This morning while Corey and the commissioning team were trying to lock and power up the interferometer, the violin modes were pretty rung up. For most of the modes, I was able to damp them down using nominal settings except three of them which are listed below along with the settings which seems to be working for now. 

• ITMx mode 3 - FM1+FM9+FM10 Gain = -20 (+60 deg phase)
• ETMY mode 1 - FM1+FM6+FM8+FM10 Gain= -0.1
• ITMY mode 05 and 06 - FM6+FM7+FM10 Gain = +0.01 (-30 deg phase)

FAMIS 31088

No major events of note. The slow changes in PMC TRANS and REFL power seem to follow AMP2 output power.

TJ, Camilla, Checking as Sheila was concerned about this as Georgia/Craig need to move the ITMX SPOT GAIN "CENTER" 84702.

Attached are the HWS Live plots comparing when we get to 10W and 120s later for ITMX and ITMY now. And also for ITMX and ITMY at our last 10W power up before the vent (note that then we don't pause at 10W and continue increasing power during the 120s). 

Can see no obvious new point absorbers, ITMY looks perfect and ITMX has the same point absorbers as before, it;s possible there's a new point absorber on the right of the optics (orange arrow in attached) but it doesn't look scary. We will continue to check this but it's possible that our alignment has just changed (has since 66198) so that we can now see this point.

HAM1 annulus system appears to have issues pumping down, currently its annulus ion pump is railed 10 mA, and the pump cart pumping on this system is sitting at 6.04x10^-05 Torr, see attached photo.

Process thus far:

• Last Thursday I managed to go and visit some of the -Y door bolts, found out that most of the bolts from 3 to 7 O'clock were not tigth, I was able to get 90 degrees turn, one bolt was actually loose, I was able to turn it by hand, but those were the only one that I was able to work on, since I was asked to stop work at HAM1.
• Another test done was to check for leaks on the aux cart pumping line, so the cart was isolated via the annulus system isolation valve, the pressure dropped at the aux cart down to 4x10^-06 Torr, meaning that no leak is on the pumping side, the isolation valve was opened again to continue pumping.

I plan to visit HAM1 to check the rest of the bolts on -Y door and +Y door.

Mon Jun 02 10:12:16 2025 INFO: Fill completed in 12min 13secs

Gerardo confirmed a good fill curbside.

M. Todd, C. Cahillane

Yesterday we were interested in some noise we were seeing around 6Hz in various ASC signals (mostly CHARD pitch). This motivated us to look at the RMs, so I took a PSD of each DOF for both RMs.  We are not sure why there are such differences in all the dofs, and if there are unintended side-effects to this.

I'm specifically wondering why RM2 has larger peaks around 6.25 Hz in all dofs...

Camilla, TJ

Sheila asked us to look for post vent point absorbers, but when we went to check, we found that the code hadn't been running since May 23rd.

Looking further into it, we could log into the machines and open the tmux sessions, but the code was frozen from May 23 821UTC and could not be Control C'd. I then tried a pkill on that python process, this also did not work. Trying to reboot the machines remotely aslo didn't work. I power cycled the machines from the MSR, then we were finally able to start the code up. ITMX needed the camera initialized for some reason.

We are thinking about ways to catch this in the future, maybe having DIAG_MAIN monitoring if values are updating properyly.

TITLE: 06/02 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 15mph Gusts, 8mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.22 μm/s
QUICK SUMMARY:

H1 was down for the night, so will most likely run an alignment and then go for Power 10W and then assess.

• Edit#1:  While dropping off some yogurt in the fridge I came back to ALS_YARM in a STALLED state (which appears to be a norm as of late).  Rerequested INITIAL ALIGNMENT and it was fine.)
• Edit#2:  Also had Stalls while trying to get to PRX_LOCKED, but TJ arrived and I let him know about this and he mentioned this is because we are doing MANUAL ALIGNMENTS (this won't happen when we return to our usual Initial Alignments)

TITLE: 06/02 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: TJ
SHIFT SUMMARY:

IFO is in DOWN and in PLANNED ENGINEERING

Productive day in which we made it past 25W before a violin-mode gain related lockloss.

The lockloss kicked our alignment so I did a manual initial alignment, which worked to lock DRMI. We can now semi-reliably get to powerup automatically. The goal now is to continue powering up while monitoring IFO status.

For details, check out alog 84706, alog 84702

LOG:

Just a brief note on the CHARD P error signal.
When fitting an excitation for injection, I noticed a large peak at 6 Hz that I hadn't seen previously.  
I'm guessing it's from RM damping but I'm not 100% sure.

I went back to a NOMINAL_LOW_NOISE time from last March 12, 2025, to compare what we had before.  
There seems to be a number of differences.

There's some large broad peak around 16 Hz in March 12 that's no longer there now.
I checked a couple of times in that March 12 lock at this broad 16 Hz lump is always there.

The 6 Hz peak is much larger now, but there appears to be a small peak there even in March.

Not sure the causes of such differences, but someone who knows more about the HAM1 changes could have better insight, especially related to the ISI upgrade and status of the RMs.
The comparison is not fair either, since we are only at high noise, 20 W of input power now for June 01, whereas in March we had NLN and full power.

 

Closes FAMIS 26455. Last checked in alog 84145

Trends are within red error lines. Seems that there were 3 spikes week of 05-11 to 05-18 which can probably be attributed to vent work, but I am unsure.

Closes FAMIS 26386 and FAMIS 26384 and FAMIS . Last checked in alog 84405,

Everything is under threshold. Took 2 weeks since was undone for the week prior.

Corey, Ibrahim, Georgia, Craig, Matt, Caroline, Julia

Corey locked the interferometer after the earthquake.
We were pretty much able to go directly to CHECK_VIOLINS_BEFORE_POWERUP without touching anything.  
Corey did tidy up the 2f signals by adjusting PRM and SRM alignment after DRMI locked, but the other guardian states "just worked" after our changes from last week.

We went up to POWER_10W, no problems there.
Then we started stepping through POWER_25W.
We ended up losing lock after upping the ADS gain from 1 to 2.

It was a very slow lockloss, which seems consistent with this story about it being ADS-driven.
We also had just turned on the SOFT Y loops to high gain (20 for CSOFT Y, 30 for DSOFT Y).
Georgia looked at the ADS control signals and it appears to be the PIT loops which killed the lock.

The above lock was with the ITMX SPOT GAIN at it's new "CENTER" value of -1.25, rather than 0.85.
We figured that since we MOVE_SPOTS soon after anyways, we can focus our efforts on trying to get up to high power with ASC relatively stable.

EDIT: We lost lock after going up to POWER_25W from what was probably that same very slow 0.02 Hz oscillation.  See picture 2.
Leaving the ADS pitch loops on at only a gain of 1 was not good enough.

Georgia added back in +10 dB to both PIT3 and YAW3 for the ADS which was commented out a few days ago while we were sitting at 2W CHECK_VIOLINS_BEFORE_POWERUP.  
This caused a lockloss when going up to POWER_10W.
This indicates it's just ADS PIT3 which is the major problem here.

EDIT2: We are sitting here at 20 W of input power, measuring CHARD P for an hour.  
We turned off ADS PIT3 while going up in power, with the plan of trying to ease it on at lower gain. 
While we were sitting here measuring, the 0.02 Hz oscillation came back.
Georgia stopped it by lowering the PIT4 and PIT5 gains from 1 to 0.1.

EDIT3: We tried to MOVE_SPOTS, but lost lock after about 8 minutes due to a violin mode damping typo.  
Georgia lowered the ADS gains to 0.1 for all, including PIT3 starting at the weird spot position on IX.
The buildups were getting very choppy, but we were surviving.  Unclear how far we could have made it.
Julia was damping violin modes and accidentally typed in -20000 into a filter module gain, which seems to have immediately saturated the IX PUM stage and killed the lock.
This is Julia's first lockloss so we will be nice to her this time.

Changed the DARM_OFFSET ISC_LOCK state number to be in order, after ENGAGE_ASC_FOR_FULL_IFO

TITLE: 06/01 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: Ibrahim
SHIFT SUMMARY:
After alignment and taking H1 up in ISC LOCK, Syracuse crew arrived and covered various items:

• Addressed issue with OMC PZT voltages.
• Looked at phasing for the new POP X WFS

Guardian Note:  ALS_YARM needs a mindful eye, because it was frequently go into a (yellow) STALLED state.  To "unstall" it I just reselect the state it is in.  Can't recall if this has been happening with other nodes.

LOG:

• 1445-1523 Morning Alignment (Notes alog 84695)
• 1524 1st Lock of the day in the morning (Notes alog 84696)
• 1615 Team Syracuse arrives!  
  • They took care of the issue with POP X message on DIAG MAIN,
  • Started looking at why the OMC isn't locking--due to high voltage power supply.  This allowed us to go to DC Readout
  • Then stayed at CHECK VIOLINS BEFORE RAMPUP to start various measurements such as
    • Looked at phasing for the new POP X WFS
• 1650-1705 Went out to the LVEA to check OMC PZT chassis & power supply (craig, georgia, corey)
• 1907 Lockloss
• 1908 M6.0 Japan EQ notification & EQ Mode at 1923
• 1934 Manual Alignment while the R-Wave passes (eventhough DRMI did have decent flashes up to 100...but it was 10min of no lock).  So paused for a  bit since the Y-Arm is being its usual difficult self.
  • Just a note on Y-Arm locking---even with flashes of 1.0, it was hard for it to stay locked with the EQ rolling through + EQ Mode Activated (X-Arm was fine, aligned and stayed locked the whole time).
  • 1953--this is when Manual Alignment started (as SEI ENV returned to CALM [from EARTHQUAKE]).  Only other note is that SR2 alignment-by-hand was not needed (as it was this morning).
• 2008 2nd Lock of the day (after EQ & lunch)
  • Much more smoother.  DRMI locks within 2-minutes.
  • And for this lock, Craig/Georgia said we can skip some of the "pauses" noted in this morning's lock (alog 84696)
    • I did stop at DRMI LOCKED PREP ASC to try tweaks of PRM+SRM to maximize+flatten POP18, but it didn't really need any adjustment.
    • So, Ibrahim took H1 all the way up to 10W with no other pauses (currently, the team is Adjusting Power for a slow power up to 25W while watching ASC).

TITLE: 06/01 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 11mph Gusts, 4mph 3min avg
    Primary useism: 0.12 μm/s
    Secondary useism: 0.13 μm/s
QUICK SUMMARY:

IFO is LOCKING in PLANNED ENGINEERING

While we just got hit by an earthquake, locking has been fairly straightforward.

The plan is to power up slowly after 10W since we are able to automatically get through ENGAGE_ASC_FOR_FULL_IFO.

Georgia, Kevin, Corey, Craig, Matt, Caroline, Julia

First thing done was to turn off the ADS PIT3 Pitch loop, as we still have a massive offset on IX SPOT GAIN.  Plan is to remove this before going up by walking the alignment.  We'll check the phasing of the REFL WFS as well.
INP1 P is on REFL 9 I, while CHARD P is on REFL 45 I.

OMC is not actually sweeping, and so is not locking.
Georgia has found that the PZT2 monitor is not reaching the high voltage levels that it usually has during OMC_LOCKing. 

We went to the mezzanine and found the HAM6 PZT driver power supply was stuck in constant current mode (first pic).  
Georgia flipped it off and on and it fixed itself (second pic).
Now the OMC is locked again.
Someone serious should look at this.

Started to phase POP X WFS using a frequency line at 8.125 Hz.  We engaged all the Notch8 filters.
All POP X segment phasings are around -23 degrees or so.
We were unable to put all the signal in I using the frequency line. 

Then we switched to using PRC2_P_SM_EXC for the injection line.
This was a lot more fruitful.  Matt and I rephased segments 3 and 4 to reduce the PRC2 P signal in Q.
The phases are pretty different between segments, but overall they are close to what they were before...
These changes were saved in SDF.

We reset the IX SPOT GAIN to 0.85, which put the ADS PIT3 error signal back to around 10.
Our problem is if we zero this PIT3 error signal with the current alignment, we lose buildups and eventually kill the lock. 
Our goal is to walk the alignment to zero this signal without losing lock.
Georgia opened INP1 P, which control IM4.
Julia and Georgia are walking IM4 and PRM together now, with PRC2 and CHARD P closed to try to point us back on the center of the ITMs for powering up. 

We lost lock while walking IM4 P in the negative direction, and recovering with PRM.
We were about to switch directions we were walking in when we died.

M. Todd, C. Cahillane, S. Dwyer

I ran another estimate of the PRG, following Craig's method in alog  58327, and estimate it to be around 54.2 W/W.

I compared the TRX power to Input Power ratio during the FIND_IR state versus the PREP_ASC_FOR_FULL_IFO state, with the PRM transmission as a normalization factor.

                       TRX_POWER_FULL_IFO  /  INPUT_POWER_FULL_IFO
PRG   =    -------------------------------------------------------------------------------------
                     TRX_POWER_FIND_IR   /  (Tp  * INPUT_POWER_FIND_IR)

I've attached the quick script I've used for the interesed reader.