Got called again because we can't get past OFFLOAD_DRMI_ASC due to excessively high secondary microseism. We've had three DRMI catches in the last hour, all three of which died before finishing offloading DRMI ASC. Locklosses were from TRANSITION_DRMI_TO_3F, TURN_ON_BS_STAGE2, and DRMI_LOCKED_CHECK_ASC. It definitely looks like the issue is the high secondary microseism. The secondary microseism isn't as bad as it was earlier today, but it's still pretty high (nuc5). Looking at the secondary microseism channels in the Z direction (since that's where it's moving us the most), it looks like the level of microseism that we're seeing right now is the level that we last lost lock at (although we didn't lose lock because of the high microseism - there was some weird wiggle).

So since the secondary microseism looks to be heading downward, if this current DRMI can't catch and we lose lock, I'm going to put the detector in DOWN for now and come back in a couple hours to try again. Hopefully by then the secondary microseism will have gone down a bit further and we'll be able to lock.

Got called 6 minutes into my OWL shift due to the BSC2 ST2 ISI stages tripping during MICH_BRIGHT_LOCKED (in INITAL_ALIGNMENT). The rest of the inital alignment finished fine, so we're attempting to lock now, although I know the very high microseism has been making that really hard today.

TITLE: 11/02 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Microseism
INCOMING OPERATOR: Oli
SHIFT SUMMARY: The secondary microseism is at about the same level as the start of the shift but the wind is much lower. We have not been able to lock DRMI or PRMI for more than a few seconds this shift. The alignment keeps running away, we get stuck in a loop of PRMI to CHECK_MICH. I also adjusted the SQZ SHG_FIBR_REJ power while we we're trying to get DRMI.
LOG: No log.

00:02 UTC IA

After going into CHECK_MICH then back to PRMI it looks worse

02:08 UTC IA

04:50 UTC IA

TITLE: 11/01 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Microseism
INCOMING OPERATOR: Ryan C
SHIFT SUMMARY:
H1 has been locked and Observing for 0 hours all day due to High microseism & High wind speeds.
Microseism seems to be slowly coming down.
No calibration was done today.
LOG:
No Log

FAMIS 27401 PSL Status Report - Weekly
Laser Status:
    NPRO output power is 1.836W
    AMP1 output power is 70.51W
    AMP2 output power is 139.2W
    NPRO watchdog is GREEN
    AMP1 watchdog is GREEN
    AMP2 watchdog is GREEN
    PDWD watchdog is GREEN

PMC:
    It has been locked 2 days, 1 hr 40 minutes
    Reflected power = 24.68W
    Transmitted power = 107.0W
    PowerSum = 131.7W

FSS:
    It has been locked for 0 days 0 hr and 42 min
    TPD[V] = 0.5318V

ISS:
    The diffracted power is around 3.4%
    Last saturation event was 0 days 4 hours and 37 minutes ago

Possible Issues:
    PMC reflected power is high

TITLE: 11/01 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Microseism
OUTGOING OPERATOR: Tony
CURRENT ENVIRONMENT:
    SEI_ENV state: USEISM
    Wind: 24mph Gusts, 16mph 3min avg
    Primary useism: 0.08 μm/s
    Secondary useism: 0.83 μm/s 
QUICK SUMMARY:

• We haven't been able to relock following the earlier lockloss
• Secondary microseism is very high, the wind is high as well

TITLE: 11/01 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Microseism
CURRENT ENVIRONMENT:
    SEI_ENV state: USEISM
    Wind: 39mph Gusts, 30mph 3min avg
    Primary useism: 0.11 μm/s
    Secondary useism: 0.77 μm/s 
QUICK SUMMARY:

No calibration was done due to, being unlocked.
H1 hasn't been able to get past DRMI all morning.
Secondard microseism has fallen a little bit.... but the wind has picked up the slack. :(
The wind's forcast is not looking great either.

Sat Nov 01 10:08:48 2025 INFO: Fill completed in 8min 44secs

TITLE: 11/01 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: Ryan S
CURRENT ENVIRONMENT:
    SEI_ENV state: USEISM
    Wind: 3mph Gusts, 1mph 3min avg
    Primary useism: 0.07 μm/s
    Secondary useism: 0.87 μm/s 
QUICK SUMMARY:

Walking in H1 was unlocked and had been for a while.
Looks like it was a H1 called the Ryan S and gave him a  rough 2ndairy useism night for the Owl Shift last night.

I took OPS_Observatory mode back to Microseism since the useism is still elevated unfortunately. I was however able to lock DRMI for a short stint before a lock loss. 
We have a 28ft waves in the Gulf of Alaska, and 17ft waves off the coast of WA. Let's see what sort of locking we can do. 
But on the bright side.... the STS BLRMS dont look as bad, the wind is low, and I can get DRMI to lock! Maybe we can get locked and stay locked throughout this. 
 

H1 called for assistance at 08:20 UTC as it was struggling to relock. Understandable, as the secondary microseism has been rising today and is now to the point where all STS BLRMS are well into the red. After 90 minutes, I finally got H1 to lock DRMI despite good-looking alignment, but it fell apart as it was checking ASC. I'll keep at it for a while, but if the microseism doesn't improve, I may leave H1 down for the night.

TITLE: 11/01 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 151Mpc
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY: One lockloss with an easy relock, I've left damping off for EX mode1. We've been locked for just over 2 hours.
LOG:

01:29 UTC lockloss

03:41 While in ADS_TO_CAMERAs I saw the 1Hz start so I brought us to ASC Hi Gn and sat for a few minutes before reverting, I slowly stepped through states above LASER_NOISE

03:48 UTC Observing

04:20 UTC The DARM fom started to timeout and lose connection and would stop displaying the data periodically

04:55 UTC Restarted NUC25 to try to revive pimon which I noticed was not running, running just the launch.sh gave an error for it. (The restart did not work either)

01:29 UTC lockloss, there was a wiggle in PR_GAIN right before the LL. Lockloss tool looks to be offline for the last hour.

TITLE: 10/31 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 149Mpc
INCOMING OPERATOR: Ryan C
SHIFT SUMMARY:
H1 stayed locked througout the entire shift But there was some DARM commotion from 20 ~40 Hz today 
The "Control Room Collectived" decided, warrantlessly, to blame the person slowly driving the boom lift down the length of the beam tube sealing cracks in the top of the beam tube.
We got him on the phone, and the PEM expert asked him to dance do a Seismic injection [18:08 UTC] while we watched him from the roof cameras. 
Turns out the 20-40 Hz noise was not from the boom lift  & may have been from the artillery range west of here.
 

18:59 Superevent Candidate S251031cq  !!

LOG:
                                                                                                                                                                                                                                                                                                

TITLE: 10/31 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 149Mpc
OUTGOING OPERATOR: Tony
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 8mph Gusts, 6mph 3min avg
    Primary useism: 0.11 μm/s
    Secondary useism: 0.48 μm/s 
QUICK SUMMARY:

• Secondary microseism is elevated, just below the 90th percentile
  • The range has been slowly dropping over the long lock
• We've been locked for over 22 hours
• Wind is low
• Some violin damping settings are not in as GRD won't let me
  • If we drop OBS I'll fix this, the main method od DAMP_FULL_POWER needs to run again

M. Todd, S. Dwyer

Overall Summary: we cannot learn enough from the POP measurements in HAM1 to constrain the values of PR2 and PR3.

We double checked all the distances reported from alog 84307 and the distances of the POP lens in the model, and we found a 3(ish) cm discrepancy. We corrected this discrepancy before doing any fitting or analysis. We use the portion of the measurements in front of the POP lens (towards the POP LSC diode),  as they contain enough information at each Gouy phase region in the beam evolution, to fit for a q-parameter in front of the POP lens. We can propagate this to where the other measurements are behind the POP lens to get an understanding of the focal length of the POP lens. Figure 1 shows a plot of the fitted q from the portion of measurements compared to the ones not used.

We saw that this q-parameter was not well collimated behind the POP lens, making us think that the focal length may not be exactly what is in the model/reported. We adjusted the focal length by +2% (reducing lensing power) as is listed in the tolerance of the optic (see D1300313), and found much better agreement with the un-fitted measurements. This is shown in Figure 2, which shows that the overlap with the measurements before the POP lens is better, but the overlap with the model q-parameter is not as good as we would like.

We then increased the radius of curvature of ROM RH3 mirror (in HAM3) by +1%, and saw that the model beam becomes well overlapped with the fitted q-parameter fromt the measurements. This is shown in Figure 3.

Overall, I think this tells us that because we can tweak the parameters of the lenses in the POP path within their specs to give us the overlap we want with the Input mode through the PRC, we cannot use these measurements as a constraint on the values of the PRC telescope optics. It would be great if we could get a few beam profile measurements in transmission of PR2, without the POP lens or RH3 mirror but getting the IMC locked while HAM3 is vented seems unlikely.

[Joan-Rene Merou, Alicia Calafat, Sheila Dwyer, Robert Schofield]

We have analyzed the evolution of the near-30 Hz and near-100 Hz comb amplitudes, continuing with the work on aLOG 87414. In that alog was shown how there appeared to be a correlation between the ITMY ESD bias and the amplitude of the near-30 Hz and near-100 Hz combs.

In this study, we first listed all time intervals between ITMX and ITMY bias changes from the study Robert Schofield did and reported on aLOG 78925 and the associated entries. Robert changed the biases in a number of occasions "for determining the ITM biases that minimize coupling of electronics ground noise". We wanted to see if this was also true for minimizing the amplitude of lines in DARM.

The full list of constant-bias segments in-between changes is shown in the following table, which defines the start and end GPS times, along with the corresponding ITMX and ITMY bias values. We have added a few data points in between the ones shown in the related Robert aLOGs.


  

    

      
const_start_gps
      
const_end_gps
      
ITMX_bias
      
ITMY_bias
    
  
  

    
1403650000
1403651100
0
0
    
1403651220
1403653448
0
-39
    
1403653569
1403655679
0
170
    
1403655799
1403657640
0
-222
    
1403657760
1403804070
0
0
    
1403804192
1403804365
0
77
    
1403804489
1403807629
0
-80
    
1403807751
1403809555
0
-20
    
1403809816
1403812204
-40
-40
    
1403812324
1403816907
36
-40
    
1403817127
1403820880
36
0
    
1403821000
1403912193
0
0
    
1403912517
1403914518
20
-20
    
1403914684
1403917205
-19
19
    
1403917405
1404317823
0
0
    
1404317979
1404319278
-20
-22
    
1404319453
1404320829
20
-20
    
1404320940
1404341414
0
0
    
1404341526
1404342991
0
-20
    
1404343117
1404344533
0
-40
    
1404344655
1404346187
40
-40
    
1404346300
1404413221
0
0
    
1404413147
1404416077
0
-40
    
1404416200
1404417200
0
0
  


For each of these intervals, we performed custom Fscan analyses using DARM and the 5-26 ADC channel as input data with 128 s Tsft. Each Fscan job covered one of the constant-bias segments, allowing us to investigate whether higher ITM biases corresponded to larger spectral peaks in the resulting spectra. The attached plots show the relative amplitude of the first harmonic for the two strongest combs identified near 30 Hz and 100 Hz.

In these color scatter plots the X and Y axes represent the ITMX and ITMY bias voltages, respectively. The color scale encodes the relative amplitude ratio (or signal-to-noise ratio) of the selected comb harmonic. These plots correspond to DARM (GDS-CALIB-STRAIN-CLEAN).
From the visual inspection, there appears to be a consistent trend where higher absolute ITMY bias values correspond to larger peak amplitudes, the same could be true for ITMX values, but the data does not appear to be conclusive. It would be interesting to get data points with much higher absolute values of ITMX bias.
Here is one example for the first harmonic of the highest near-30 Hz combs:



Although these results currently refer only to the first harmonic of each comb, this correlation already suggests a relationship between ITMY bias magnitude and the peak amplitude.

We also generated the same set of plots for the H1:PEM-CS_ADC_5_26_2K_OUT_DQ ADC channel, to test whether the observed trend in DARM is also visible in the ground current monitor. From these additional plots, the correlation appears less clear. For the near-30 Hz comb. It appears that changing ITM bias values does not change the comb amplitude in the ground monitor. Showing an example for the same comb as before:



The current analysis only considers a single harmonic per comb. The next steps are to extend the study to higher harmonics of these combs and check whether the same behavior is observed in other comb families beyond the 30 Hz and 100 Hz series.