Fri Mar 06 10:17:49 2026 INFO: Fill completed in 17min 45secs

Gerardo says "long fill due to change of configuration, GVs are open"

Summary

The JAC cavity was locked in vacuum for the first time. Alignment was performed using the JM1 suspension and PSL PZT scan. After lock acquisition, the demodulation phase was optimized and a new Guardian state (NORMALIZE_SIGNALS) was implemented to automatically normalize several signals based on a slow PZT sweep.

Details

First in-vacuum lock

• The JAC cavity was successfully locked in vacuum.
• Prior to lock acquisition, the cavity alignment was adjusted using JM1 suspension and PSL PZT scanning.
• The PSL PZT was scanned with a 10 s period, and the alignment was tuned so that the TEM00 peak became dominant.
• After locking, the alignment was fine-tuned by maximizing the transmitted power.

Demodulation phase optimization

• A 300 Hz excitation was injected into L_SERVO.
• The demodulation phase was adjusted to minimize the signal appearing in the Q phase.
• The optimized demodulation phase is 63.37° (MEDM value)

Guardian update: NORMALIZE_SIGNALS state

• A new Guardian state NORMALIZE_SIGNALS was added.
• In this state, a 100 s PZT sweep is performed and used to normalize several signals automatically.

Normalization steps

1. JAC_REFL_A_RF43 input offset
The median value of JAC_REFL_A_RF43_I/Q_IN1 during the scan is taken as the offset
The negative value is applied as the input offset.

2. PDH error signal normalization
The peak-to-peak value of JAC-L_SERVO_IN1 during the scan is measured.
The signal is normalized so that the peak-to-peak becomes 1, by setting
REFL_A_RF43 filter gain = 1 / (max − min). The normalized signal is shown in the attached plot.

3. PZT scan trigger normalization
The peak photocurrent during the scan is measured.
This value is written to the Beckhoff channel JAC-TRANS_A_DC_NOMINAL to normalize the current signal.

4. Normalization report
A summary plot is automatically generated and saved as
/opt/rtcds/userapps/release/ioo/h1/medm/plots/normalize_report.png
You can open the plot from the button in the bottom-right of the MEDM screen

TITLE: 03/06 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: EARTHQUAKE
    Wind: 20mph Gusts, 16mph 3min avg
    Primary useism: 0.34 μm/s
    Secondary useism: 0.18 μm/s 
QUICK SUMMARY:

• More alignment and commissioning work planned today
• We are still ringing down from a 6.3 from the Solomon islands

Jason and Jennie found that there's no digital signal coming out of JAC WFS DC no matter what.

I and Jason went to the floor, I flipped the gain switch of the WFS interface from low to high, but there was absolutely no response from any of H1:JAC-WFS_[AB]_SEG[1234]_INMON.

We confirmed that interface cables are connected from the IOT1 to the WFS interface (ISC-R1 slot U10), the interface is connected to the AA (ISC-C1 slot U30), and the AA chassis is connected to ADC5. These all agree with D1900511 floor wiring diagram. I even disconnected the cable coming to AA (ISC_373) and WFS DC signals didn't respond.

It seems that there's discrepancy between the floor wiring diagram and the model which was made according to T1100472 where JAC WFS DC signals are routed to ADC3 (see attached).

Good news is that RF channels are working.

As of now, the light is hitting WFSA and I was able to phase RF using an excitation injected into JAC PZT while JAC itself was locked. WFSB is dark now. 

S Muusse, C Compton

Alignment of the visible laser was completed on the X table. This means there is very little optical setup that is left to do before moving the tables into the LVEA and aligning the QPD pickoff when the viewports are ready! Still to do is to check beam pointing and size with the movement of L2 on the translation stage.

Feedthrough panels for both tables were constructed as per D2500305 and have been installed onto one of the tables. Currently, we are determining how the laser cables will be installed in the panel and the power supplied for the fan, visible laser and the flipper which will use some combination of the top 3 currently empty ports. The chassis are also being mounted on the racks that live under the tables. We are steadily progressing from testing into getting the electronics and cables in there forever homes before the tables are moved to the LVEA. 

[Jenne, Corey, RyanS, Jane Glanzer]

After EE fininished cabling ISCT1 and IOT1, Keita and I put up laser barriers to make the South Bay of the LVEA local laser hazard ("bifurcated"), so that both tables can be opened at will.  

Please pay attention to the signs on the laser barriers, and if the barriers are closed and / or the signs show Hazard, then wear laser safety goggles beyond the barriers.

The Vac team opened the gate valves, and we ran the baffle align scripts.  After the baffle align scripts completed, I did not touch ITMX again.  

Corey and I moved PR3 so that we could see beams on the cameras (we later reverted PR3's sliders), and moved ETMX and TMSX until we had nice TEM00 flashes.  We were then able to lock it and run then offload the ETM_TMS_WFS.  

With Xarm nicely aligned and PR3's sliders reverted, we had great transmission on ALSX and a familiar looking spot on the camera.  However we didn't see anything on the Yarm PD or camera.  So, I moved the BS until I could see something (also having increased the exposure of the camera so we could see the straight leakage beam), and then moved ETMY until we started to get flashes.  I aligned ETMY and TMSY until we could hold lock on TEM00, and moved the BS until we had ~max transmission on ALSY's transmission PD.  We then ran then offload the yarm's ETM_TMS_WFS. 

I then (since HAM1 is at much lower pressure than 10 mTorr) opened up the ALS light pipe, and went to check that the alignment on the table looked "reasonable".  Indeed, it looks reasonable, in that the PSL beam seems to go nicely through the SHG and is roughly centered on downstream optics.  However, we don't have good beatnotes.  I had a quick look at the beams headed toward the beatnote PDs, and at least one is easy to see that there are 2 distinct beams headed toward the PD.  I don't recall on the top of my head if this is the Diff beatnote though; if it is, then it depends on the BS alignment, so we likely want to hold off on doing any on-table alignment until we have a better idea of the BS alignment relative to the ITMs. 

At Sheila's suggestion, I also reset the green initial alignment references (SDF table attached just before accepting them), so that we have an easier time coming back to where we are now.  As usual, we'll have to re-reset them after we achieve full 2W lock.

In summary: ITMs were set with the BafflePD script.  Green ETM_TMS WFS were run and offloaded.  Nothing on IST1 was touched (yet), but it's clear that we'll likely need to do some on-table alignment.

Proposed next steps: Check BS alignment by looking at MICH (so, after JAC is locked, then IMC locked, then XarmIR aligned).  Then, consider aligning the ISTC1 beatnotes.  Then, lock the whole IFO!

First alog regarding BHSS!

Betsy, Mitch, Corey, and I moved the BHSS platform from the staging building to the optics lab. We wrapped it in foil and ameristat, and rolled it over on a cart.

Previously, Oli, Camilla, and I have prepped all the optic mounts for both BHSS and BHD optics. These mounts are all currently laid out on the optics lab table with cloths and foil. All the BHSS optics have been clocked to their correct angle using the clocking tool.

BHSS is placed directly on the clean optics table, no foil. Oli has staged 4" height optics to direct laser beam to the platform once we are ready for alignment.

Oli, Camilla and I today pulled first contact on some BHSS optics. We have successfully installed both PCX 333 lenses for BHSS platform (QPD-T-A/B-L1), the 7% 20 deg splitters (QPD-T-A/B-R1), one 50% 45 deg splitter (QPD-T-A-R2) and two BHSS HRs, 36-R1 and TRN-T1. All of these optics have labels (except 36-R1) so they can be distinguished. Serial numbers have been noted in the optics BOM.

These optics are currently mounted in a random place in the center of the platform so they can be kept clean.

Oli and I struggled to remove FC from two 50% 45 deg mirrors and several HR mirrors. Other mirrors were still dirty and needed to be recleaned. We will return to these optics later to re-FC to pull the original FC or clean off spots.

OMCs are still in their cases covered in foil on the same optics table. They were previously opened by Camilla, Jenne, Betsy, and I and confirmed by eye to look good. Begum mailed us 4 great DCPDs from the tested batch, these are still wrapped and bagged and in a tote in the optics lab.

OMC cradle prep is on hold while we wait for EP30 glue to arrive. Other to do items include prepping alignment tooling, finishing cable pylons, and removing FC for the remaining mirrors, etc.

Photos to come...

TITLE: 03/05 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:

The arms were opened up today! 

• And this afternoon, we started work on the green arm alignment and after about 2-3hrs Jenne got both arms aligned with WFS (not with spool cameras).  Woo Woo!  
• Alignment work on JAC in-air table also started in the afternoon.

I got pulled from my shift for a good chunk of the 2nd half of my shift, and so Ryan Short helped me out and will post about afternoon LOG of activities. 

LOG:

• 1551-1651 LVEA technical cleaning (nellie.kim)
  • 1654-1741 MY/FCES cleaning (nellie)
  • 1700-1807 MX cleaning (kim)
  • 1808 H2 room (kim)
• 1551-1603 Hauling parts into East Bay (randy)
• 1605-1632 EY cleanroom curtains (randy)
• 1644 First Contacting BHD optics (camilla)
• 1710-1735 Unlocking HEPI of BSC2 (jim)
• 1723-1729 Checking HAM1+7 (travis)
• 1720-ish Cabling up ISCT1 & IOT1 (marc.fil)
• 1739 tour (kissel)
• 1751-1807 IOT1 work (daniel.jennie)
• 1753 CHETA table alignment (sophie)
• 1806-1809 grabbing a dust monitor in cer (ryanC)
• 1806-1816 checking elevator arm in east bay (randy)
• 1813-1822 turn off turbo H7 isolate aux cart H2 (jordan)
• 1815 wipe off optics table for BHSS in optics lab(oli)
• 1820 chatting w/ fil at isct1 (richard)
• 1830-2000 Moving BHSS from Staging to Optics Lab (elenna,mitch,betsy,corey)
  • ...RyanS covered Ops during this time & for a good chunk of the rest of the afternoon  (THANKS, dude!)
• 2046-2059 continue elevator arm work in east bay (randy)
• 2119 Checking electronics for JAC wfs at the rack (daniel)
• 2122 Working on IOT1 (new little JAC table) to look for beam (jennie.jason)
• 2140 HAM1 relay work & climbing around HAM1 (gerardo,fil)
• 2115-0020 Green arm alignment (jenne, I wrote down the steps she took & will post later...probably in the wiki)

Used the test input of the WFS patch panel to check the 45MHz transfer functions of the JAC WFS. Measurement point was at the RF monitor output of the demodulator. The attached plots show:

1. JAC WFS A segment 1 (all segments very similar)
2. JAC WFS B segment 1 (all segments very similar)
3. ASC REFL_A segment 1 (for comparison)
4. ASC POP_X segment 1 (for comparison)

Observations:

• JAC WFS B has 10x the response of all the others. 
• JAC WFS A seems to be a 36/45MHz unit, whereas WFS B seems to be a 9/45MHz unit.
• Serial # of JAC WFS A: S1300512
• Serial # of JAC WFS B: S1300504

The data sheet confirms these observations including the test input transconductance beeing 10x higher for S1300512.

(Travis S., Jordan V., Gerardo M.)

After taking an RGA, HAM7 chamber was joined to the corner vacuum envelope, we opened RV-1, FCV-1, FCV-2, FCV-3, FCV-4 and FCV-5, no issues to report.

Then we opened GV5 and GV7.  GV7 started opening at 45 psi after a double clank noise, left GV7 set at 55 psi.  GV5 took some time to open, we got up to 40 psi and then left it alone, for about 20 minutes, then increased pressure to 45 psi a loud clank and then the valve opened, GV5 was set at 55 psi.

WP13071 is closed now.

I did the monthly wind fence inspection yesterday. No new issues. Damage to the one panel at EY seems stable, no damage noted at EX. 

Thu Mar 05 10:10:28 2026 INFO: Fill completed in 10min 25secs

Closes FAMIS37262, last checked in alog88698.

Everything looks as expected, no new issues. There was an odd dust spike (10 minutes of >1000 cts, so 2 cycles of sampling) from the PSL102 (Anteroom) dust monitor on Sat Feb 7th around 11:30 local.

Fil, Erik, Dave:

Fil ran the 24V-DC power to the h1sush6 IO Chassis on the MER Wed afternoon and I completed the fiber connections to the rear of the computer in the MSR. Erik and I booted h1sush6 for the first time late Wed afternoon after setting the BIOS and IPMI.

Current hardware status:

computer has Dolphin card installed but not connected to the switch. MTP at the computer end sends 4-Adnaco and 1-timing pairs to the MER via port-3 on the patch.

This is a W2275 14core machine, was cdsproxmox2. Its disks have been removed and it needed a full set of RT BIOS changes.

IO Chassis is "what was left" of h1sush2b after cards were moved over to the new h1sush12 chassis. So it has a mismatch of cards, but each Adnaco has a unique layout which is all that is needed to confirm Adnaco functionality.

A1 [slot1=TC, slot4=18AO8]

A2 [slot1=18AO8,slot2=16AO16]

A3 []

A4 [slot1=BIO]

The computer booted with some difficulty because it was trying to load the non-existent h1iopsush6 model. We were finally able to ssh onto the machine and showcards sees all the cards except A4. 

Also the timing card is not syncing, we will investigate that today.

A minor issue, we had some DNS issues on the workstation-LAN which Erik resolved.

Randy, Mitch, Betsy, Camilla, Jenne, Jennie, Richard

ISCT1 was forklifted into place by Randy and the table height checked. The new JAC table, IOT2R, was pushed into place and lifted off it's of it's wheels, height may need to be further adjusted once we start alignment. Bellows were attached. Photos of JAC table attached.