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.

[Daniel D, Kar Meng, Eric]

We made a bit of progress witth the new VOPO install.  The cavity is now dogged down with all cables installed.  We started to align the green path.  Horizontal alignment looked pretty good after the swap, but the vertical alignment was actually a little off.  We suspect that the cavity axis is tilted a bit between the old and new cavities.  Its also possible that the green fiber mount just got bumped when we were swapping out the cable in the bracket behind the VIP yesterday.

After walking the vertical alignment a bit we are now seeing green flashes and are near the center of the green refl iris on SQZT7.  We plan to finish aligning once we set up the pzt driver and scope tomorrow.  The CLF alignment looks quite off at the moment.  We'll align the clf to the transmitted green beam once the former is optimized.  

TITLE: 12/17 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: Busy afternoon! We changed plans a bit after we remembered that the HAM7 crew needed the IMC locked for their scattered light investigation, so work in HAM1 and the PSL to prep for JAC installation was put on pause. Locking the IMC went fairly smoothly; MC1, MC3, and the IMC PZT were moved back into alignment based on top-mass OSEMs from when the IMC was last locked, and once the light pipe was reopened, the IMC locked without issue. Input power was brought up to 10W at the HAM7 team's request. Scattered light work in HAM7 will continue tomorrow, but for tonight we've shut the PSL light pipe and lowered input power back down to 1W since chambers are open.
LOG:

[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.

BBSS Inspection Fixture (D2200364) parts were fit-checked and helicoiled. Since we need the actual container for the full assembly, I tried to assemble everything but that which was:

1. Inspection Ring Assembly - ~100 "feet" (D2400031) were helicoiled, 12 of which were attached successfully to the inspection rings (which also were helicoiled)

2. The locating shaft (D1000347) and sleeve (D1000346) were fit-checked with the set screw and helicoiled. The 3/8-16 screws that go into the helicoils are too tight for some to go in so I left the tangs in until I can investigate either. This is the only weird thing I encountered.

3. Wing nuts and other holes were fit-checked and fit well and easy.

See pictures attached.

[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.

(Jordan, Travis, Gerardo)

The relay tube connecting HAM5 and HAM7 was removed.  We had a few snags while removing it, for some reason the space between bellows is tight, perhaps due to the difference between pressure states, one chamber is under vacuum the other is not.

After the tube was out, the viewport was installed on a short assembly, the viewport and the entire assembly was leak checked and no leaks were found.  He background a the leak detector remained at 1.0x10^-10 torr*l/sec during the leak testing.

System is currently being pumped down via a small turbo plus an aux cart.

Mon Dec 15 10:07:40 2025 INFO: Fill completed in 7min 37secs

Some more details on the build of h1sush12 IO Chassis Mon 15Dec2025.

Card layout:

h1sush2a's IO Chassis was rebuilt to be h1sush12.

The original ADC0, ADC1, BIO0, BIO1 and BIO2 cards were left in place, including the ADC ribbon cables and interface cards. The BIO field cables had enough slack that they did not need to be disconnected to pull the chassis out from the rack. All the other field cabling was disconnected for the upgrade.

The 7 18bit-DAC cards were removed, along with their ribbon cables and interface cards.

The one ADC from h1sush2b was removed from its chassis and installed as ADC2 (inc. ribbon and IF).

A new ADC was installed for the 4th ADC (JAC), it had been tested in x7sush12.

Following the hardware upgrade we remembered that the LIGO Timing Card needed a Firmware upgrade to run the LIGO-DACs. Marc upgraded h1sush12 Timing Card inplace using the JTAG port connected to his laptop. While he was there, he also upgraded h1susauxh2's Timing Card.

List of the 7 18bit-DACs removed from h1sush2a (in their bus order, DAC0-DAC7):

h1sush2b's 2 18bit-DACs and 16bit-DAC were left in place and the chassis remains powered down, as does the MSR computer.

Jeff, Oli, Jonathan, Erik, EJ, Dave:

A new h1susim model was installed at 10:18. Some BIO slow channels were removed and a DAQ restart was required.

Later at 11:52 a new h1susham1 model was installed to correct some ADC bus selectors. No DAQ restart was required at this time.

DAQ Restart:

DAQ was restarted for h1susim model change, and we took the opportunity to add in an EDC restart to remove h1sus[h2a,h2b] channels and add corresponding h12 channels.

New H1EPICS_[FEC,SDF,CDSMON].ini files were regenerated.

IFO is IDLE in ENGINEERING

The LVEA has just been transitioned to LASER HAZARD following the venting of the Relay Tube.

Vent work continues with the following progress:

• LVEA Laser Hazard Transition - DONE
• HAM1 - Set irises on table to capture PSL beam pointing - ONGOING
• HAM1 - Go into PSL and add lenses -AFTERNOON
• HAM7 - Start deinstall relay tube, install viewport adapter on HAM5 side - AFTERNOON
• HAM7 - In-chamber OPO work continued - AFTERNOON
• HAM1 - Load in/stage all JAC hardware, plug in JM1 and JM3 to start testing controls - AFTERNOON
• HAM1 - Install periscopes - ONGOING
• BSC2 - FARO work - ONGOING

Other:

• DAQ Restart 10:18 PT to 10:57 PT
• There is a vacuum pump running near HAM7 reni
• Craning work in north bay LVEA
• Jeff and Oli working on SUS models

Ryan S will take over ops shift for the next few hours.

J. Kissel, O. Patane

After sorting the ADC readout issue (LHO:88550), the existing HAM1 HAM tip tilt suspensions (HTTS), RM1, RM2, and RM1 are now functional, damped, and aligned. They're running on the newly merged sush12 computer / IO chassis and following the drawing D0902810-v12. See analog changes in LHO:88519 and software changes in LHO:88527.

The only "interesting" thing is that these SUS used to run on a 16-bit DAC, and thus it's the first suspensions whose DACs have been upgraded that were never 18- or 20- bit DACs, as has been true of all other upgraded suspensions to-date. 
Thus there is a design choice here: for all originally 18-bit DAC suspensions, we've been putting a compensating gain in the COILOUTF banks' FM10 so tht no upstream loop that drives the suspension stage needed to account for the factor of 2^20 / 2^18 = 2^4 = 4x or 2^28 / 2^18 = 2^10 = 1024x change in gain calibration, with the filter bank named after the DAC, e.g. "20BitDAC" or "28BitDAC," respectively. For these suspensions, the "the loop won't see a difference gain" would therefore be 2^28 / 2^16 = (2^28/2^18) * (2^18/2^16) = (1024x) * (4x) = 4096x change.

For these suspensions, we could either put this factor of 4x 
   (1) In the "28BitDAC" filter bank in FM10, and have the *value* of that bank be different for these suspensions (4096x) vs. other suspensions (1024x).
   (2) Make the "28BitDAC" filter bank in FM10 the same (the factor of 1024x), and compensate the loops further upstream.

Today, we chose (2).

That leaves four places to compensate:
    (a) DAMP the local damping loops
    (b) TEST the test banks from which we usually drive the "health check" transfer functions.
    (c) OPTICALIGN the banks from which we drive alignment offsets
    (d) LOCK the filter banks that receive and alter the ASC centering loops as necessary.

We've chosen to install the factor of 4x within the gain_{L,P,Y} FM4 filters for (a) [see filter file changes]. For all other banks, I've installed the factor of 4x directly in the EPICs gain field [see SDF file changes].

That means all existing SUS in HAM1 are fully functional on the newly merged sush12 computer / IO chassis and following the drawing D0902810-v12. See analog changes in LHO:88519 and software changes in LHO:88527.

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.