The JAC heater turned on at 8:00 PM PT. JAC-HEATER_POWER_SET is set to 3.

• TITLE: 03/14 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
  STATE of H1: Planned Engineering
  INCOMING OPERATOR: None
  SHIFT SUMMARY: I touched up DRMI alignment but we're still having issues with DC centering.
  LOG:  

• 01:20 UTC Oli and Jennie report that one of the light bollards in staging upper (the one closest to the stairs) shorted out, gave off a flash of light, a noise and started to lightly smoke. I informed Tyler who took a look using the remote cameras and determined its probably ok for the weekend, but he'll check up on it again.
• While we were locked in DRMI I maximized the power with BS, PRM, and SRM. I was only really to make any gains with PRM_P.
• "WFS DC centering railed" ISC_DRMI, I couldn't get the DC centering loops to turn on and stay on, PM1 was just railing constantly. I found an alog from Elenna with a possibly similar situation alog84782. The codes says its only checking DC1,2,3,4 at this stage and none of those are showing OUTPUTs greater than their LIMITS, only DC6 was showing OUTPUTs > LIMITS and the  section of ISC_DRMI wfs_centering for REFL_AS should only check DC1,2,3,4, I'm not sure why its trying for DC6 (PM1?). I tried greatly reducing the gain, even setting it to zero for DC6 to no avail. 
• 02:12 UTC I went DOWN and tried to come back up, it went quite quickly, ALS locked quickly on its own ( I reupped the gain on the TRX), IR went great then we locked DRMI within 3 minutes of entering the state ( I didn't raise any of the POPAIR or REFL RF gains) to get stuck by the WFS DC centering railed again. I now tried to reduce all the gains of the DC loops, turning DC6 to 0. After a few minutes  ISC_DRMI was able to complete its DRMI_WFS_centering state that it had been stuck in, ISC_LOCK went into up to ENGAGE_ASC but we were constantly saturating RM1 with verbal calling out HTTS
• 02:35 UTC DRMI locked instantly this acquisition (without increasing the LSC gains again), I played with the gains on the DC loops, increasing DC2_Y from -3.5 to -4.0 allowing us to get past the centering, the RM1 HTTS sats started again after we entered ENGAGE_ASC until we lost lock when PRC1 started.
• 02:47 UTC DRMI unlocked, and I put us into IDLE for the weekend

Pumpdown continues on HAM1 and it is progressing.  The chamber is currently being pumpdown with the SS500 cart aiding the turbo pump up on top of the chamber.  We are very close to opening the ion pump for this chamber.  Vacuum pressure is currently at 8.95x10^-07 torr.  The aux carts to pumpdown the annulus for both chamber HAM1/2 were disconnected Monday, see aLOG entry 89440.

I used a power meter to measure the power consumption of a Gamma ion pump controller (Digitel MPCq type) to power the 1200 l/s ion pumps (this one located at Y2-8), I concentrated on startup of the controller, then on startup of the high voltage (7kV) for the ion pump..

During the initial startup of the ion pump controller the consumption goes up slow, it creeps up to 12.04 Watts max, then it drops a bit after.  The second part of the test was to see the consumption spike when turning on the high voltage for the ion pump, for this test the meter immediately goes up to 40.69 Watts, then after a few seconds the power drops slowly.

A side effect of running this test can be appreciated on the attached trend data, because we powered off the ion pump the vacuum pressure internal to the main volume went up, it can be appreciated by the gauges along the Y-End station as well as Y2-8 gauge.

To do the test I powered the unit off and back on 3 times.

Sheila, Oli, Jennie, Tony, Ryan Crouch

Summary: Today we found that the 9MHz modulation depth was low because of a wrong setting, and that the beam was misaligned on the LSC REFLAIR A diode. After these changes and some gain adjustments we were able to lock DRMI.  

Details:

After restoring the 9MHz modulation depth this morning (89497), we went on to locking PRMI, using the notes from 89491, but scaling for the increased modulation depth.   Once it was locked, Oli and I went to ISCT1 to double check the alignment onto the POPAIR diodes, we slightly improved the alignment onto POPAIR A, but POPAIR B was already well aligned.  We measured 0.55mW in the POPair path before the splitter using a power meter. 

Oli phased POP18 + POP90 to maximize the I ERR signal with PRMI locked, and we put a 132 Hz, 3000 count exitation into PRM LOCK L to phase REFLAIR 9 and 45 to minimize the PRM signal in Q.  (userapps/lsc/h1/templates/phase_REFLAIR.xml)  We then adjusted the gain in REFLAIR 9 to match the ugf to the PRMI reference (screenshot).  In O4, we used a whitening gain of 12dB and then a digital gain of 0.25 before the phase rotation, and LSC input matrix of 1.75 .  Now we are using 30dB of whitening gain and a digitial gain of 4.4 to reproduce the same ugf (input matrix unchanged 1.75), so we are missing a factor of 140 signal strength compared to O4.  For MICH the ugf is also right on the reference, screenshot.  This is with 30dB of whitening gain and a digital gain of 4 before the phase rotation, compared with 0dB of whitening gain an a digital gain of 1 in O4, so this signal is too small by a factor of about 126.  So this is pretty similar to the signal loss for REFLAIR 9.  

Oli and I went back to ISCT1, removed the ND filter, and realigned reflair A.  This gave us 2.5 counts on REFLAIR A LF, and we were able to relock PRMI with the whitening gains for REFLAIR back to normal.  We adjusted the phase of reflair, and added some digital gains to set the ugfs to what they used to be.  

A comparison time with PRMI locked in November 14th 2025, 22:23:00 UTC

We ran SRY alignment manually, (the WFS don't work since we have not rephased them).  

This screenshot shows the gains I had manually adjusted when we got a 3 second DRMI lock, March 13th at 23:28:21 UTC.  

DRMI locking references: trigger levels: 44348  filter states and loop measurements: 87768   When DRMI grabs for a few seconds, it looses lock due to a 20Hz oscillation (screenshot), which suggests the MICH gain is too high.  I tried a few changes to MICH gains.  In this grabbing attempt, it seems that the MICH filter changes are what is making things unstable.  

Edited to add: We have locked DRMI, with three manual changes, to the POP18 digital gain (set to 3 as in screenshot), RF9 gain set to 0.31, and RF45 gain set to 2.17.  We think that this was too high for RF45, and instead it should be left as SDF will set it at 1.  We stepped through the DRMI_locked guardian state manually which was fine.  

I added a check for the JAC shutter to the 'LOCKING' state to its guardian. This was because it was closed when the guardian was trying to lock JAC this morning and it took us a while to figure out.

We haven't had a chance to check this today due to efforts to lock DRMI but I will check it on Monday.

Its on lines 207-209 of the script.

 if ezca['SYS-MOTION_C_SHUTTER_M_STATE'] != 0:#added to notify if shutter closed. J Wright 2026-03-13.
            notify('Shutter closed. Check shutter trigger values.')
            self.timer['waiting'] = 5

Thanks to Tony for helping me debug gedit.

Control room

RM2 SWWD has been bypassed temporarily until we offload some of it since we're near the end of the ADC range for one of the channels.

The ADC reaching the end of its range isn't what actually caused the trips though . The HAM1 ISI SW watchdog tripped after being triggered by RM2's LP SWWD. It looks like the LOCK filter bank integrators had started raking up counts, eventually causing large oscillations in the suspension that surpassed the LP SWWD threshold. The integrators for RM1, RM2, and PM1 all started building up at the same time, but for whatever reason the build ups on RM2 were much larger.

Jim says that he doesn't care for the HAM1 ISI whether any of the little tip tilts on there trip, so we're bypassing RM2 for now since its the closest to tripping.

Took a picture of the pumpout port for each of the cryopumps.

The attached pictures below are from CP1 to CP8 from left to right.

Jennie W, Sheila D,

I compared the RF monitor values for POPAIR and REFLAIR LSC photodioes between today during state 51 "PRMI LOCKED" and 2026-11-14 22:28:00 UTC in state 50 "ACQUIRE PRMI".

Note we re-aligned both POPAIR B and REFLAIR A yesterday.

POPAIR A RF9 and RF45 have not changed much.

POPAIR B RF18 and RF90 have reduced a lot.

As have REFLAIR A RF9 and RF45.

REFLAIR B RF27 and RF135 have gone up instead of down which seems less worrying for locking purposes.

After this Oli and Sheila re-aligned REFLAIR A (detailed in Sheila's log 89501).

The SUS-AUX models have filtermodules, and until now the MEDMs for these have not been easily accessible.

With help from AI, I have written a python program which produces a set of MEDMs to permit navigation down the SUS-AUX tree to open MEDMs which display the filter modules.

To open the top level screen, which lists all the susaux models, a "SUSAUX Filters" button has been appended to the SUS pull down in the systems section of the SITEMAP (first attachment).

The second attachment shows the resulting FM screen when navigating from h1susauxb13 -> ITMX -> L2 -> NOISEMON

TITLE: 03/13 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: Ryan C
SHIFT SUMMARY:
The Commissioning crew today were focused on trying to get PRMI locked and stable for most of the day. Thye touched up the REFL A alignment which helped. 
But there seems to be some power lost somewhere.

This spreadsheet was created to document the difference in the ratio of  IMC Trans power/IMC input power back in the O4 run and now.  Specifically when the PSL is set to 2 Watts. Feel free to update this in the future.

 The Gain for H1:ALS-C_TRX_A_LF_GAIN has been bumped from 1.5 to 3 to get past FIND IR without issue.
This may not be the only gain that has been turnt to 11 to get DRMI to almost lock today,  Sheila will be posting an alog later with some laser power acounting that may shed more light on that situation. Yes the Pun was intended.

LOG:                                                                                                                                                                                 

TITLE: 03/13 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: Tony
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 6mph Gusts, 4mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.21 μm/s 
QUICK SUMMARY:

• We've locked PRM a few times, working on aligning SRM / the SRC right now

There was a conda update on control room workstations to update ndscope from 0.20.7 to 0.20.8.

The new version fixes a bug where old data could be left on the plot when changing the time window if there was no data for that window from NDS.  Thanks to Jenne for finding this bug.

It also fixes a bug where HDF5 and Matlab exports might be empty, and improves messaging around exports.

Fri Mar 13 10:15:08 2026 INFO: Fill completed in 15min 4secs

Tony, Filiberto, Sheila, Jennie Wright, Oli

This morning we tried to do an OMC scan to check the modulation depths.  The OMC high voltage was off, Filiberto found that the supply was powered on but the output disabled, so he enabled it.  

We used 10W input power single bounce off ITMX.  I compared this to a reference from 65828, it seems as thought the 9MHz is too small. 

Jennie Wright checked modulation depths in 89456, at that time the EOM driver was set to 27dBm for 9MHz, on 10 am on March 10th it was set to 23.4dBm.  This was in SDF as 23.4dBm, but this channel is not monitored and this table is not in SDF revert. ISC_LOCK prep for locking sets these values because they get changed in low noise, I've changed it in lsc params now.  

TITLE: 03/13 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: EARTHQUAKE
    Wind: 5mph Gusts, 3mph 3min avg
    Primary useism: 1.02 μm/s
    Secondary useism: 0.21 μm/s 
QUICK SUMMARY:

Site is wet, wind is low.
When I walked in there was an active 6.3M earthquake rolling through from Chile.
I'll give the earthquake about 10 more minutes to roll on through then start locking green arms and PRX for the comissioners.
 

TITLE: 03/12 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: Corey
SHIFT SUMMARY:

Jenne/Jennies locked pseudo-PRMI earlier in the shift.  Ran trend plots of sus for comparison between today and Nov2025 (see Jenne's alog).
LOG:

• 2346 Grabbing laptop (sophie)
• 0002 Jenne had PRMI locked for about a minute!
• 0318 Closed the HAM6 shutter due to OMC Trans increasing on nuc31

[Sheila, Jennie, Jenne, RyanS, Corey]

We have been able to get PRMI locked (with arms held off resonance using ALS).  To do this we:

• Increased POP18 analog whitening gain, and redid its dark offsets
• Phased POP90 by -180 deg.  RyanS noticed that POP90 was flashing negative, when it should have been positive.  We realized that POP18 was fine because the RF9s didn't need rephasing with the new EOM, but the RF45s needed to be phased by 90 degrees, so the RF90 would need a 180 deg phase.
• Increased REFLAIR_A_RF9 analog whitening gain. No dark offset change needed
• Increased REFLAIR_A_RF45 analog whitening gain and adjusted dark offsets.
• Took the ratio of REFLAIR RF peak heights now vs a time with the same IFO config on Nov 16th 2025, and increased the MICH and PRCL LSC input matrix values by those ratios.
• Jennie calculated what the updated MICH LSC trigger thresholds should be, but with the whitening gain up on POP18 we ended up being okay with the default from guardian.

PRMI locked without too much fuss.  Since we've effectively also increased the noise on the error signals, it's a bit delicate, and I lost lock twice while touching up alignment. The third lock I was able to go a bit slower when touching up BS and PRM alignment, and we've now been locked for more than 20 mins (aka infinity).  Jennie is taking PRCL and MICH OLGs.

The attached image shows all the things that I had changed. 

• POP18 analog gain to 45dB
• POP18 dark offsets
• REFLAIR_RF9 analog gain to 36 dB
• REFLAIR_RF45 analog gain to 30 dB
• REFLAIR_45_Q to MICH input matrix element to 22.7 (5.6x times default of 4.0)
• REFLAIR_9_I to PRCL input matrix element to 18.6 (10.6x times default of 1.75)

Nothing is in guardian (except maybe some trigger thresholds which should be reverted), and nothing is saved in SDF. 

[Tom R, Ibrahim]

We glued 6x of the QOSEM flags, attaching the lens (D2500277) to the aluminium body (D2500253). This was done using a jig (D2600054) to ensure the lenses were aligned to the body of the flag. We used EP30.

Only a tiny drop of glue is required, and was applied directly to the lip of the body using a thin wire. The flags will be left to dry overnight before another batch of 6 will be glued.

Jennie W, Keita K, Rahul K, Ryan S,

This morning Keita turned the power up to 1 W and the purge air down in order to scan the OMC and measure the modulation index.

We had some work to do to lock the JAC, the cavity wouldn't scan properly when managed by the guardian code.

Ryan and I have looked back at it and think there may be something wrong with the feedback to the PZT. It can't be the PZT itself though, because Keita and I were able to lock on the TRANS PD signal with the dither locking done manually by tuning the PZT offset to find the resonance and then turning on the feedback.

I have enclosed a picture to aid problem solving next week.

We then had problems keeping the IMC locked so Keita had to change the threshold used to check if the cavity is locked down to 2. This was changed at line 133 in ISC_library.py at userapps/h1/isc/guardian/.

trans_pd_lock_threshold = 2

We then managed to do three scans,

one with 45 MHz off, one with both on, and one with 9 MHz off. Detailed analysis in progress.

After turning the power back down Keita and Rahul swapped the mirror we currently have in front of the TRANS PD, with the uncoated laser window that is meant to be there (JACT_BS1).

They had to top gun and swab it to remove two dust particles first.

This replacement means the power to the PD is lower and so we needed to power up to 1W to check this alignment.

I have left the mirror we took out on the table on the -Y side labelled as 'HR mirror taken out of JACT-BS1'. Need to check which exact mirror this is with Masayuki on Monday.

Keita locked the cavity manually with the REFL PD and optimised the amount of light falling onto the TRANS PD.

I powered down to 100mW and de-energised the rotation stage and closed the light pipe at the end of the day. We also had the rotation stage de-energised and locked out when we were working in chamber.