Edgard, Oli

We took measurements to get the above-resonance OSEM response of the PR3 and SR3 suspensions to characterize the gaines. This is a follow up to the in vacuum measurements on 80863, and to the estimated calibrations from 83605.

For PR3, the measurements were taken with 

- all of the M1 damping loops at a gain of -0.2 (instead of the nominal -1).
-The coil driver filter in state 1 (similar to the measurements that Jeff took).
- The ISI state was ISOLATED, but HEPI is locked, so we circumvented guardian by sliding off the Isolation Gain on HEPI. This should not affect the measurements for the OSEM calibration.

The results are saved in:
/ligo/svncommon/SusSVN/sus/trunk/HLTS/H1/PR3/Common/Data/

         2025-04-15_1431_H1ISIHAM2_ST1_WhiteNoise_PR3SusPoint_L_0p02to50Hz.xml
         2025-04-15_1431_H1ISIHAM2_ST1_WhiteNoise_PR3SusPoint_T_0p02to50Hz.xml
         2025-04-15_1431_H1ISIHAM2_ST1_WhiteNoise_PR3SusPoint_V_0p02to50Hz.xml

The similarly named _tf.txt files are stored in the same folder, and they export the measured M1 transfer functions using the [ L T V R P Y ] order.

Back in August 2023 the damping gains for SR3 were reduced from -1 down(up?) to -0.5 to help with noise in DARM (72130). Since that change, we had never taken a set of transfer functions with the damping loops on with these new gains, so today I took those. The resulting transfer functions don't show too much damping, which is expected.

The data can be found in ../HLTS/H1/SR3/SAGM1/Data/2025-04-15_2000_H1SUSSR3_M1_WhiteNoise_{L,T,V,R,P,Y}_0p01to50Hz.xml, and has been committed to svn as r12228.

The results can be found in ../HLTS/H1/SR3/SAGM1/Results/ as 2025-04-15_2000_H1SUSSR3_M1_ALL_TFs.pdf and 2025-04-15_2000_H1SUSSR3_M1.mat, and have been committed to the svn as r12229.
 

TITLE: 04/15 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:
ISI is installed , but more work need to be completed before Optics can be installed.
PSL & SPI team are still in the PSL & anti Room, they have installed a beam splitter nut more work may be required.
Jason setup some Faro equipment.
Vacuum team started to pump down the BSC8 annulus door volume.

LOG:

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