDs. No parts were located for this, and mostly for this reason we'll have to live with just two spares for 3 instruments instead of 1 spare per each instrument.
• Blue glass beam dump plates were only found for two units. The remaining two don't have these. This might be OK, the optics are easy to transplant when we pull the in-chamber unit.

Next, the summary per unit.

• Good spare S1202965 already has all upgrades. It's the only one with an updated PD array plate already installed upon initial inspection. Also see alog 83077.
• Second apare S1202966 will be OK (PD array plate will be replaced, QPD will be tilted, will use parts from the damaged unit of parts from the damaged unit S1202967 for some other things) except that blue glass beam dump optics aren't found. Also see alog 85019.
• 3IFO S1202968 will be OK (PD array plate will be replaced, QPD will be tilted).
• Damaged spare S1202967 cannot be restored in short order as that would mean locating or making/procuring new parts to make QPD higher (because the dirty parts from this unit will be reused for the second spare), C&B all new and existing metal parts, cleaning and reinstalling all optics, inspecting the surface of all 8 PDs to find particulates AND realigning the entire unit, which will be extremely time and labor intensive. Because of this, we'll only have 2 spares for three IFOs (H1, L1 and 3IFO) at least for now. Also see 82731.

Here's the thing about the PD array plate D1300322 (see attached). The updated version has a wider 100deg conical bore for larger beam clearance because it was found at some point (ECR E1400231) that the clearance was too small for the original bore and the reflection of some PDs will hit the bore wall at an glazing angle instead of hitting the beam dump. It's also easy to imagine that if you fiddle with the alignment for the production unit in chamber, INPUT light on some PDs will hit the bore wall first before hitting the PD surface.

TITLE: 07/10 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
INCOMING OPERATOR: Ibrahim
SHIFT SUMMARY: Currently relocking and in ACQUIRE_DRMI_1F. We've been struggling the last hour+ due to the wind picking up. Earlier in relocking, we were seeing some ALSX crystal frequency issues, but they thankfully went away pretty fast.

THE LVEA IS LASER HAZARD

Three lock acquisitions during my shift today:

1st) went well after running an initial alignment, but we did have a couple issues at higher level states:
- In INJECT_SQUEEZING, we noticed the 1 Hz ringup happening again. We did what Elenna mentioned in 85643 and upped the CSOFT P gain from 20 to 25. This worked to slowly fix the ringup (85649)
- The filter cavity wouldn't lock. It was unlocking when it got to TRANSITION_IR or FC_ASC_ON. I checked H1:SQZ-FC_TRANS_C_LF_OUTPUT, and it was already pretty good at around 116, but I was able to adjust FC2 to get it up to over 125. We were still losing the filter cavity after this, so I checked what was done when we had this issue a couple weeks ago (85390). I was able to confirm from checking those same channels that we were in a good spot for all of them. Sheila mentioned adjusting the OPO temp, and that worked
2nd) went quickly and I just needed to help ALSY
3rd) current relocking, struggling with DRMI/PRMI, ALSX crystal frequency, and the wind

LOG:

14:30UTC Relocking and in ACQUIRE_PRMI
    - In INJECT_SQUEEZING, we noticed the 1 Hz ringup happening again. We did what Elenna mentioned in 85643
16:11 NOMINAL_LOW_NOISE
    - FC wouldn't lock. I ended up adjusting the OPO temperature to fix this
16:56 Observing
17:39 Lockloss
19:04 NOMINAL_LOW_NOISE
19:07 Observing
21:55 Lockloss
    - Check crystal frequency issues, but not for very long
    - Couldn't lock DRMI, cycled through PRMI, MICH, etc, so decided to run initial alignment
    - Wind started going up, making it hard to keep ALS locked                                                                                                                                                                                                                                                                                            

Camilla, TJ, Dave:

Last Thursday 26th June 2025 alog85373 I restarted the HWS camera control code. We hoped this would improve the 2Hz noise comb in DARM. Initial results for F-Scan (observing) suggest it has not made much, if any difference. 

Attached F-Scans show the spectra on sun22jun2025 and mon30jun2025. The 2Hz comb (blue squares) look unchanged.

More investigation is needed to verfiy we are indeed disabling the frame aquisition on all HWS cameras when H1 is in observation.

Jennie W, Sheila, Elenna

In order to get data for mode-matching and for Elenna to get data to calibrate sideband heights we ran some mode scans after the SR3 heater was turned on last night.

16:55:24 UTC Carried out single bounce OMC scan at 10W PSL input with sensor correction on HAM6 on, high voltage on for PZT driver in HAM6, sidebands off , SRM mis-aligned, ITMY mis-aligned, DC 3 and 4 on, OMC ASC on.

Excitation freq changed to 0.005 Hz as the top peak of the TM00 mode looked squint so could have been saturating. Lowering this frequency prevented this.

Ref 15-17 corresponds to dcpd data, pzt exc signal, pzt2 dc monitor.

Then mis-aligned ITMX and aligned ITMY (Sheila had to re-align SR2 to centre on ASC-AS_C).

Measurement starts at 17:08:18 UTC.

Ref 18-20 corresponds to dcpd data, pzt exc signal, pzt2 dc monitor.

Traces saved in 20250516_OMC_scan.xml. The top left plot is the first scan bouncing beam off ITMX, the second scan is the bottom right bouncing off ITMY.

The top right is the two plots of the PZT2 DC voltage monitor. That is, the current voltage applied to the PZT. The bottom left is the plot of the voltage ramp applied to the PZT2 on the OMC for this measurement.

The ndscope attached shows the power in mA transmitted through the OMC on the top, then the PZT used for the scan DC voltage underneath, then the input PZT voltage underneath that, then the reflected power from the OMC in mW, then at the bottom the SR3 heater element temperature in degrees.

Elenna did two more scans in single bounce with sidebands back on and different modulations depths in each.

Sheila, Camilla

• Turn off SQZ ASC with H1:SQZ-ASC_WFS_SWITCH and check the SQA_ANG_SERVO isn't running once you get to FDS or FIS.
  • If you go ot no SQZ and back to FDS/FIS, need to turn off again.

Data to take and how each data is used in the model:

• No SQZ (for subtraction in models)
  • Good time to measure NLG (as in 76542) and change NLG if wanted
• Mean SQZ with ADF off (for loss calculation in models)
  • Go to FIS with SQZ_MANAGER and then take SQZ_OPO_LR guardian to DOWN
• FIS Mid SQZ +/- (for SRC de-tuning in models)
  • Try to match high frequency SQZ to No SQZ level by increasing and decreasing SQZ angle from nominal SQZ.
• FI ASQZ (for homodyne angle in models)
  • Also +/- 10deg each side of nominal
• FDS Mid SQZ +/- (for FC de-tuning)
• FDS and FIS SQZ (because we want to see how good DARM can be)
  • Maybe also +/- 10deg each isde of nominal