Closes FAMIS 27396. Last checked in alog 87787

Plots look fine compared to last week but BSC High-Freq noise is elevated for these sensors:

ITMX_ST1_CPSINF_H1
ITMX_ST1_CPSINF_V1
ITMX_ST2_CPSINF_V1   

Note - it is Tues Maint. so there are people in the LVEA.

There was a 7.5Hz peak in TJ's last-week check that is now gone. It was most prominent in HAM1 it seems.

Pdf Attached.

Tue Nov 04 10:05:35 2025 INFO: Fill completed in 5min 31secs

Gerardo confirmed a good fill curbside.

Randy and I installed new CR ceiling.

Betsy had a local company fabricate a C3 ceiling for our Mega Cleanroom. This ceiling has velcro opening to allow access for Septum removal. Opening extends to end of CR opening on the -X side and ends just short of the +X opening. 

I've removed the Misaligned states and their associated edges for the IMs and MC1 nodes to avoid a similar mishap from last week (alog87793) of going up to 60W but misaliging optics that should not be moved at that power.

To do this I needed to make h1 versions of these nodes. Most other sus nodes are common, and these do use the common SUS.py file, but we redefine the edges and removed the misaligned and misaligning states.

The quarterly maintenance of Chiller 3 and pump at the Corner Station has been done. Additionally, all chillers site-wide have been rotated. 

TITLE: 11/04 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 8mph Gusts, 5mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.29 μm/s 
QUICK SUMMARY: Violin modes are very rung up, although our violin monitors dont agree with that. Our range has been very low for the past 2 hours, as if the squeezer isn't squeezing. While the magnetic injections are running right now, I don't think they are getting anything useful. Still trying to figure out what's going on.

Maintenance day today. 

Workstations were updated.  This was an OS packages update.  Conda packages were not updated.

TITLE: 11/04 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Aligning
INCOMING OPERATOR: Oli
SHIFT SUMMARY: One lockloss, we are relocking at MAX_POWER.
LOG:                                                                                                                                                                                                                                                                                                                                                            

03:45 UTC Something started to ring up in the DCPDs and the 500Hz line looked large on DARM. None of the vioins were ringing up though, I eventually found that both ETMY and ETMX (mostly ETMX) mode1/6's drive was ringing up and once I turned off the damping the DCPDs came back down and so did the line on DARM. (tagging SUS). I then put the nominal gain back into ETMX mode6 and it started to damp back down.

04:03 UTC We dropped observing, I brought us to Hi gain ASC as a semi large earthquake from Eastern Russia was hitting us (6.0)

04:19 UTC lockloss from the Earthquake

04:55 UTC MC2 M3 tripped as the IMC was trying to relock after a lockloss from FIND_IR, a look at some of the OSEMs

04:56 UTC IA, after INPUT_ALIGN it took the IMC 6 minutes to relock itself

04:19 UTC lockloss from a 6.0 from Eastern Russia, we were in the Hi gain ASC state at the time trying to ride it out.

M. Todd

I ran ISS injections in several bands during commissioning today (1-20 Hz) until about 9:30 PT. I am still struggling to get coherence below about 4 Hz, but the measurements of the transfer functions match relatively well with models of the ISS couplings to different ports in the IFO, except for POP. This could be sideband dominated dynamics, but more thought is needed.

1. Model of ISS coupling to IFO ports with radiation pressure
2. ISS to AS_C measurement
3. ISS to POP measurement (discrepancy with model)
4. ISS to REFL measurement
5. ISS to TRANS measurement 

TITLE: 11/04 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 149Mpc
INCOMING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 6mph Gusts, 4mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.36 μm/s
SHIFT SUMMARY:

Lockloss from NLN , Lockloss tool failed again.

Thefirst channel that I was able to see deviate from its nominal operation was ETMX L3 channels.
screen shot attatched.

Relocking notes: 
Relocked after another IA that unlocked and faulted the IMC after Saturating MC2. Doing a manual IA does not cause this issue.
Once passed DRMI, it locked without issue until NLN where the 1 hz ring up happened on the ASC-INP1-P. Elenna had me use the ASC high gain button for about a minute.
Once that had properly damped the oscillation and used the ASC Low gain button we were able to do some Observing.
Observing reached at 00:15:01 UTC

LOG:

TITLE: 11/04 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 147Mpc
OUTGOING OPERATOR: Tony
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 3mph Gusts, 1mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.44 μm/s 
QUICK SUMMARY:

• Secondary microseism has decreased over the past 12 hours
• We've been locked for ~ 20minutes
• 00:15 UTC Observing

At about 1100 PST I swapped the fiber pair for Ethernet IPC testing from the MSR in the corner station to EY.  The new 4k pair is connected via patch fiber 24 at EY, replacing patch fiber 33.

FAMIS 31110

The PSL was restarted on Thursday following an interlock trip and the PS3 pump current was increased (alog87866). Since then, AMP2 power has been very slightly lower, but so has PMC reflected power. ISS diffrected power has been low the past couple of days as well.

Lockloss at 18:37 UTC Lockloss tool seemed to failed.
There was an unknown lockloss during commissioning.
Related Lockloss scopes attached.

Relocking notes: 
Initial_Alignment  railed MC2 in PRC aligning again today, twice. This perhaps is the start of a trend?
I just ran a manual IA.
After that relocking was pretty fast.
I accecpted some SQZr SDF changes to get back into Observing. Tagging SQZ. 

Got back to Observing at 20:39:50
Superevent candidate S251103f  
 

Mon Nov 03 10:11:37 2025 INFO: Fill completed in 11min 33secs

Gerardo confirmed a good fill curbside.

The ETMX Hardware Watchdog started showing activity again around Wed 20oct2025. This does not appear to be related to any maintenance or Satellite Amp work. As the plot shows, its activity is very closely correlated to the IFO lock state, this was not the case earlier this year before it went quiet.