It was a long day, but the HAM1 ISI is in the chamber. Mitch pointed out first thing this morning that the install fixture was still in the "short" configuration, with 2" spacer pads on the under side of the middle stand. We partially disconnected the I beams an swapped to the "tall" configuration, squared the I beams up to the chamber, including checking the height of the feet (procedure says 3", but could vary), centering on the HEPI piers with a plumb bob, checking I beam level with a bubble level and checking the vertical gap between the tightest point between the I beams and the chamber door, which the procedure recommended be 1.5". We then brought the ISI container into the LVEA, then realized the pallet jack was too close to the container to open the latches for the lid. We put the container on cribbing, adjusted the pallet jack then took lunch. After lunch, we took the lid off the can, flew the ISI over to the install cart by HAM1 and made a first attempt to slide the ISI in, at which point we realized the Stage 0 of the ISI would hit the tips of the HEPI springs. After much deliberation, we set the ISI back down on the cart and used the crane to lift the install fixture (I beams and stands) and extended the padded feet as muc has possible. We had to use the fork lift on the -Y side of the chamber, as the clean room blocked crane access. Clearance between the outside edge of the I beam and door was now about .5" and the feet were 4" above the floor. At this point the ISI sailed over the HEPI springs and we were able to proceed with the ISI install as normal, smooth sailing. 

First two photos show the height of the feet and the clearance between the I beams and the chamber. Last one shows the clearance through receiving with the container, as we brought the ISI in. Others got pictures of other points and I hope will add. 

We still have to pull the install fixture, then we can start plugging stuff in.

J. Kissel, S. Koehlenbeck, J. Oberling, R. Short, J. Freed
ECR E2400083
IIET 30642
WP 12453

After this morning's kerfuffle / belated power-outage recovery with the PSL HVAC system was resolved, Sina, Ryan, and Josh began the procedure we're walking thru outlined in Section 1 of T2500024. We're keeping running notes on the fly at the bottom of the google-doc for now.

In summary here, with more details to come, we got as far as 
- Clearing out some old IO equipment that unused and in the way of the SPI pick-off path
- Measuring the power around ALS-PBS01
- Installing the new ALS/SPI 80R/20T beam splitter
- Measuring the beam profile along the future SPI path, in reflection of this 80R/20T beam splitter.

Today's activities:

• GV7 was soft closed to facilitate leak checking of the X beam manifold.
• The X manifold Turbo station was spun up and valved into the volume.
• BSC8 annulus is still pumping.  We attempted to swap it to ion pump only pumping, but it didn't hold long, so we valved the aux cart back in and will let it pump overnight before trying IP only again.
• CP1 RGA bakeout has commenced.
• HAM1 replacement gauge has arrived, but was poorly packaged, so it will be tested in the EE lab prior to install.

There is an oplev chassis in SUS-R1 that isn't used for anything anymore. I powered it off and it will be removed soon.

TITLE: 04/15 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 18mph Gusts, 10mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.24 μm/s
QUICK SUMMARY:

Verbals Ops Remider to sweep the LVEA before relocking. Something tells me we are gonna have a long Tuesday maintenance today and may not get around to the LVEA sweep today. :)

Updates on the Upgrades the Following:
Install an ISI in HAM 1.
SPI in PSL - add ALS pickoff mirror - Update, The PSL team had some HVAC issues  stemming from the poweroutage and were delayed.
VAC - HAM1 Top flange Gauge work table side - GM -- Travis has his hands on the new one and wants to install it..... but there is a flying ISI currently in the LVEA.
 

Norco arrived at exactly 15:00 UTC and drove to the CP2 N2 tank on the +X side of the corner station.

16:00 UTC Test T569591

Second Norco truck arrived 1700 UTC heading Down Y-ARM to Mid Y CP3

18:17 UTC PSL team makes it into the PSL room, after an hour

1 ton taken to dump to offload.

18:45 UTC 2nd Norco truck leaves.

Edgard, Oli

As a continuation from yesterday's work on getting the new noise estimators up and running for PR3 and SR3, we've copied over the filters used in the normal M1 damping for PR3 and SR3, H1:SUS-{PR3,SR3}_M1_DAMP_{P,Y}, for Pitch and Yaw over to new filter banks: H1:SUS-{PR3,SR3}_M1_{PIT,YAW}_DAMP_OSEM and H1:SUS-{PR3,SR3}_M1_{PIT,YAW}_DAMP_EST. These filter banks are found in the Pitch Estim and Yaw Estim screens under OSEM Damper and Estim Damper. The filters were copied over with a script that made sure that it was copying the filters that corresponded to the correct suspension and DOF (some of the filters differ between the suspensions as well as between DOF on the same suspension)..

The filters have all been loaded in but are currently off. The gains on these filter banks are currently set to 0.

I am attaching the script that I used to copy over these filters.

J. Kissel
ECR E2400083
IIET 30642
WP 12453

We're getting started on installing the PSL Pick-off path for the future SPI, and we want to record the values of the ALS/SQZ fiber distribution path before any work gets started -- and also see how these PD's values depend on the PSL environment. These PDs are described thoroughly in LHO:83013, but in short, there's a monitor PD internal to the PSL, on the table, and a down stream fiber-coupled monitor PD inside the ALS/SQZ fiber distribution box. 

Note, because ISCT1 has been moved out of the way for the ISI HAM1 install, the ALS COMM 2f SHG power monitor PD is unexpected to be dead, reading zero.

The good news: after the 2025-04-01 corner station vent and 2025-04-06 Power outage (LHO:83753), both ALS/SQZ path PDs report the same power as the did in Feb 2025 -- even though the PMC transmitted power is a few Watts less: 
                                            Feb 24 2025           Today (Lights OFF)      Today (Lights ON)
H1:PSL-PWR_PMC_TRANS_OUTPUT       [W]       105.0                 104.6                   104.6
H1:ALS-C_FIBR_EXTERNAL_DC_POWER   [mW]       44.6                 45.15                    45.55
H1:ALS-C_FIBR_INTERNAL_DC_POWER   [mW]       30.2                 29.8                     31.9

In LHO:83013, I reported the *log* of the power for the ALS path PDs rather than the absolute milliwats. Here, I quote both dates in absolute power [mW] for the record.

Watching the long term trend of the PD internal to the ALS/SQZ fiber box, the power swings regularly by ~2 mW. The current max is ~31.5 mW, and min is 29.5 mW.

During this morning's data, PSL environmental controls were on the fritz. My guess is that the optical fiber that feeds the ALS/SQZ internal monitor PD is quite sensitive to temperature, as you can see the INTERNAL power smoothly swing up and down. 

The free-space, on table EXTERNAL PD makes sharp 0.3 [mW] jumps when the lights are turned on and OFF, but otherwise no sensitivity to temperature. 

Finally, everything moves slightly with the PMC transmitted power, and the slightly smaller, seemingly random 0.2 [W] blips in PMC transmitted power are a result of Jason / Ryan going in and out of the main PSL room to try to assess with the environmental controls and turning on/off the lights.

Upsettingly interesting!

So, here should be our goal powers for on-table EXTERNAL PD and fiber-coupled INTERNAL PD should be somewhere around 
    Environmental Controls and Lights OFF
        EXTERNAL / ON TABLE / Free-space PD        45.2 +/- 0.1 [mW]
        INTERNAL / IN RACK / Fiber-Coupled PD      31.2 +/- 0.2 [mW]

    Environmental Controls and Lights ON
        EXTERNAL / ON TABLE / Free-space PD        45.5 +/- 0.1 [mW]
        INTERNAL / IN RACK / Fiber-Coupled PD      30.6 +/- 1.0 [mW]

Morning dry air skid checks, water pump, kobelco, drying towers all nominal.

Dew point measurement at HAM1 , approx. -42C

Tue Apr 15 10:07:33 2025 INFO: Fill completed in 7min 29secs

Edgard, Oli, Brian.

We added a folder with a script that calculates the noise budget for the OSEM estimator for an HLTS.

The folder lives in: sus/trunk/HLTS/Common/FilterDesign/Estimator/.  

The script inside is called (at least for now) PR3_noise_budget.m, and it uses the simulink diagram in the same folder to run. The diagram doubles as a diagram for the estimator scheme itself, so it can be useful to look at.

We will post more commissioning scripts in this folder later in the week.

Travis has asked for a temporary bypass on the GV7 cell phone alarms while this gate valve is soft closed

Bypass will expire:
Tue Apr 15 01:43:34 PM PDT 2025
For channel(s):
    H0:VAC-LX_GV7_ZSM179A_VALVE_ANIM
 

TITLE: 04/15 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: 3mph Gusts, 0mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.26 μm/s
QUICK SUMMARY:

Beautiful day out!  Perfect conditions to Lock H1! But instead the plan is to do the Following:
Install an ISI in HAM 1.
SPI in PSL - add ALS pickoff mirror
VAC - HAM1 Top flange Gauge work table side - GM
PSL/FIL - Moving picomotor driver, pull cables
HAM1 ISC prep - check all removed cables for loose screws, continued
HAM1 ISC prep - Inspect Optics and beam dumps, FC if needed, continued
VAC - Start Feedthru Swap, need Betsy for some cables, continued, mostly done except 1-2 small ones

Hey also this thing is still not reporting back a number when checking the Dust mons.
H1:PEM-CS_DUST_LAB2 Error: data set contains 'not-a-number' (NaN) entries

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

Today's activities:

• Feedthru installation on HAM1 was completed.  An electrical issue with one of the 25-pin feedthrus on the D1 5-way cross and/or in-vac cable means this port will be revisited after ISI installation.  Electrical testing is ongoing for the new feedthrus/cables.
• BSC8 annulus system is being pumped by aux. cart.  
• CP1 RGA is being pumped down for initial commissioning.
• Flange protection was added to the HAM1 top 16.5" port.

Randy, Corey, Mitch, Richard, Jim

ISI install fixture was installed today. Like LLO, it was kind of tricky, we installed the back (-Y) stand, Randy drove the first I-beam through and we attached to the -X side of the install fixture. The +Y side of this I-beam was then hung from the crane while we grabbed the second I-beam and attached to the +X side of the -Y stand. The outer +Y stand was then brought in to support the I-beams and we took two of the outrigger legs off the middle stand and used the crane to place it as close as we could to the middle of the I-beams. The -X outrigger was re-attached and we spent some time squaring the whole assembly up to the chamber before attaching the I-beams to the middle stand. We tried to seal the chamber up as good as we can, but we don't really have covers for this step. At this point, the fixture is pretty close to where it needs to be, but we need to set the height and pull the +Y stand out of the way. Should be ready to bring the ISI into the LVea and get started with the ISI install first thing tomorrow.