Ibrahim and I went to End Y with the PS4 Working Standard to do a PCAL End Station measurement.  We followed T1500062-V21 to complete the measurment suite with out any issues.
Here are the obligitory Before Beam spot pics.  
Martel plots for ADC conversion.

Working standard at TX module with only One beam. 

Working standard at the RX module with only One beam.

Working standard at RX module with Both beams.

Post measurement beam spots!



anthony.sanchez@cdsws25: python generate_measurement_data.py --WS PS4 --date 2026-07-16
Reading in config file from python file in scripts
../../../Common/O4PSparams.yaml
PS4 rho, kappa, u_rel on 2026-07-16 corrected to ES temperature 299.6 K :
-4.698647654693516 -0.0002694340454223 0.000750622815531554
Copying the scripts into tD directory...
Connected to h1daqnds1
martel run
reading data at start_time:  1469911700
reading data at start_time:  1469912270
reading data at start_time:  1469912670
reading data at start_time:  1469913100
reading data at start_time:  1469913500
reading data at start_time:  1469913900
reading data at start_time:  1469914560
reading data at start_time:  1469915320
reading data at start_time:  1469915650
Ratios: -0.5339859682199335 -0.543765733929218
writing nds2 data to files
finishing writing
Background Values:
bg1 =        18.671164; Background of TX when WS is at TX
bg2 =        5.156755; Background of WS when WS is at TX
bg3 =        18.605483; Background of TX when WS is at RX
bg4 =        5.281252; Background of WS when WS is at RX
bg5 =        18.674174; Background of TX
bg6 =        -1.117857; Background of RX

The uncertainty reported below are Relative Standard Deviation in percent 

Intermediate Ratios
RatioWS_TX_it      = -0.533986;
RatioWS_TX_ot      = -0.543766;
RatioWS_TX_ir      = -0.526609;
RatioWS_TX_or      = -0.535095;
RatioWS_TX_it_unc  = 0.059001;
RatioWS_TX_ot_unc  = 0.057064;
RatioWS_TX_ir_unc  = 0.061781;
RatioWS_TX_or_unc  = 0.063032;
Optical Efficiency
OE_Inner_beam                      = 0.985936;
OE_Outer_beam                      = 0.983757;
Weighted_Optical_Efficiency        = 0.984846;

OE_Inner_beam_unc                  = 0.046465;
OE_Outer_beam_unc                  = 0.047412;
Weighted_Optical_Efficiency_unc    = 0.066385;

Martel Voltage fit:
Gradient      = 1637.889101;
Intercept     = 0.085727;

 Power Imbalance = 0.982015;

Endstation Power sensors to WS ratios::
Ratio_WS_TX                        = -0.927858;
Ratio_WS_RX                        = -1.383422;

Ratio_WS_TX_unc                    = 0.047658;
Ratio_WS_RX_unc                    = 0.041564;

=============================================================
============= Values for Force Coefficients =================
=============================================================

Key Pcal Values :
GS           =      -5.135100; Gold Standard Value in (V/W)             
WS           =      -4.698648; Working Standard Value             

costheta     =      0.988362; Angle of incidence
c            =      299792458.000000; Speed of Light
             
End Station Values : 
TXWS         =        -0.927858; Tx to WS Rel responsivity (V/V)
sigma_TXWS   =        0.000442; Uncertainity of Tx to WS Rel responsivity (V/V)
RXWS         =        -1.383422; Rx to WS Rel responsivity (V/V)
sigma_RXWS   =        0.000575; Uncertainity of Rx to WS Rel responsivity (V/V)

e            =        0.984846; Optical Efficiency
sigma_e      =        0.000654; Uncertainity in Optical Efficiency

Martel Voltage fit : 
Martel_gradient         =        1637.889101; Martel to output channel (C/V)
Martel_intercept   =        0.085727; Intercept of fit of     Martel to output (C/V)

Power Loss Apportion : 
beta          =        0.998844; Ratio between input and output (Beta)  
E_T          =        0.991820; TX Optical efficiency 
sigma_E_T          =        0.000329; Uncertainity in TX Optical efficiency 
E_R          =        0.992968; RX Optical Efficiency 
sigma_E_R          =        0.000330; Uncertainity in RX Optical efficiency 

Force Coefficients : 
FC_TxPD          =        9.158396e-13; TxPD Force Coefficient 
FC_RxPD          =        6.237025e-13; RxPD Force Coefficient 
sigma_FC_TxPD          =        4.417816e-24; TxPD Force Coefficient 
sigma_FC_RxPD          =        2.847865e-24; RxPD Force Coefficient 
data written to ../../measurements/LHO_EndY/tD20260804/
 

WP13482

Jim, Erik, Dave:

h1seiey was powered down: computer, IO Chassis and AI chassis.

The IO Chassis A2 Adnaco backplane was replaced with a spare. The original backplane's slot3 failed during O4 (Oct 2025) and back then we shifted the cards left by one slot to avoid it.

I was then able to put the cards back into their original slots, making h1seiey identical to h1seiex. This meant A3 now had no cards installed, so I disconnected the A3 fibers from the rear of h1seiey.

For backplane testing we stopped the models from running to verify all the cards are seen. Auto start was turned back on, the system was powered up, the models started and lastly I powered the AI chassis back on.

Masayuki Nakano, Khanh Vu

We successfully closed all of the JAC ASC loops. Attached below are the outputs from the two wavefront sensors. All of the signals converge to zero within approximately 30 seconds, indicating that the loops are working beautifully. More details will be reported tomorrow.

TITLE: 08/04 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY:

Slow day due to ongoing FAC water and outdoor air quality issues but the following was done:

• HAM7 Power measurements
• JAC Beam profiling at IOT1 and power measurements and IOT2L
• Scissor lift work
• Gate phone work
• PCAL EY Measurement
• Seismic work (Jim) on HAM2 electronics and ITMX

LOG:                                                                       

Jennie Wright, Masayuki Nakano, Khanh Vu

This morning we worked on several tasks on the IOT1 table, including installing the camera and shutter, profiling the beam, and calibrating the DC power.

We identified a new location for the camera using the beam transmitted through JACR_M5. During this process, Masayuki noticed that the beam was being clipped by the shutter. We suspect that the beam may have been clipped for some time. We then installed the camera in its new location, and Masayuki aligned the shutter on the table.

Next, we profiled the beam for the wavefront sensors. We found that the Gouy phase separation between the two WFSs is approximately 70 degrees. We decided to leave the current configuration as it is since the separation is good enough. Masayuki will make a plot and perform a more detailed calculation later.

We also maximized the laser power in the REFL path by optimizing the waveplate angle. When JAC is unlocked, the measured power on the RFPD is 5.1 mW, and the trigger PD voltage is 0.28 V. When JAC is locked, the measured power decreases to 0.4 mW, and the trigger PD voltage is 0.02 V. Since the beam is split evenly, each WFS receives approximately 2.55 mW of optical power.

Finally, we calibrated the DC readout of RFPD by converting counts to mW. Before performing the calibration, Masayuki checked the alignment and recentered the RFPD. He then recorded two sets of measurements, each averaged over 10 seconds:

Measurement #1

* JAC_REFL_A_LF_INMON: 1072.3966186523437 counts
* DC power: 4.4 mW

Measurement #2

* JAC_REFL_A_LF_INMON: 1073.5228637 counts
* DC power: 4.5 mW

After the calibration, we updated filter number 10 with the new coefficients.

TITLE: 08/04 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, 1mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.08 μm/s 
QUICK SUMMARY:

IFO is in IDLE for MAINTENANCE

Today, we anticipate some Ion Pump work from Vacuum and some comissioning work after Tues Maintenance

Workstattions were updaed and rebooted.  This was an OS packages update.  Conda packages were not updated.

FAMIS 63910

Last Tuesday's interlock work and brief time in the enclosure are clearly seen on many trends, and essentially everything came back as expected. One item of note is the PMC, which relocked at a slightly higher temperature, which seems to have caused the transmitted power to be a bit lower while the reflected power is a bit higher.

[Keita, Elenna]

Sheila and I struggled to lock SRY last Friday, 91360. Keita and I revisited today.

To start, I ran the usual SR2 alignment, which centers the beam on AS_C, and the AS centering which centers OM1,2 on AS A and B.

Then, we could see a large beam at the center of the AS AIR camera, and a strange fringing beam at the top edge of the camera. We swept SRM in both pitch and yaw to both edges and saw the beam disappear. This convinced us that we were seeing the two beams we needed to overlap in SRY, however, there was not an SRM alignment that could overlap the two beams.

Keita first moved ITMY 10 urad in pitch, and was able to overlap the two beams. He then undid that alignment and moved the beamsplitter instead. We were able to achieve the SRY fringing and then lock SRY with the guardian. The resulting beam ended up on the top edge of th AS AIR camera view.

Using that beamsplitter alignment, we then relocked MICH dark, which required a large movement of ITMX, since we had decided to maintain the beamsplitter and ITMY alignment. ITMX is now at P: -135 and Y: 113.1 on the sliders. This means it has been moved relative to where it should be according to a previous arm alignment we achieved.

We can still see the MICH fringes on the ISCT1 refl camera with this alignment.

We can also lock PRX, with a movement of PRM. We still see no beam on POP A or B, so Keita is scanning the input alignment.

The attached screenshot shows the alignment sliders after we locked SRY, MICH, and PRX.

I'm not sure if we are happy with this alignment overall, since we're not sure if this is where we want the ITMs.

Per WP 13472  updated h1daqfw0 to use the new auto-reconfiguring frame writer.  This is the same code has been running on h1daqfw2 for months in a test mode.

I also did an inplace upgrade of h1daqfw0 to Debian 12, which is what h1daqfw2 is running and what we have tested as.

Erik helped with package wrangling for Debian 12.  I had been running h1daqfw2 from the experimental repository (which is a snapshot of the continous integration system).  We were able to move this from using the experimental repository to the unstable repository.  We will move it up to production later.  We don't have a full Debian 12 release of advligorts as we are not planning on supporting the rcg and real time code on Debian 12.

Dave and I will be watching the timings and checksums to make sure everything looks good.  The IO setup is a bit different between h1daqfw2 and h1daqfw0 (fw2 writes to local disk, fw0 to a NAS).

TITLE: 08/03 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: 11mph Gusts, 7mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.07 μm/s 
QUICK SUMMARY:
The well pump was not working today due to some electrical issue. Last I heard FAC had a contractor on site to check on the well. So there is limited amounts of water here. Many folks were asked to work from home if they can. 

GRB-Short E644098 @ 17:29 UTC

Jonathan started working on the FrameWrite0 today, installing Deb12 OS. 

End stations were misaligned today to some tests that Camilla was doing.

ITMX ISI Stage 1 & 2 WD tripped twice today. Jim went out to the CER today to fix this.

Vac Team did some work on the GV6 Gate Valve today and GV6 is currently Open on the Y arm, But GV5 is still closed so the corner volume is still not open to the Arms yet. 

Keita and I took an opportunity while JAC was offline to run all the dark offsets. I ran the usual dark_offsets_exe.py from userapps isc/h1/scripts/dark_offsets

I did not visually check all of them but the ones I compared before and after in SDF looked reasonable.

Some of the whitening gain settings have been set strangely for the vent, so this should help fix that now that we have reset the proper settings.

SDFed, see screenshots.

After we ran, Keita and I realized the whitening settings for POP B were still wrong, so I corrected them and reran the offset for the POP B segments. Added screenshot.

Sheila, Ryan S, Camilla

We spent the morning repeating 90783, now that ZM4 preloading has been adjusted (90951) and ZM5 has been swapped and now has a different preloading than our O4 ZM5 (91292):

• Using SQZ ASC with ZM4 and ZM5 to get ASC_A and ASC_B centered, we needed to move SRM to stop saturating ZM4/5,
• then locking OMC on 00 touching up OMC and OM3 alignment to maximize 00 peak,
• then putting these ASC-OMC offsets into H1:OMC-ASC_QPD_A/B_PIT/YAW_OFFSET so that the OMC ASC will put us in this good location. 

Sheila then used her script to run OMC scans at a grid (below) of PSAMS locations. These initially look great, showing sqz to omc mode mismatch is as good as 1%. with some alignment fluctuations. Ndscope of data taking attached. 

Ryan then took M^2 measurements on SQZT7 of a slightly different grid:

Travis, Gerardo, Jordan

During the closing of GV6 back in May, we noticed that there was some blow-by in the pneumatic system when trying to hard close the valve, see alog 90093. 

We were able to hard close the valve eventually but as preventative maintenance we wanted to replace the air cylinder seals, similar to GV7.

Prior to disassembly we measured the locations of the reed switches from the top surface of the bottom plate to the bottom surface of the reed switches:

Bottom Switch: 1 1/8"

Top Switch: 49 1/4"

We then disassembled the air cylinder and replaced the seals following procedure/notes collected during the GV7 repair. During cleaning of the old grease on the piston head, we noticed there were two burrs on the top of the piston, we did not notice any damage to the inside of the cylinder, but as a precaution we used a small flat file to remove the burrs. We also chased the threads on the four threaded rods with a die to aid with reinstallation. After cleaning and inspection of the cylinder tube, we found no issues or damage so we decided to continue to use that cylinder and keep the new one as a spare.

No other issues encountered, we removed the old seals, cleaned the grooves, added copious amounts of the supplied grease to the o-rings, seals and the inside of the air cylinder, and then re-assembled the cylinder tube. Pictures posted below and a final procedure is in progress and will be posted to the DCC.

We did not get a chance to cycle the valve after the seal replacement, so we will continue tomorrow with cycling the valve.

I used the earthquake down time from the weekend to look at the health of the BSC2-ISI sensors.

Sensors look OK (including the newly replaced H1 L4C - see alog 90840) except for CPS ST2 H1 (see red curve on the last plot) with large noise below 1Hz. This will need an investigation (I would start by swapping cables at the field box to see if it's an in-chamber issue).

Dtt Template lives under /ligo/svncommon/SeiSVN/seismic/BSC-ISI/H1/BS/Data/Spectra/Undamped/bs_all_sensors.xml