The CDS_CA_COPY Guardian had not been running for roughly the past month due to three disconnected channels reported by SPM (H1:VID-FC_TRANS_A_{X,Y,SUM}). These channels went dead on January 27th when the new VM cluster was installed (alog88919) because they had been running on a dummy IOC called "cam_fc_trans_a_dummy_ioc" (created in March 2024, see alog76146) that must not have been brought over to the new VM cluster. Dave and I decided that since these channels have all been reporting zeroes for almost three years, possibly because that camera is not working, we would simply comment out these channels from the cds_ca_copy_list.txt file so they aren't referenced. After doing that and restarting the Guardian code, the node is working properly again.

Jennie W

I updated the medm for the IMC WFS to remove the feedback references to the PSL PZT. This feedback path had been removed from the model this morning (thanks Dave for the rev-locked build of h1ascimc and the DAQ restart). The WFS screen output matrices have been updated to put back the fifth DOF and removed the path to the PZT. We never control this fifth degree of freedom but it is still in the simulin model so we should leave it in. The second picture shows the output matrix screens which no longer contain the PZT feedback column.

Fri Feb 27 10:09:01 2026 INFO: Fill completed in 8min 58secs

Closes FAMIS#39856, last checked 89201

Corner Station Fans (attachment1)
- All fans are looking normal and within range.

Outbuilding Fans (attachment2)
- All fans are looking normal and are within range.

Jennie, Keita, Ryan S, EJ, Dave:

Jennie and Keita did a clean up of the h1ascimc model which was installed this morning. A DAQ restart was required, 14 slow channels had been removed.

As we had seen previously, restarting h1ascimc still causes DAC errors on h1iopasc0, and the safest way to restart h1ascimc is part of a full model restart on h1asc0.

Ryan confirmed a good SDF status and all the models were restarted (h1iopasc0, h1asc, h1ascimc, h1ascsqzifo).

The DAQ was then restarted, no issues other than GDS1 needing a second restart.

Closes FAMIS#38814, last checked 88932

BRS Driftmon
Auxiliary BRS Channels

Everything looking normal

TITLE: 02/27 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: 4mph Gusts, 2mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.23 μm/s 
QUICK SUMMARY: One door and a viewport remain to be installed on HAM1.

Jennie W, Keita K,

While the laser was off and the chamber closed we measured the response function between the JAC PZT driver and the JAC TRANS A PD. We expect some coupling as the two cables are routed together along the table and to the feedthrough.

See the attached plot. The red measurement was at a whitening gain of 10 dB in Beckhoff with the -10dB filter engaged on the JAC TRANS A LF filter bank. The blue measurement is with the whitening gain at its nominal of 30dB, with the -30dB filter engaged in the filter bank instead.

We don't know yet if this level of coupling will affect us until we start locking again at our nominal input power.

Jennie W, Keita K,

Since the doors went on today, Keita and I checked our JAC + IMC model sdfs in prep for model updates to the h1ascimc model tomorrow.

I include a photo of what we accepted/reverted.

Some of these may get changed again during commissioning once we turn up the power.

Still need a similar check of SAFE sdfs for JAC locking but this is less urgent as we don't need any model changes in the near future and are still working on optimising the JAC-REFL locking.

TITLE: 02/27 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: HAM1 -Y door is on! Viewport and +Y door will have to wait

HAM1 - SUS TFs DONE (JM1, PM1)
HAM1 - Septum covers off, final table checks DONE
HAM1 - Install -Y Door DONE
HAM1 - Install -Y Door Viewport NOT DONE
HAM1 beam check thru viewport DONE
HAM1 - Layout pix DONE

LOG:                                                                                                                                                                 

Jordan, Randy, Eric, Tyler

Once we got the go ahead from Betsy, we installed the -Y door on HAM1 (particle counts were 0/0/0 in the cleanroom). Initially no issues, but as we brought the door close to the flange, the inner o-ring jumped out of the groove. We had to move the door back from the flange and re-seat the o-ring. 

With the door tacked with ~8 bolts, we removed the blank on the A2F3 port so they could check beam alignment on the viewport to be installed.

2nd time was the charm, the o-ring stayed in place so we installed and tightened all bolts. The gap closed up evenly. +Y door still to be installed.

Jordan and Camilla pulled the FirstContact from the JAC viewport in prep to install it on the -Y door.  Unfortunately the inner glass surface was still showing many dots of particulate so we decided to re-FirstContact clean it.  I poured on a new sheet and we are now letting it dry overnight.  Install will need to happen tomorrow after we pull the sheet and hopefully have better results.  This seems to be typical of FirstContact these days - needing to reapply a second time on numerous optics...

PM1 is looking good. We've been having more struggles with this suspension the past few days but figured everything out.

The issue was that the OSEMs suddenly started moving much more and were saturating the ADC. We started seeing PM1 constantly saturating when it wasn't being damped starting this week, when the other undamped suspensions in chamber were not saturating. It seems like this started on Sunday Feb 22, 2026, 21:48 UTC (13:48 Pacific). This is when the purge air line was fixed and let back into HAM1, and when a second cover was installed on the +Y chamber door (89225). The other suspensions aren't moving anywhere near as much as PM1, but PM1 is also on the edge of the table so that might have contributed. I took spectra of PM1 and RM1 for two timespans: last week when the purge air was 'normal' and no one was in chamber, and this week when the purge air was at the new 'normal' and no one was in chamber (ndscope). You can really see the difference in how much more the OSEMs are moving for both suspensions these last few days, and comparing the two suspensions you can also see that PM1 is always noisier than RM1 (PM1, RM1). Luckily as long as we are damping PM1 it is looking good.

After we figured that out and replaced an OSEM (89285), I took some closeout transfer functions for PM1. They're looking good and comparing them to May 2025 and to a few days ago before the OSEM swap, they match up well

Settings:
- ISI DAMPED
- DAMP OFF
Data:
/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/PM1/SAGM1/Data/2026-02-26_1730_H1SUSPM1_M1_WhiteNoise_{L,P,Y}_0p02to50Hz.xml
Results:
/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/PM1/SAGM1/Results/2026-02-26_1730_H1SUSPM1_M1_ALL_TFs.pdf
r12925
Comparison:
/ligo/svncommon/SusSVN/sus/trunk/HTTS/Common/Data/allhttss_2026-02-26_PM1_May2025vsFeb2026_ALL_TFs.pdf
r12928

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

Wednesday afternoon we had the opportunity to remove and replace the annulus ion pump body for BSC8 annulus system.  To reach the ion pump body we used the scissor lift that Randy moved near the chamber.
No issues were encountered on the removal or installation of the ion pump body.  The annulus ion pump system was evacuated and we left it pumping down with an aux cart and a small "can" turbo.  On this system we used a noble diode pump, which required us to replace the controller for a positive one.  Setpoints were set on the aux cart and at the end of the day the annulus system had reached below 5.0x10^-05 Torr.

Picket Fence earthquake early warning system can't connect to station "UO_TOOM:HHZ", so we're only monitoring on four out of five stations.

Now that HAM7 is at sufficient pressure (6.4E-7 Torr as of this post) we helium leak checked the two re-installed 12" CF blanks removed for table locking and the entire relay tube assembly which had been removed for the viewport adapter on HAM5.

The Helium background was unstable, so we turned on the HAM7 cleanroom (on 2/18 afternoon) to help flush the area of helium overnight.

Today the background stabilized around 1.5E-10 Torr-l/s, so we were able to continue leak checking. No significant helium signal observed above the leak detector background which hovered between 1.5&2E-10 Torr-l/s during leak checking. 

HAM7 continues to pump down with the turbopump, next steps are chamber RGA scans.