TITLE: 06/30 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:

Busy Maintenance Day with lots of activity in/at/around BSC2 to help make Dome install tomorrow happen.  B&K, SQZ, CRS activities also continued.
LOG:

• 1441-1538 ITMy transfer functions (rahul)
• 1505-1752 lvea technical cleaning (kim)
• 1523-1647 LN2 Norco truck
• 1530-1606 Checking new ion pump at CP1  (jordan.jacob.owen)
• 1545-1637 prep IOT2 table move (randy + betsy)
• 1602-1623 guardian reboot (tj)
• 1620 Alog will be down for ~2hrs (nyath)
• 1630 Moving scissor lift from hi-bay to receiving (randy)
• 1635 property checks escorted with jason and then  (christina.jason)
• 1639 B&K BBSS @bsc2 (ibrahim,tj)
• 1642-1832 ham7 work (camilla)
• 1646 bringing ham6 hepi (ryanS)
• 1645-1816 Ground loop checks for HAM3 + BSC2 (fil)
  • 1613 PR2 + MC2 + BBSS taken from ALIGNED to SAFE
  • 1818 SUS returned to ALIGNED (oli took BBSS to Damped)
• 1649 rahul joining b&k
• 1649-1715 outbound gate broken, tyler notified. gate replaced by tyler
• 1657-1830 sqzt7 (ryanS)
• 1705-1718 running laptop to sqzt7 (sheila)
• 1708-1722 VisitTri-Cities tour (maggie)
• 1709-1900 Pacific CA system LN2 truck for where?  Heading toward X-arm (EX)
• 1710-1821 HAM1 cleanroom repairs (randy)
• 1711 seismometer testing at X-arm (shrey,carlos)
• 1720 L4C install + bag/tag @bsc2 (mitch.jim)
  • l4c swapped (needs to check it w/ spectra measurement).
• 1725 ham1 cleanroom work (sheila)
• 1730-1908 outbldgs AEDs cabinet install (chris)
• 1744-1800 check on Teams (betsy)
• 1754-1808 PCal lab meas (tony)
• 1832 ionpump work @CP1 (jordan) 
• 1832-1851 Thomas Culver (for Sen Murray) tour (mike.jenne.amber)
• 1841-1907 More ground loop checks at BSC2 feedthru for BBSS (fil.oli)
• 1858-1930 SVN server down for upgrade for devian OS (jonathan)
• 1930-2014 light swap for HAM4 cleanroom
• 1945-2000 BSC2 ISI L4C spectra--looks good (jim)
• 2000 M6.0 Gulf of California earthquake seen first on Picket Fence
• 2000 HAM3 alignment check (betsy.keita)
• 2012 looking for QOSEM (ibrahim)
• 2019-2208 viewport work at BSC2 (travis.jordan)
• 2022-2215 BBSS + itmx b&k  (tj.rahul.ibrahim)
  • 2203 rahul out
  • Ibrahim switched to OSEM sawp with Oli
• 2030-2110 centering BBSS Oplev (jason)
• 2033 seismometer testing just past the x-arm bridge (shrey.carlos)
• 2041-2315 sqzt7 visit (camilla.ryanS.maya.jackie)
  • jackie, camilla, & maya came out 
• 2042 bbss alignment (betsy)
• 2042 ham1 move (randy.betsy.others)
• 2045-2145 disha tour in CR + lvea
• 2110 EX seismic work (carlos.shrey.robert)
• 2112-2117 Nitrogen tank search (gerardo)
• 2127 help sqz get FC GV closed to calm down their beam (betsy)
• 2136-2237 swapping BBSS osems (oli.ibrahim)
  • 2234 ibrahim out
• 2142-2250 more l4c checks + float checks (mitch,jim)
  • 2246 mitch out
• 2205-2220 Dustmon at CER (ryanC)
• 2231-2238 tool search in lvea (travis)
• 2233 "brsX out of range", but this is probably shoshonna's picomotor work.
• 2253 Back to floor for another round BBSS OSEM swapping (ibrahim.oli.betsy)
• 2305-2312 CRS prep for transport (@old h2psl room) [shoshonna]
  • 2318 covering the CRS for the night (shoshonna)
• Another round of ground loop meas post OSEM swap (fil)

Rahul, Ibrahim, and I B&K'd the BBSS and ITMX today. Rahul and Ibrahim were in chamber managing the cables and covers, while I was on the laptop outside. I still need to process the results, but this alog's existence means that it happened.

Per ECR E2600223, a ZV-800 style viewport was installed on the G11 port (+X, +Y, middle port) of BSC2.  The First Contact that was applied after inspection was removed.  No smudges were noted except the outside edge, ~1/4" from the metal flange where the FC didn't cover.

A scratch was noted on the chamber conflat flange (see pic), but the actual knife edge ding associated was very small.

Betsy, Arnaud, Jeff, Oli

Physical movements made in L, T, and V match up with movement read out in EUL basis channels and OSEM basis channels.

Last wednesday (06/24/2026), after we did some checks at the QOSEM sat amp (90758), Betsy and Arnaud went into BSC2 to make some physical movements on the BS so we could check that our channels were displaying movement in the correct directions.

Three physical movements were made:

• -L direction (checking direction of L, F2, and F3)
• +T direction (checking direction of T and SD)
• -V direction (checking direction of V, LF, and RT)

L
- Pushing in -L direction
- OSEM2EUL matrix says that F2 and F3 are in same direction as L movement (+)
- Push happened at 2026/06/24 22:42:37 UTC and lasted about 30 seconds

T
- Pushing in +T direction
- OSEM2EUL matrix says SD is in the opposite direction as T movement (-)
- Push happened at 2026/06/24 22:40:31 UTC and lasted about 18 seconds

V
- Pushing in -V direction
- OSEM2EUL matrix says LF and RT are in the opposite direction as V movement (-)
- Push happened at 2026/06/24 22:34:10 UTC and lasted about 2.5 minutes
- This was done by pushing down the top vertical earthquake stop on M2

It still looks reasonable.

Before I started touching the BS, only ITMY reflection of SQZ beam was visible in AS camera and nothing in ISCT1 camera.

Betsy found that the ITMX and ITMY reflection of SQZ beam were already almost on top of each other in HAM3.

I moved BS in YAW by negative 51 counts and the differential Michelson alignment was already good, MICH fringe was visible in both of the cameras, therefore BS alignment itself is still reasonable.

On ISCT1 camera, the beam position looked different from what it used to be last Thursday (see today's video of MICH fringes PXL_20260630_202239770TS.mp4 and compare that with alog 90759). Whatever is causing this, it's not BS because BS itself cannot cause common MICH change for SQZ beam that goes to ISCT1.

I noticed that the OMC suspension was saturating but couldn't immediately see why (no ASC output or integrators left on, sliders haven't moved recently). I trended back to see when the suspension moved and found that it coincided with the Guardian machine reboot (alog90824), and trending more things I saw that the inputs to the lock filters went quickly from some thousands of counts to zero. These come from the M2 stage "ISC input filters," which also at the time of the Guardian reboot went from some thousands of counts to zero. Sheila suggested just moving the OMC back to its OSEM positions before the reboot, so that's exactly what I did. The OMC suspension is no longer saturating.

This morning Randy and I moved the IOT2L ISC table back into place on the +Y side of HAM2.  Fil can now cable it back up, although the cleanroom leg is very near all of the cable plug ins on the +X side so we may need to make a cleanroom shift.  

Then it will need bellows reattached and eventually beam checks to realign.

End X BRS has been drifting more out of rang over the past week. The BRS originally got out of range a month ago (LINK ALOG) I'm boosting the drift control (H1:ISI-GND_BRS_ETMX_HEATCTRLIN) from 4V-->8V to try and get it back to the temperature the plate was before it started to get out of range.

The original temperature is ~36, and right now H1:ISI-GND_BRS_ETMX_HEATTEMPL is reading 27.0, but I'm hesitant to max out the drift control as it was set to 6V when it was last in range.
I'll check back in on it later today/this week

Rebooted at 1601 UTC. All nodes came back without issue. New Epics addresses are in.

Ryan S, Camilla, Sheila 

We put a temporary steering mirror into HAM7, upstream of ZM4 sending the beam out to SQZT7 to try to measure the M^2 and beam astigmatism before ZM4. Location of mirror attached. Repeated with different ZM2 PSAMs values. 

• Steering mirror to BM3 = 635mm  
• Steering mirror to ZM4 = 450mm  
• Steering mirror to Beam Diverter = 235mm  

The M^2 data is attached but seemed debatable, with high with M^2 values: > 1.5 when we expect <1.2 to align with 90783. Maybe as the beam was large at the Thorlabs M^2 head, but it was smaller than specs, ~5mm diameter when max was 9mm diameter. 

TITLE: 06/30 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: MAINTENANCE
    Wind: 13mph Gusts, 7mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.12 μm/s 
QUICK SUMMARY:

Ops workstation (cdsws29) was stuck recovering from morning reboot (hit the on/off button to restore).  nuc23 & nuc22 look like they partially came back (will need to log back into them to sort their app windows.

BSC2 SEI work continues (w/ L4C swap & other final checks), FARO measurements may be complete (but FARO remains set-up outside HAM3 just in case).  SQZ work continues as well as HAM3 activities and also transfer functions for ITMy.

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

This afternoon, after IAS verified the BBSS had not moved much, Mitch and I went up above and started unlocking the ISI to rebalance. This actually went pretty smoothly. Unlocked st2 after getting a locked reference position for the CPS and loosening the balance mass lock nuts, balanced the ISI, initially using just the raw vertical cps local readout in counts, then looking at the cartesian cps in Z,Rx&RY when the balance was close. When that was done, we pulled the screws holding the st1 balance masses and unlocked st1. Small adjustment on st1, relocked both stages, locked down balance masses again and unlocked one final time to check both stages were still good. Z I left a little high to account for buoyancy, RX and RY residuals were all under 10urad. RZ residuals were higher, I think we swung about 20 urad between locked and unlocked, but I think that measurement is less repeatable between lock and unlock. We re-locked the ISI and have some clean up tomorrrow, we put our removed balance masses on top of st2 under the cover, because we didn't have bags or labels.

Tomorrow we will replace the bad L4C on st1, unlock and do final checks. HEPI seemed to ring up when I tried turning on the loops this morning, I'm hoping that is because the ISI was locked and that was changing the HEPI plant or because of work in chamber, so that needs to verfied in addition to ISI close out tfs.

Eric, Ryan S, Camilla, Sheila

All week we have been working on getting a set of OMC scans and beam profile measurements for different psams.  We have both sets of data now, with plots and scripts coming soon next week.  

OMC scans

We started with a script that Begum gave us from HAM6 work at LLO.  We set up ASC loops to go from ASA and AS B DC signals to ZM4 and ZM5 (as described in 90742).  We struggled a while to lock the OMC on the seed beam in air, hampered by 90754.  With that noisy OMC lock, yesterday Camilla manually aligned OM3 and the OMC suspension carefully to maximize the 00 transmission.  We then added offsets to H1:OMC-ASC_QPD_{A,B}_{PIT,YAW}_OFFSET, which is not the usual location for OMC QPD offsets.  We will need to get rid of these offsets before we go back to locking. 

OMC A offset: PIT 0.088 YAW: 0.133  OMCB offset: PIT 0.27 YAW: -0.22

We found that we were able to move the psams, whih misaligns the OMC terribly, run the centering loops to the ZMs, then run the OMC QPD loops to bring the 1st order peaks back down to a couple % of the 00 peak repeatedly.  We spent some time modifying and then debugging the script that Begum shared with us.  

It takes in a list of ZM4 and ZM5 strain gauge values, moves the psams servos target to that point and waits 30 seconds with the ZM centering loops on (it doesn't check the acutal value of the strain gauge, perhaps this would be a good thing to add next time).  It then turns on the OMC QPD loops for 20 seconds.  It then takes a 100 second ramp of the OMC PZT, and saves the times and ZM strain gauge targets into a yaml file.  

There is a template you can use to watch all this at userapps/sqz/h1/Templates/ndscope/OMC_psams_scans_monitor.yml  The script that runs these sweeps is at sqzutils, or /ligo/gitcommon/squeezing/sqzutils/omc_scans_sweep_psams.py  There is also a script there that loads the data, identifies the peaks and estimates mode mismatch and misalignment there, analyze_psam_omc_sweeps.py.  A preliminary plot is attached (apologies for the color choices and linear y scale here).  

M2 profile measurements

Eric and Ryan S took a series of M2 profiler measurements of the beam on SQZT 7 today, doing the alignment procedure at each strain gauage setting (they didn't adjust ZM alignments).  Their data is in here, we will post some plots of this next week.

Note about ZM5 strain guage

While Eric and Ryan were making beam profile measurements, they ran into a situation where ZM5 would not go the strain guage setting of 2.  I was able to get it to go to 2 manually, but noticed that there were times when the strain gauge voltage dropped to zero, similar to a problem seen at LLO HAM6 recently.  We should follow up on this next week.

Shoshana, Michael, Oli, Arnaud

• Verified capacitive plate are wired correctly
• Verified the HOQI wiring, and found where we had a flip between HOQI A and B (we had plugged the cables the wrong way at the db9 input of the hoqi preamp).
• Shoshana made a new MEDM screen, see attached
• Michael calibrated the angular HOQI readout in um in the HOQI1_DIST filterbank
• Tested the picomotor in chamber, using the spare channel from SPI. The screen is accessible either from the sitemap->ISC->Picomotors->TCS Y CO2->PICO 8 (or directly from the CRS_OVERVIEW screen)
  • Right Arrow = Pico arm moves Counter Clockwise (looking from the back of the Pico)
  • Left Arrow = Clockwise
  • 10000 steps at 500Hz = 1.25 turn
• Verified overnight data, but the air turbulence from the cleanroom is still too high (and motion at 15mHz too high) to have a good baseline. The hoqi noise is hovering between 10 and 100pm/sqrt(hz)>10Hz
• Created a folder under /ligo/svncommon/SeiSVN/seismic/HAM-ISI/H1/CRS to store and share CRS data, scripts and templates

CRS is ready for installation in chamber

Next:
Test that positive HOQI signal corresponds to the corner cube moving away from the sensor (same convention as OSEMs)
Calibrate the HOQI PDs to power
Install the fiber feedthrough and start cabling up in chamber