Took transfer functions for the suspensions in HAM1 since they're now in a state where they're not being affected by air anymore. They're all looking good. RM1 and RM2 are flipped in phase, but they've been like that (84543).

Settings:
- ISI DAMPED
- DAMP OFF
- OPTICALIGN OFFSETS OFF

JM1
Data:
/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/JM1/SAGM1/Data/2026-03-03_1730_H1SUSJM1_M1_WhiteNoise_{L,P,Y}_0p02to50Hz.xml
Results:
/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/JM1/Results/2026-03-03_1730_H1SUSJM1_M1_ALL_TFs.pdf
r12929

JM3
Data:
/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/JM3/SAGM1/Data/2026-03-03_1800_H1SUSJM3_M1_WhiteNoise_{L,P,Y}_0p02to50Hz.xml
Results:
/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/JM3/Results/2026-03-03_1800_H1SUSJM3_M1_ALL_TFs.pdf
r12930

PM1
Data:
/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/PM1/SAGM1/Data/2026-03-03_1840_H1SUSPM1_M1_WhiteNoise_{L,P,Y}_0p02to50Hz.xml
Results:
/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/PM1/Results/2026-03-03_1840_H1SUSPM1_M1_ALL_TFs.pdf
r12931

RM1
Data:
/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/RM1/SAGM1/Data/2026-03-03_1855_H1SUSRM1_M1_WhiteNoise_{L,P,Y}_0p02to50Hz.xml
Results:
/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/RM1/Results/2026-03-03_1855_H1SUSRM1_M1_ALL_TFs.pdf
r12933

RM2
Data:
/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/RM2/SAGM1/Data/2026-03-03_1910_H1SUSRM2_M1_WhiteNoise_{L,P,Y}_0p02to50Hz.xml
Results:
/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/RM2/Results/2026-03-03_1910_H1SUSRM2_M1_ALL_TFs.pdf
r12935

Comparison
Results:
/ligo/svncommon/SusSVN/sus/trunk/HTTS/Common/Data/allhttss_2026-03-03_HAM1_BackinVac_ALL_TFs.pdf
r12936

This week, in the optics lab flow bench, I started doing the assembly of the ISIJ SPI reflector assembly. There were a few stumbles, the biggest being a custom peek retaining ring that looks very similar to an incompatible catalog part that got mixed in with the JAC stuff. Once that was found, the reflector assembly more or less went together as described in Sheon's procedure, T2500318. I think the only thing missing is an accuglass cable clamp, but we can add this later or come up with a zip tie to capture the cable.

First photo is the is the reflector assembly itself. This is where I finished yesterday. Second, third and fourth images are the reflector assembly with the shroud attached. Jeff said we may not use this, but it will provide some protection for the time being. 

Fifth, sixth and seventh images are the information I have for the lens, beamsplitter and QPD.

Tue Mar 03 10:08:36 2026 INFO: Fill completed in 8min 33secs

Laser Status:
    NPRO output power is 1.84W
    AMP1 output power is 70.39W
    AMP2 output power is 138.9W
    NPRO watchdog is GREEN
    AMP1 watchdog is GREEN
    AMP2 watchdog is GREEN
    PDWD watchdog is GREEN

PMC:
    It has been locked 0 days, 0 hr 0 minutes
    Reflected power = -0.4136W
    Transmitted power = -0.02846W
    PowerSum = -0.4424W

FSS:
    It has been locked for 0 days 0 hr and 0 min
    TPD[V] = 0.003508V

ISS:
    The diffracted power is around 4.1%
    Last saturation event was 0 days 0 hours and 36 minutes ago

Possible Issues:
    FSS TPD is low (dropped at ~1710 UTC today)

WP13054 h1guardian1 reboot

Ryan S, Dave:

At 07:59 PST we rebooted h1guardian1. This was a maintenance reboot, it had been running for 74 days (since 19dec2025). No changes to the OS were made. 

18 nodes had been pending loading the modified ISC_library.py common file. Ryan had checked that none of these nodes were using the modified section of this file.

There were no problems with the reboot and restart of the 176 guardian nodes.

ALIGN_IFO       NOT LOADED  ISC_library.py  13:08 Tue 24feb2026    13:12 Fri 19dec2025
ALS_COMM        NOT LOADED  ISC_library.py  13:08 Tue 24feb2026    13:11 Fri 19dec2025
ALS_DIFF        NOT LOADED  ISC_library.py  13:08 Tue 24feb2026    13:11 Fri 19dec2025
ALS_XARM        NOT LOADED  ISC_library.py  13:08 Tue 24feb2026    13:12 Fri 19dec2025
ALS_YARM        NOT LOADED  ISC_library.py  13:08 Tue 24feb2026    13:11 Fri 19dec2025
CAMERA_SERVO    NOT LOADED  ISC_library.py  13:08 Tue 24feb2026    13:11 Fri 19dec2025
H1_MANAGER      NOT LOADED  ISC_library.py  13:08 Tue 24feb2026    13:34 Fri 19dec2025
INIT_ALIGN      NOT LOADED  ISC_library.py  13:08 Tue 24feb2026    13:11 Fri 19dec2025
ISC_DRMI        NOT LOADED  ISC_library.py  13:08 Tue 24feb2026    13:12 Fri 19dec2025
ISC_LOCK        NOT LOADED  ISC_library.py  13:08 Tue 24feb2026    13:12 Fri 19dec2025
LASER_PWR       NOT LOADED  ISC_library.py  13:08 Tue 24feb2026    13:11 Fri 19dec2025
OMC_LOCK        NOT LOADED  ISC_library.py  13:08 Tue 24feb2026    13:12 Fri 19dec2025
SEI_CONF        NOT LOADED  ISC_library.py  13:08 Tue 24feb2026    13:11 Fri 19dec2025
SEI_ENV         NOT LOADED  ISC_library.py  13:08 Tue 24feb2026    13:12 Fri 19dec2025
SQZ_FC          NOT LOADED  ISC_library.py  13:08 Tue 24feb2026    13:11 Fri 19dec2025
SQZ_MANAGER     NOT LOADED  ISC_library.py  13:08 Tue 24feb2026    09:21 Tue 23dec2025
TMS_SERVO       NOT LOADED  ISC_library.py  13:08 Tue 24feb2026    13:11 Fri 19dec2025
VIOLIN_DAMPING  NOT LOADED  ISC_library.py  13:08 Tue 24feb2026    13:11 Fri 19dec2025
 

TITLE: 03/03 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: MAINTENANCE
    Wind: 7mph Gusts, 4mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.15 μm/s 
QUICK SUMMARY: HAM1 pumpdown had to be stopped last night and will be restarted this morning. Cable pulling, cleanroom moves, and a reboot of the Guardian machine are also planned for today.

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

(Travis S., Gerardo M.)
Pumpdown was started this morning, sorry no blowdown data.  By the time I remembered to take the reading there was no more pressure inside the chamber.  Travis connected all of the equipment while I wrestled with the viewport inspection.
Pumpdown was started without an issue.  We started with the scroll pump from the super sucker 500, the scroll pump of the SS500 cart brought the pressure down to 3.7x10-01 Torr, then we switched the cart to start pumping with the turbo pump/scroll pump.  We had one trip of the system, usually due to a time out, but it only took a restart of the turbo pump and the pumpdown to continue.
Unfortunately the pumpdown had to be stopped at 8:00 PM local time, with a pressure of 4.0x10^-05 Torr, at that pressure the set points had not activated on the SS500 cart controller, the set points are hard set and can't be modified from the SS500 controller screen.
Pumpdown will be restarted tomorrow morning.

Note, on the attachment, regarding the screens, no set points for channel 1.

We migrated the last system to the new VM cluster and powered down cdsproxmox0, cdsproxmox1, cdsproxmox2, cdsfs0 cdsfs1.

Cdsfs0, cdsfs1 have been moved into the DTS to become part of a cluster there along with the old commvault machine.

cdsproxmox2 was a spare w2275 and Dave will be using that to support some of the upcoming work.

I'll close the work permit tomorrow after we pull cdsproxmox0 & 1 from the racks.

TITLE: 03/03 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: HAM1's main volume is pumping down nicely as of this morning. Cable pulling and parts cleanup also took place out in the LVEA.
LOG:

FAMIS 31127

Jason made a brief trip into the enclosure 4 days ago, which is seen in the usual places. Also, the differential pressure between the laser room and anteroom changed around that time. Nothing much else to report this week.

TITLE: 03/02 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: MAINTENANCE
    Wind: 3mph Gusts, 0mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.14 μm/s 
QUICK SUMMARY: The HAM1 annulus has been pumping over the weekend, and if that's reached a low enough pressure, then pumping can start on the HAM1 main volume today. A few decent-sized earthquakes rolled through overnight as well.

Richard, Marc, Jonathan, Erik, Dave:

On Monday 23rd the CHETA slow controls chassis was installed in the Vacuum Prep Lab (VPL). We connected its ECAT ethernet port to the MSR Beckhoff chassis AUX-1 port partially by copper (VPL to Rm163 into CUR) and partially by fibre (CUR CDS edge switch to MSR edge switch).

This appeared to work, but later we found out that the CDS core switch was complaining constantly of rapid movement of a MAC address on the ports used by CHETA. Further reading suggests ECAT does not strictly support unique MAC addresses per Beckhoff terminal, and it appears they may all have the same non-standard MAC address.

In addition, since Monday we have been seeing regular dropouts of the CUR network switch stacks, every 6 hours at 00:41, 06:41, 12:41 and 18:41 for about a minute apiece.

This afternoon we ran a long 148' cat5e ethernet cable from room 163 to the far end of the MSR. At 16:01 we routed the CHETA chassis connection to use this cable, we now have contiguous copper run between the two chassis.

This will fix the MAC movement issues on the CDS core, and time will tell if if fixes the CUR switch dropout.

We installed JM1, balanced it and aligned it. A beam dump was placed behind it though we could not see the transmission with 1W input.

After this, JAC locked with RF without any problem though the input was wobbly when the purge was up.

We searched for unexpected ghost beams (also with 1W input) and didn't find any.

We uninstalled many (but not all) temporary dog clamps and irises.

We revisited the IMC alignment because it's been off in PIT since Thursday or Friday. We locked JAC using dither (because we wanted to turn down the purge air). We enabled the IMC WFS just for MC optics and steered JM3, but weren't able to center the MC2 trans. Steering JM3 just made the IMC transmission worse while making not much impact on the desired degree of freedon (JM3 PIT -> MC2 trans YAW, JAM3 YAW -> MC2 trans PIT).

Tomorrow, we'll revisit the IMC alignment. We'll also measure the power coming into JAC TRANS PD as well as the actual transmission of JAC while locking it with RF so we can use JAC trans PD as the measure of the power into HAM1.

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

Late entry-

Late Wednesday we vented the annulus system for HAM4 using nitrogen.  On Thursday, we removed and replaced the ion pump, a very uncomfortable location for this pump, it is surrounded by cable trays, see photos.

We have not been able to fasten the mounting bolts that hold the ion pump body in place, we have noticed that the pipes for the annulus system leading up to the mounting flange are not parallel to the ion pump flange they are |/ and they should be ||.  So, we have to twist the pipe to be able get it parallel to the pump.  We have a mechanical block supporting the pump as a temporary support, we'll replace it as soon as possible.

Jennie W, Jason O, Keita K, Betsy W, Camilla C

Summary: EOM alignment and position captured, moved to opics lab for crystal replacment, JAC-REFL path alignment in progress.

This morning Jason, Keita and I checked the centering of the HAM1 irises after the JM3 alignment Olli and I did on Tuesday. We didn't move the irises right after JM3 as this seemed centred. We did reposition the iris right before the HAM2 septum plate in x and y.

This, along with the alignment of the IMC Olli, Jenne and I did on Tuesday, captures where the beam was with the current EOM installed.

Keita marked the EOM base position with a dog clamp and removed it to the optics lab for crystal replacement. The shims for the EOM and the screws that hold it to the table are in a foil packet on the +Y - X HEPI pier.

Betsy, Camilla and I rechecked the REFL path and spent some time moving JACR-M2 to centre it on the incoming and outgoing beams. Then we pitched down this mirror so the outgoing beam hit the upper periscope mirror. After this Betsy had some concerns that we were too close to where the JM3 tip-tilt will sit (we are  currently using a siskiyou mount for this mirror). So we yawed the JACR-M2 mirror so the beam hits the viewport slighly more to the right (as viewed from -Y side). Looking at the placement on the viewport simulator, the beam is low and right on the viewport, whereas it comes to the table, high and right in the bellows hole. This table it almost at the top of its adjustment range, so Jason and I plan to go in this afternoon and see it we can move up the table feet so the beam can move up in the viewport a bit. Betsy and I measured the tilt of the beaM from JACR_M2 off the table. The heigh is 103 mm at the table hole 8 inches from the -X edge and 8 inches from the +Y edge. It tilts up to 113mm at the last hole in this row on the -Y side.

Betsy and I also checked the pitch of the beam entering and leaving JAC after the EOM was removed. The input beam to the JAC was 102 mm above the table, the output beam before the L1 lens was the same height, and the beam height just before JAC_M3 was also 102mm. There is not a large distance between the JAC and JAC_M3 steering mirror so it is hard to get a good measurement of any small pitch in the beam. Pictures for this alog are coming.

Jennie W, Jason O, Tony S, Olli P

Yesterday we put the viewport simulator on the -Y door of HAM1 to enable us to check the JAC REFL path, we had to move the in-vac mirrors for this path a couple weeks ago because the beam hit the side of a beam dump before hitting the second steering mirror after the JAC input coupler and so was mis-aligned.

The viewport simulator has tape marking the centre of the real viewport for this beam that was put in last time we had it up on this door.

We also rolled up the IOT1 table and plugged it in.

We had to move the table in -x direction from its ground markings as the periscope was too far right in the relative to the bellows hole and the viewport simulator, we also moved JACR-M1 as it was one row of holes too far in plus x direction.

The beam hit too high on the periscope, so it was missing the mirror by an inch, this will need to be corrected with pitch on the in-vac steering mirrors.

Randy, Ibrahim

Randy and I put the BBSS in the can today, as shown by pictures.

Following LLO's advice from their experiences in alog 79950, we were able to use the aluma lift to can the BBSS. What we did in order:

1. Strip locked-mass BBSS of all cables, check for looseness, bring alum-a-lift into position to lift BBSS from lifitng bars

2. Undo dog clamps to let lift take suspension load, ensure suspension is secured on the lift. Move BBSS out of test stand - as LLO said, very small clearance.

3. Prepare temporary platform for lift fork adjustment

4. Set BBSS on temporary platform - this part was successful but needed extra blocks to avoid interference with Y-bracks on the Lower Structure.

5. Adjust forks to be allow for canning without bottoming out, relift.

6. Put into wiped-down can and check for looseness. Rewipe, check for particulate and ensure secure fit

7. Close doors.

See pictures below.