Called for the thrid time tonight:
First 2 times I just thought it was the wind kinda gusting too hard during LOWNOISE_ESD_ETMX as it was faily gusty between Costco & target here.
But.... this time the wind had calmed down significantly.

In the Last 4 Hours We have lost lock in the exact same spot 5 times.  Each time there is a Lownoise_ESD_ETMY state, then 4 seconds of Lownoise ETMX state then lockloss.

Troubleshooting: 
Maybe the issue is here: alog 88089. So I quickly reverted the changes in the code here right after power up, but I guess the power to the ITM ESD was tunt off as stated in that alog. So now I'm stuck at Transistion_From_ETMX with no way out except for manualing back to Lownoise_Coil_driver. Reverting my changes then Loading the guardian again and pushing forward to Lownoise_ESD_ETMY. 

Now  I'm hanging out at Low noise ESD ETMY for greater than 4 seconds, So we can rightfully say that the issue is in Lownoise_ESD_ETMX.
When I clicked into Lownoise_ESD_ETMX my Guardian back ground flashed red... indicating guardian issues , then:
E_X   (Nov 15 14:54:58 UTC)
E_Y   (Nov 15 14:54:58 UTC)
I_X   (Nov 15 14:54:58 UTC)
DRMI Unlocked   (Nov 15 14:54:58 UTC)
HAM6   (Nov 15 14:55:03 UTC)
ISC_LOCK state: DOWN   (Nov 15 14:55:04 UTC)
So the issue is certainly in LOWNOISE_ESD_ETMX. 

TITLE: 11/15 Owl Shift: 0600-1530 UTC (2200-0730 PST), all times posted in UTC
STATE of H1: Wind
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 22mph Gusts, 18mph 3min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.34 μm/s 
QUICK SUMMARY:

H1 called me, to watch it get locked again. 
Another lockloss at Lownoise_ESD_ETMY... 
I did another Initial_Alignment after that lockloss. we are currently just past DRMI again.
I will let it try again. The wind forecast looks like it will stay gusting in the 20's for a few hours but may start slowing around 11UTC. 

TITLE: 11/15 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Wind
INCOMING OPERATOR: Tony
SHIFT SUMMARY:

IFO is in ENGAGE_ASC_FOR_FULL_IFO and ENVIRONMENT

Still not locked due to wind and microseism.

Microseism just went below the 90% line where it's now lockable. As that happened we got gusts of wind from 35 to 45mph. The wind just went below 30mph so I think this lock acquisition might just work!

We lost lock over 30 times in this acquisition, making it to TRANSITION_FROM_ETMX twice before losing lock seemingly due to instability.

LOG:

None

Attached is the mode-matching layout for the VOPO. The target primary waist of the VOPO (from TT1700104) is 221.2um(s), 206um(t) for 1064nm and 159.2um(s), 148.8um(t) for 532nm.

The mode matched minor and major beam waist is 198.6um, 204.2um for 1064nm and 152.6um, 185um for 532nm. For the fundamental injection via the rear mirror, the measured waist is 197.25um, 231.85um. These waist is measured at the position marked with a "star". The mode-matching calculation has been reviewed by a fur-low scientist.

TITLE: 11/15 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Microseism
INCOMING OPERATOR: Ibrahim
SHIFT SUMMARY: Unsuccessful day of locking, microseism continues to decrease, its starting to get below the 90th percentile, the wind has also calmed down over the past hour. We have been able to lock DRMI a few times, the highest we've made it has been MAX_POWER.
LOG:                                                                                 

16:11 UTC IA

TITLE: 11/15 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Microseism
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: USEISM
    Wind: 13mph Gusts, 6mph 3min avg
    Primary useism: 0.05 μm/s
    Secondary useism: 0.55 μm/s 
QUICK SUMMARY:

IFO is LOCKING in ENVIRONMENT

Microseism is terrible but trending down. Wind has also been terrible but seems to be getting ok. Hoping to get locked during this shift as the microseism continues to trend down/

Fri Nov 14 10:13:11 2025 INFO: Fill completed in 13min 7secs

Jordan confirmed a good fill curbside.

In 88046 the OFI temperature slowly scanned while we were in observing, we lost lock while the temperature was still scanning but we got through the minimum of power sent to HAM7.  

The first attachement shows the time series.  The second shows that the AS power drifted during the test but the ratio of OFI PD A (pick off of TFP reflection towards HAM7) to AS_C (power into HAM6) shows the OFI temperature dependence nicely. 

In the third attachment, the blue dots are averages of the last 10 minutes at each OFI temperature.  This is fit to a model for the constant leakage, temperature coefficient and temperature that minimizes leakage: leakage ratio =  constant_leakage + 1* sin^2(  (pi /180 )* angle_coefficent * (temp - best_temp)

The impact of the misrotation of the OFI is sitting on top of 0.34% constant leakage that doesn't change with OFI temperture, presumably the reflection of the thin film polarizer.  The OFI seems to rotate the polarization by 0.12 degrees of rotation per degrees C, which can be compared to the estimate of 0.2 deg / deg C from 57965.  

Closes FAMIS#27828, last checked 87799

TCSX Chiller read 30.5, TCSY read 10.5, so I did not add any water. Filters and water flow looks good, and there is no water in the Dixie Leak Detector™

We had a couple of HAM1 vacuum glitches yesterday evening (Thursday 13th November 2025) at 18:24 and 22:24 PST. The first glitch caused a VACSTAT alarm because its slope just exceeded the 1.0e-09 torr/min trip level, the second did not reach this level. 

These both look like sensor glitches (not gas releases), the pressure is a square wave with no pumpdown curve.

I restarted VACSTAT at 20:44, roughly at the mid point between the glitches, to clear the alarm.

TITLE: 11/14 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Microseism
OUTGOING OPERATOR: Anthony S.
CURRENT ENVIRONMENT:
    SEI_ENV state: USEISM
    Wind: 15mph Gusts, 11mph 3min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.81 μm/s  (peak 1.349 um/sec)
QUICK SUMMARY:

• We've been down all night/morning (OWL report, EVE report)
•  Microseism looks to be on the decline over the past 18hours
  • I'm going to attempt to relock
• The winds is moderate
• The IMC has been unlocked and trying to relock since 12:44 UTC
  • Its stalled, probably due to ISC_LOCK's IDLE not having any requests

TITLE: 11/14 Owl Shift: 0600-1530 UTC (2200-0730 PST), all times posted in UTC
STATE of H1: Microseism
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
    SEI_ENV state: USEISM
    Wind: 5mph Gusts, 3mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.86 μm/s 
QUICK SUMMARY:
Eve shift had left the IFO in Idle to wait out the higher useism.
I woke up at 2am to see if the useism was low enough to lock since it was falling. 
H1 went through an Initial Alignment before trying to lock, which took longer than expected locking the green Arms. 
Once that was done I allowed DRMI to try to lock a handfull of times. I think when it fails this time I will leave it in idle and try again in a few more hours. 

TITLE: 11/14 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Microseism
INCOMING OPERATOR: Tony
SHIFT SUMMARY: Another shift of no observing time for H1 due to the high microseismic motion. Tony will check on things overnight to see if conditions improve, and I've re-enabled sensor correction in case he decides to give locking a try.

TITLE: 11/14 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Microseism
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY: In IDLE and not currently trying to relock due to the high secondary microseism. Really nothing happened all day besides some opportunistic commissioning and out of lock work.
LOG:

15:30UTC In DOWN due to very high secondary microseism
    - Decided to run an initial alignment just for fun
        - Issue with FSS oscillation
    16:47 Decided to take the ifo to IDLE from ACQUIRE_DRMI since it wasn't catching and we wanted to do some out of lock commissioning                                                                                                                                                                   

TITLE: 11/14 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Microseism
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 3mph Gusts, 1mph 3min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 1.22 μm/s 
QUICK SUMMARY: H1 has not been locked all day due to the very elevated microseismic motion and is currently holding in IDLE. If I see it come down enough, I'll try to have H1 lock, but I don't think this is forecasted to get better any time soon.

• Wind low, microseism very high
• All other systems nominal

Ibrahim, Betsy

BBSS Eliptical Baffles (D2500293) were successfully installed today. Pictures from various angles are attached.

Problems - graphics regarding these are attached as slide screenshots

• D2000483 Type 2 - 12 O'Clock Baffle Brace
  • LHO did not recieve coated parts for this*, but it does not seem like this part is visible due to the baffle itself.
    • Note*: LHO recieved one coated part weeks after ours had gone into C&B so wasn't part of same set/load - either way missing one coated.
  • This part is extremely difficult to install due to poor sighting and no room. The screw that fastens this part has to be installed from behind the figure 8, where there isn't even enough room to fit the width of a 9/64 allen wrench. A combination of tweezers, wrenches, bent T-wrenches were used and we finally got it in. However, we could not tighten much in the case of the back.
  • Potential Fix: The sides of that thru hole have free thru holes that could fit another bracket instead of the 12 O'Clock one (~11 and ~1 O'Clock).
• D2000483 Type 1 - 6 O'Clock Baffle Brace
  • Helicoil call-out is incorrectly 1/4-20 X 1.5D but using those results in the helicoils bottoming out and appearing proud. So, removed and used 1D instead - it works. Will redline
• D1900594 V10 Mounting Bracket
  • 2 of these were too long to fit into its recessed spot in the Lower Structure, which seemed like a machining issue (barely 0.2 mm if I had to guess). To fix this, betsy and I filed off the problem surfaces until they fit. The filed surface is a mating surface and we used a clean-file.
  • Part incorrectly called a wire baffle - will edit DCC and redline

Remarks: I added one of those coated screw caps to the Y-Brace (D1900589) strut fasteners since I could see it shining in the head on picture. Comparison pictures for this are below.

M. Todd

From some of the modeling I've been doing, I've come up with a slew of estimates for coupling factors of TCS power settings to substrate and surface defocus. I've put them into TCS and SDF'd them, hoping that the next week or two we get some good confirmation of these numbers.

Varun, Stefan

We repeated the PRC Gouy phase measurement that was pinoreered by KAGRA in klog 9241 and 9246.
In short, the method consistes for just kicking the PRC mirror out as fast as possible.

We really want to run this method on the SRC, but today only the PRC was available.

When we finally did it right (measurement 2) we scanned acros 19 FSRs. That allowed us to do a very clean spline fit for the velocity.
We find:
PRC one-way Gouy phase: 23.23deg (mean of 19 measurements in 1 sweep).
Standard deviation of data set: 0.17deg
Standard deviation of mean: 0.04deg.
We would not be surprised if there is some systematic error that is slightly bigger. But we would trust the result to about 0.2deg.

Measurement details:

- Measurement 1: We held MICH at its DC control value, but forgot that the LSC trigger cut it off. (Settings: PRCL2 OFFSET: +3e5) (Plot 1)
- Measurement 2: We didn't bother holding MICH, but froze the POP_RF18 output to avoid the LSC triggering to shut off the drive. (Settings: PRCL2 OFFSET: -1e6) (Plot 2,3)
- xml data files and scripts are attached - more details in folder /ligo/home/controls/sballmer/20191015