M. Todd, G. Vajente, L. Dartez

Wednesday 12/17

1. Additional optics mounted
   1. ZnSe 2” lens
   2. 2” silver and gold flipper mirrors (not installed)
   3. Additional beam dump for reflection of Polarizer2
2. We had the PD chassis milled out further to take an offset out that prevented the board from sitting flush.
3. We noticed that the coating had been burned on the first beam sampler we got from EdmundOptics. Emailed vendor to ask if this is common, because the power density is not at all expected to have produced this.
4. We also took beam profiles with a rail installed to get a fit of the beam evolution between M2 and M3. I made a fit of the data, assuming that M2 was perfect (I was having trouble with the nonlinear fit without M2=1, will revisit).

To do tomorrow:

1. Try and compare the lens solution to the fitted q we have from measurements.
2. Try and set up the coaligned visible laser

[Sheila, Robert, Eric, Daniel, Karmeng]

By blocking and unblocking the beam from the OFI heading into HAM7, we see 1uW on H1:IOO-OFI_PD_A_DC_POWER, which is measuring power after a 99% splitter (B:BS1, E2000450, 99% reflective for s pol light at 45% AOI).  

Scattered light entering HAM7: average of 25.66uW and STDev 1.066uW. Single bounce from IFO, with input power of 9.2W. With 9.2W on PRM we expect 9.2W * 0.03 (PRM) *0.25 (BS) * 0.32 (SRM) = 22mW incident on the OFI, so this implies that the leakage towards HAM7 is 0.1% of the beam incident on the OFI; 29dB.  This implies that the isolation of this path from the main beam is better than what we infered assuming 1% transmission from B:BS1 in 87350, and is close to the isolation assumed in T1800447.  

We also measured the polarization of the beam by measuring the beams after they hit the polarizer on SFI2.  Consulting the diagram on page 8 of T1900649, this polarizer is set to transmit vertically polarized light and deflect horiztonal to hit the aperature which isn't labeled in the diagram.  We measured the beam between the rotator and the second polarizer (B:P1),after the aperture, with average of 14.07uW and STDev of 1.587uW.   This implies that the beam coming from the OFI is 55% vertically polarized.

Revisiting 87318 in light of these measurements.  If the polarization and splitting ratio of B:BS1 in full lock is the same as single bounce, this implies that we had 0.75mW scattered towards HAM7 from HAM5 in full lock.  Using the 4% transmission of this diode (and assuming that 30% of the AS light is carrier, which I want to double check), we need a reflectivity of 3% from some scatter source after the beamsplitter to explain the 12nW of scattered light reaching the DCPDs.  

  The thin film polarizer on the OFI should have an extinction ratio of 1:10,000 E1900285.  Also, in 88105 I moved the temperature of the OFI while we were locked and saw that we couldn't significantly decrease the scattered power that way.  

Fil, Oli

The JM1 and JM3 filter banks were populated, with some things that need updates found along the way.

JM1 and JM3 were populated based on PM1's filter banks. The only banks that aren't the same as PM1 are the OSEMINF and WD_OSEMAC_BANDLIM satamp compensation filter modules and the COILOUTF filter modules.

First, I filled out all the filter banks as a direct copy of PM1 using python3 /ligo/home/oli.patane/Documents/WIP/copySUSfilters.py PM1_M1 JM1_M1 (then replacing JM1 with JM3). This script copies over the filter modules in OSEMINF, COILOUTF, WD_OSEMAC_BANDLIM, WD_OSEMAC_RMSLP, LOCK, and DAMP filter banks. However, the OSEMINF,  WD_OSEMAC_BANDLIM, and COILOUTF filter banks are not the same as PM1, so those need to be updated.

OSEMINF and WD_OSEMAC_BANDLIM filter banks
In November (88162) the JAC electronics were installed and the satamps that were suppposed to be installed were S2500406 for JM1 and S2500407 for JM3 / PM1. Both of these are modified satamps per ECR E2400330. JM1 had the correct satamp installed but JM3 / PM1 had S1200173 installed instead, which is not modified and has a different frequency response. 
JM1 - JM1 has the correct updated satamp, which Jeff measured the frequency response for each chassis' channels for, so I updated the compensation filters for JM1 with the exact compensation based on the measurements for each channel. I ran python3 sustrunk/Common/PythonTools/satampswap_bestpossible_filterupdate_ECR_E2400330.py -o JM1 to fill out each OSEMINF FM1 and WD_OSEMAC_BANDLIM FM6.
JM3 / PM1 - On the flip side, the compensation filters for JM3 and PM1 are the same as what PM1's have been - 10:0.4: zpk(10:0.4:1) in OSEMINF FM1 and WD_OSEMAC_BANDLIM FM6.

COILOUTF filter banks
The coil driver for JM1 is S1106042, and the coil driver for JM3 is S2500411.
The PM1 coil drivers have had ECR E2200307 done, which affects the filter in FM6, and I've been searching to see if I can verify whether the JM coil drivers have had this (or the expansion ECRs, E2200307 or E2400048) done to them.
JM1 - The e-traveler doesn't mention it having been modified, just that it was taken out of production and replaced with a modified one (64166). I haven't been able to find anything anywhere that mentions that it ended up getting modified, so I am inclined to think that it might not have this modificiation. Thus, for now I am installing the filters that work for the unmodified driver. These filters are:
    - AntiLPM1: zpk([0.9;211.883],[9.99999;20.9999],1,"n")
JM3 - The e-traveler for the driver says that it's been modified per T2100410, which is the modification that is done as part of the ECRs mentioned above, so JM3 coil driver is modified and thus has the same AntiLPM1 filters as PM1. These filters are:
    - AntiLPM1: zpk([0.5;3174],[52.32;50.77],1,"n")

JM1 OSEMINF, WD_OSEMAC_BANDLIM, and COILOUTF filter banks, COILOUTF AntiLPM1 foton

JM3 OSEMINF, WD_OSEMAC_BANDLIM, and COILOUTF filter banks, COILOUTF AntiLPM1 foton

All of these filters have been loaded in and commited to svn as r34277.
We are hoping that the modifications they are supposed to have will be able to be done soon.

Erik, Rahul, Jeff, Fil, Oli

Earlier today we realized that the JM3 model ADC inputs did not match up with the cabling documentation. The documentation lists the order of the OSEM PD inputs into the AA chassis as JM1: CH 0-3, JM2: CH 4-7, JM3 CH 8-11. However, the h1susham1 model had the inputs for JM3 as CH 4-7, accidentally forgetting to leave room for the maybe-one-day JM2. This resulted in a bit of confusion until we figured this out. We temporarily moved the JM3 OSEM PD to AA chassis cable into the CH 4-7 inputs to match with the model so installation work could proceed, but once they were done we wanted to change the model to match up with all the documentation we had. To do this I just edited the h1susham1.mdl file and changed the JM3 ADC numbers from 1_4,1_5,1_6,1_7 to 1_8,1_9,1_10,1_11 and committed the model as r34274 (before, after). I then also updated susjm3_overview_macro.txt to have those adc number match and that was committed as r34275.

Erik restarted the h1susham1 model and everything came back fine (88581). Since earlier we had swapped the OSEM PD cable for JM3, the JM3 readouts currently look like nothing because we still need to swap that cable back to its correct spot tomorrow.

[Daniel D, Kar Meng, Sheila, Eric]

Today we continued with the VOPO install.  The pump beam is now aligned to the cavity.  Unfortunately, the cavity axis was different enough that we had to walk things quite a bit to optimize the alignment.  We double checked the mode matching for the pump path with the new cavity and it is sitting at around 85% with 15% in the bullseye mode.  

We also roughly aligned the CLF path by aligning the CLF reflection to the green transmission.  We then switched to the seed beam with the injection power turned up all the way and were able to see a beam on the card when the cavity is scanning.  Currently, the transmitted beam is clipping on SFI 1.  We will continue with the alignment tomorrow and finish optimizing the seed beam once we can get far enough down the SQZ path to reach a PD. 

TITLE: 12/18 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:

IFO is in IDLE for PLANNED ENGINEERING

Lot's of good progress today:

• HAM7 Scattered light investigation - ONGOING - Green light is aligned to OPO from light pipe, and red is roughly aligned  - alog 88571, 
• HAM1 Go into PSL and add lenses - UNDONE 
• HAM1 install periscopes - DONE (build alog 88574)
• HAM1 load in/stage all JAC hardware, plug in JM1 and JM3 to start testing controls - ONGOING - dealing with some controls/osem issues on JM1. Continuing tomorrow - alog 88578
• BSC2 FARO work - ONGOING - Jason and Ryan C are still in the LVEA

Other:

• DAQ Restarted + misc CDS work - alog 88577OK
• JAC infrastructure added to medm and guardian by OPS (Ryan S, Ryan C, Oli, TJ) - alog 88570
• SATMON Updated for new 28 bit DACs - alog 88573
• HAM3 CPS glitching fixed
• Sensor correction is off due to IAS work
• IMC is unlocked, light pipe is off/shuttered overnight

Will edit to add alogs that are submitted after shift.

LOG:

Betsy, Fil, Rahul

Today we kicked started the installation activities in HAM1 chamber for the Jitter Attenuation Cavity (JAC). Given below are the things we placed on the ISI table - they are all roughly positioned and dog clamped. 

1. Tip Tilt JM1 - now connected to electronics chain, having some issues with the bosem adc counts etc, will continue looking into it.

2. Tip Tilt JM3 - now connected to the electronics chain, bosem centered, will proceed for health checks once the chassis and electronics chain looks okay.

3. The two periscopes for the JAC, Type 121 and 132 - assembly report posted by Jennie - 88574.

4. Some optics on Siskiyou mount were also added to the table.

I am attaching pictures which shows the above mentioned things added to the table - and for comparison a picture showing before any addition was (here) made.

Fil also performed group loop checks on JM1 and JM3 and did not find any issues with them.

[Oli, Erik]

Oli rearranged some ADC channels to match the current design.  The model was rebuilt and restarted.  No DAQ restart needed.

Dave, Jonathan,

We restarted the daqds today, daq1 leg at 15:56, and the daq0 leg at 16:01 localtime.

This was in support of two workpermints

12945 - monitoring the daq kafka connector as we push data into the NGDD system in ldas (NGDD = next generation data delivery)

12946 - TJ added two guardian nodes to help manage JM1 and JM2

Wed Dec 17 10:11:51 2025 INFO: Fill completed in 11min 47secs

Jennie W, Rahul, Betsy

Yesterday Rahul and I built two periscopes for the beam translation from input PSL beam in HAM1 to table height for JAC input and output of JAC back to beam height required for beam into HAM2 input periscope.

The one between the PSL and JAC is type -121 in drawing LIGO-D1201342. Left-side in pic.

The one between the JAC and HAM2 is type -132 in drawing LIGO-D1201342. Right-side in pic.

We had to leave off one of the hex screws that attaches the periscope stiffener (part 26) to the periscope base (part 20) as the hex screw hole thread became stripped and we could tighten it. I think this is either part number 7 or 19. These are two hex screws of different lengths and we tried both but neither would tighten. Betsy and Rahul decided that the structure seems stiff enough without it.

Extra pic of Rahul and Betsy with one of the periscopes.

At the end Betsy and Rahul weighed the two periscopes.

Here is 121 and here is 132.

I've updated the saturation thresholds on SATMON for the following suspensions which have had their DAC cards upgraded to 28bit earlier this week. I still have to add JM1 and JM3.

RM1 (M1)

RM2 (M1)

PM1 (M1)

IM{1,2,3,4} (M1)

PRM (M1, M2, M3)

PR3 (M1, M2, M3)

After taking the first tranfer function, we saw Length look weird, so we measured the wire lengths then replaced one of the wires and remeasured JM3. Before replacing the wire, and after replacing the wire. The wire replacement made everything look nicer, shifted the peaks into a more correct location. While it is still not perfect and looks a little different, we should be able to damp it, the magnitude differences are likely from the coil drivers. 

The measurements are located in: /ligo/svncommon/SusSVN/sus/trunk/HTTS/X1/JM3/SAGM1/Data/

After replacing the wire:
2025-12-11_2300_X1SUSJM3_M1_WhiteNoise_L_0p02to50Hz.xml
2025-12-11_2300_X1SUSJM3_M1_WhiteNoise_P_0p02to50Hz.xml
2025-12-11_2300_X1SUSJM3_M1_WhiteNoise_Y_0p02to50Hz.xml

Before replacing the wire:

2025-12-11_2000_X1SUSJM3_M1_WhiteNoise_L_0p02to50Hz.xml
2025-12-11_2000_X1SUSJM3_M1_WhiteNoise_P_0p02to50Hz.xml
2025-12-11_2000_X1SUSJM3_M1_WhiteNoise_Y_0p02to50Hz.xml

Ryan S and I edited the sustools.py, susconst.py, and created SUS_JM{1,3}.py, then started the two new nodes. Other than the susconst file, these are common code so I will let LLO know. There were a few inconsistencies and it looks like PM1 was forgotten in a few places so we added those instances in. That node has been working so I don't think it has been an issue, but now it's consistent with the other nodes.

We briefly tested the node by tripping the suspesion, which isn't actually hooked up yet, and running it through all but its coil switching states. All good. Ryan and possible others will edit the medm screens that needs the new JMs on them. 

TITLE: 12/17 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: 40mph Gusts, 26mph 3min avg
    Primary useism: 0.15 μm/s
    Secondary useism: 0.59 μm/s 
QUICK SUMMARY:

IFO is in IDLE for PLANNED ENGINEERING

A look at today's activities:

• HAM7 Scattered light investigation
• HAM1 Go into PSL and add lenses
• HAM1 install periscopes
• HAM1 mode matching check-in
• HAM1 load in/stage all JAC hardware, plug in JM1 and JM3 to start testing controls
• BSC2 FARO work

M. Todd, G. Vajente, L. Dartez

Tuesday 12/16

1. This morning we got the power monitor working with the old ICS computer that seemed to have the software on it already. We were not able to get the QPD software working because it requires Windows10 or newer; of course, this is only temporary because the other signals will be routed into the bekhoff eventually.
2. We got the package that arrived today with the beam profiler, and pins for the PDs. We took out the socket from one of the PD boards, but decided to have the chassis machined which should allow the sockets to fit in the chassis correctly.
3. We began, and made significant progress, on the alignment process for the optics. We got the beam mostly aligned well through all the optics, including lenses, to the output of the optics table. A few caveats
   1. We added a dogleg to the initial laser path so that the cables going to the feedthrough panel would not interfere with the laser .
   2. The first leg of the beam path along the long edge nearest to the rotation stage does not have enough room and will need to be readjusted.
   3. We will want to put the profiler in near the exit to see if the telescope is functioning as designed.
   4. The ZnSe lens needs to be mounted as well as the flipper. We still need to test the flipper.

[Betsy, Masayuki]

Assembly drawing: https://dcc.ligo.org/DocDB/0126/D1600270/006/D1600270-v6.PDF (Type-10)
    •    A #8 flat washer was installed between the body and the beam-blocking hole cover.
    •    Six strain relief PEEK blocks (D1700101) were installed.
    •    A heater cable (D2500337) was plugged into one of the heaters. The other heater is not yet connected, as we decided to complete the wiring after confirming its polarization.
    •    The JAC body assembly was weighed. Including these parts, the total weight was 17,781 g. This measurement includes the end covers (D1700031) with a total of four screws (two per cover). The end covers need to be weighed separately and subtracted to determine the actual body weight. (the weight will be summarized in the weight tab of the component list)
    •    Note that the screws used to fix the strain relief are not vented screws. These will need to be replaced once the correct vented screws are received.

[Jason, Betsy, Masayuki]

Two arises are installed into HAM1 chamber. They will be used as the alignment reference for new PSL modematching lens installation.

• Assembled a Thorlabs ID12 iris mounted on a 0.5-inch post with a post holder and BA2 base.
• The assembled iris was temporarily placed inside the chamber and secured with a dog clamp.
• Transitioned to laser hazard.
• Performed rough alignment using a sensor card, followed by fine alignment with an IR viewer, to center the beam through the iris.
• The beam path is offset by ~+5 mm in the +y direction from the ISI design center; this is not considered a significant issue.
• The iris location is marked with a blue circle in the attached figure.

Next step: move to the PSL and install the new mode-matching lens, likely tomorrow. This will break the IMC mode matching; IMC relocking will not be possible until the JAC installation is completed.

We started installing electronics chassis for JAC:

• Heater driver, S2500960.
• DB9 breakout panel, S2500958.
• PZT driver, S2500954.
• RF doubler: S2500737.
• RF amp: S1000637 (was already installed).
• Two sat amps for JM1 and JM3, S1106042 and S2500411.

Still missing:

• Two 4-chn WFS demod chassis.
• Two AA chassis.
• JAC in-vacuum electronics interface chassis.

The necessary coax cables were also installed and terminated where possible.