Gerardo pointed out that the HAM1 pressure had been rising for about an hour. Ryan checked that the JAC heater guardian was off. However, the JAC heater was still on at steady power. I called Jennie, and she turned the JAC heater power to zero. It had been set with a value of 0.749, which is not high compared to its usual value. We will monitor HAM1 pressure to see if it turns around.

TJ, Camilla, Tyler. WP 13451

The ITMY camera that was removed from A-1F VP3 in 90917 has now been reattached to A-1F VP2. The camera can extender needed to be reduced in thickness, Tyler did this. Camera can D970211-014, camera Balser, lens Rainbow H20X15M  and adjustable post Giotto MH1303, are originally from ITMX, swapped so height would work better. CDS camera was down so we could not yet check and adjust pointing. 

The ITMX reworked camera can is still too wide to for between the VP and Oplev Pier 91160, will now re-work the newer D1300705 type instead which will be more convenient with side access. 

FAMIS 63909

Ignoring the past couple of hours when the laser went down due to interlock work and Jason and I went into the enclosure (alog91287), things are looking pretty good. The FSS RefCav transmission is drifting down and has generally been lower than we've seen it, so at some point before IR01 we'll go in and realign the FSS path. Next week I'll compare things after the PSL is recovered in the next couple of days.

I reconnected the vacuum lines used to pull air through the dust monitors that are stationed in the PSL laser room and ante room. Back in September 2025 (alog87005) they were disconnected because the old pump had been running in reverse after a power glitch and the carbon graphite vanes blew air through the lines as well as little bits of the vanes. Since then we have replaced all of these pumps with ones that cannot contaminate the areas they are trying to sample. The corner station is running on a scroll pump with a automated back flow valve and the end stations are on diaphragm pumps. 

Dust counts in the PSL laser room and ante room should now be considered real.

TITLE: 07/28 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: Ryan C
SHIFT SUMMARY:

Today was the first main day for the RCG Upgrade (so lots of systems are down for this work).  The RCG work will definitely continue tomorrow!

LOG:

• 1415 Scissor lift move (randy)
• 1437 SEI_ENV to MAINTENANCE
• 1438-1532 technical cleaning in lvea (kim.dawn)
  • 1714-1801 back in lvea (kim)
  • 1803-1851 Going to EX (kim)
• 1854-1504 SEI & SUS:  SEI taken to ISI DAMPED HEPI OFFLINE
• 1518 SDF checks (tony, tj)
• 1521 LASER STOP BUTTON--> I got to hit the big red button in the Control Room for Fil to start Access System work! (watched the PSL cameras next to the button & confirmed beams disappeared!).  In hindsight, I guess I should have waited a little because Tony & TJ were looking at SDFs and mentioned it would have been nice to wait a few minutes for them!  lol
  • Now that Lasers on ACCESS System are OFF, we are Upgrade Phase 
• 1525-1655 Cleanroom move out of Biergarten (randy.eric.chris.tyler.jordan)
• 1553-1940 MX+EX Turbo pump maintenance tests (travis)
  • 1931 moved to EX
• 1607-1840 EX+EY trip for RCG (dave.tony)
• 1610-1723 Seismometer testing at bridge berm (carlos.shrey)
• 1615-1710 LVEA walkabout (richard)
• 1618-1621 Closing PSL+ALS light pipes (oli)
• 1626-1804 ZM5 continued (rahul, ryanC)
• 1626-1802 Norco LN2 delivery to CP2 @LVEAx
• 1636-1711 Moving a new hefty wire rack from receiving to HAM6 (jim)
• 1653-1711 HAM3 peak thru a viewport (shoshonna.jim)
• 1700-1748 EY Annulus Ion Pump check (jordan)
• 1705-1852 cleanroom fans @westbay (randy)
  • 1940-2139 continued in afternoon (randy)
• 1705-1754 CRS Safety interlock set-up near TCS racks (fil)
• 1720 Interlock software (patrick)
• 1726-1910 Pacific CA Systems delivery of LN2 to EX
• 1728-1804 spi shutter cable & test dustmonitor (jason.ryanS)
• 1731-1857 connecting PSL dust monitor (+ IR x-arm spool camera) [tj]
• 1732-1804 fire pump maintenance checks (eric)
• 1739-1857 IR X-arm spool camera (camilla)
• 1800-1833 Checking EX.EY HEPI pump stations(jim)
• 1811-1815 Moving a cart from OSB Cleaning Area to Staging (ibrahim)
• 1845-1910 JAC table & PSL racks (jennie)
• 1930-2130 EY trip for RCG (dave.tony)
• 1936-2249 CER+Mech Rm Mezzanine to document S/Ns for LIGO Timing & DAQ cards (fil)
• 1944 staging for HAM2 AIP (gerardo)
• 2015 Seismometer testing at bridge berm (carlos.shrey.robert)
• 2025-2103 FAMIS checks at MY/EY/MX (chris)
• 2031-2102 SQZ rack measurements for PSAMs (rahul, ryanC)
• 2042-2058 GV6 parts staging (jordan)
• 2047-2053 swapping in another cps probe for BSC2 SEI ISI (jim)
• 2055-2120 JAC table pics (jennie)
• 2122 Grabbing beam profiler from HAM7 (camilla.maddi)
• 2123-2142 PNNL tour (cassidy)
• 2139 GV6 staging & scaffolding tests (gerardo)
  • 2207 joined by jordan & travis
• 2140-2207 EY AIP pumpdown check (jordan)
• 2138-2253 EY table checks  (camilla.maddi)
• 2206 Beckhoff reboot for channel name change (daniel.ryanS)
• 2312 Labeling CRS+SPI optical Fibers with laser hazard stickers for HAM1/2/3(fil)
• 2314 Small group tour (ibrahim)

Ryan C, Rahul

The broken PSAMS unit has been replaced (again for the 2nd time in the last two weeks) with a repaired one (ZM5-SN4, repaired by CIT and characterized by Camille). Once the PSAMS optic was installed in ZM5 suspension, we suspended all stages and balanced it and laced the mighty mouse cable. ZM5 was then re-installed in HAM7 chamber and dogged down by two dog clamps for now.

Inside the chamber, the PSAMS and BOSEM cables are now connected to the electronics chain and all stages of the suspension are set free. 

I will take health check measurements once the front end comes back online.

In the meanwhile we tested the PSAMS near the SQZ racks and the results are given below,

SG (Strain Gauge) resistance was measured to be 355.7 ohms (pin 11&24) and 707 ohms (pin 12&24).

We were able to drive the PZT voltage from 0 to 200V and obtain the strain gauge voltage ranging from 0.365V to 5.41V.

Attaching latest pictures of ZM5 below after it has been re-installed in the chamber.

FAMIS tasks 65526 and 81155, WP 13458

Procedure checklist for both stations completed.  No issues were identified at this time.

MX: Turbo pump hours: 154
       Scroll pump hours: 243.0
       Crash bearings: 100%

EX: Scroll pump hours: 7163.2
       Turbo pump hours: 1115
       Crash bearings: 100%

J. Oberling, R. Short, T. Shaffer

This morning we swapped the temporary SPI shutter cable, for the shutter in the SPI pickoff path on the PSL table, with the permanent one.  Once the old cable was removed we fed it out of the PSL enclosure wall penetration to TJ, who then fed the permanent cable into the PSL enclosure for us (thank you, TJ!).  The cable was secured in the same was as the temporary cable was, see attached pictures.  We tried to physically move the cable into the ALS beam path and were unable to do so; at rest the cable is ~2.5" from the ALS path and the closest we could get it was ~2", so the cable is well secured and unable to drift into the ALS path.  This cable had been successfully tested with a spare shutter before installation, but due to the ongoing CDS upgrade we were unable to test it with the installed shutter; this will be done once everything is back up and running.  This completes LHO WP 13464.

TITLE: 07/28 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: CALM
    Wind: 4mph Gusts, 2mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.13 μm/s 
QUICK SUMMARY:

Big item today/next few days is the RCG Upgrade, followed by access system work (taking down lasers), and this morning is cleanroom moving around Biergarten.

Last night, Betsy transitioned the LVEA to Laser Safe (Operations Phase...lasers can be on, VAC/Tables CLOSED).  This Morning for the Access System work, we will be full on Laser Safe (Upgrade Phase...lasers OFF, VAC/Tables CLOSED)

IMC OFFLINE / JAC is DOWN.  Just took SEI_ENV to MAINTENANCE.  Will need to take SUS & SEI to desired states for the RCG work when we get the word.

Pending Filter Files:

h1calcs had a modified filter file waiting to the loaded. The running filter file was last loaded 16jul2026, H1CALCS.txt was modified at 10:52 27jul2026 and not loaded. I made a local copy of the modified file, then removed the changes by doing a subversion revert. This cleared the CFC flag on h1calcs.

SDF Diffs:

Several models have outstanding SDF diffs (screen shots attached below)

Elenna, Oli

We spent some time figuring out SDFs for the BBSS. It should be all good to go.

A couple of notable channels that will need to be figured out at some point are:

• H1:SUS-BS_M2_DRIVEALIGN_Y2L_GAIN: For the BSFM this gain was set to 11. Since we had inputs coming in for this filter we decided to commit it as a gain of 0 until we verify the gain that needs to be there
• H1:SUS-BS_M2_OLDAMP_{P,Y}_GAIN: For the BSFM the P gain had been set to 300 and the  gain had been set to 650. We seemed to be doing okay with that value, but something must've changed while we were consolidating SDFs that made it so we started saturating the M2 DAC. So we turned both these gains to 0 and will need to figure them out.

I've attached a pdf with the full list of sdf diffs that we accepted. The notable channels listed above are highlighted as * and **

Ryan C, Rahul

In preparation for our second replacement of the PSAMS, we have taken SUS ZM5 out of HAM7 chamber and staged it on the table next to it. We took the bottom stage PSAMS out of the suspension cage - this unit has wires shorting inside the mirror housing.

Tomorrow morning we will start replacing it with the unit CIT has shipped us - which was originally installed in ZM5 (LHO) but broke down two weeks ago (Strain Gauge wire leads got loose inside), then got fixed at CIT and re-shipped to us with 65 in-lb torque.

Camilla, Rahul

SUS ZM2 in HAM7 chamber needed a pitch offload since it was using up a lot of DAC output. This morning we went to HAM7 chamber and at first confirmed the beam alignment and its position on the irises. Then I entered in HAM7 chamber and locked the suspension and unlocked the pitch adjuster screw. At first I gave it a full 1 turn anti-clockwise making ZM2 pitch down (and then unlocked the suspension) and Camilla confirmed that the alignment looked better but perhaps we overshot by a small amount. I retracted by 1/4 turn (thus making 3/4 turn anti-clockwise in total) and then the beam looked good on the iris. Before exiting the chamber I locked the screw for pitch adjuster and checked if all EQ stops were set free from the suspension chain.

Finally Camilla adjusted the alignment sliders on ZM2 for fine tuning it. 

I took a quick chamber side transfer function measurements and the suspension was found to be healthy.

Ryan S, Camilla

• Nominal alignment, 1.33mW out of OPO, Lost between 0.07mW and 0.09mW though after BM4, No obvious loss place in OPO
  • Between 5.2% and 6.7% lost
• "New ZM2" alignments, 1.33mW out of OPO, Lost between 0.06mW and 0.1mW though after BM4, No obvious loss place in OPO
  • Between 4.5% and 7.5% lost

Rahul, Sheila

We measured distances in HAM7 on the VIP.  For optic names see D2000021 (A:L2 and A:L3 are actually one lens, we will call it A:L2)

• A:M3 to A:DC2: = 61mm
• D:DC2 to A:L2 = 35+-2mm
• A:DC2 to SFI1 wedge= 215mm
• A:L2 to SFI1 wedge: 
• SFI1 wedge to A:P1 = 257mm
• SFI1 wedge to B:M1= 389mm 
• B:M1 to B:M2= 221mm
• BM1 to B:L1= 87+-3 mm
• B:L1 to B:M2: skip
• B:M2 to B:P1 = 57mm (+-1mm)
• B:P1 to SFI2 wedge: 277+-2mm
• SF2 wedge to B:M3: 57mm
• B:M3 to B:L2= 96 +-2mm
• B:M3 to B:BS1 = 207mm
• B:BS1 to B:M4:97+-2mm
• A:P1 to A:L1: 66+-2mm
• A:P1 to A:M2= 87mm
• A:M2 to A:M1: 41mm
• A:M1 to A:DC1 = 67mm
• A:DC1 to edge of OPO box:63mm