[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.

I've created macro files for JM1, JM3, and JM ALL, and there are new SUS medm screens in the sitemap in the dropdown that was previously named IM/RM/PM but is now named HAM12 HSSS. In the process of making the JM ALL screen, I also made the RM ALL screen more generic so it can be more easily copied in the future. Also also, the macro files for RM1, RM2, RM ALL, and RM1 have all been updated to have the correct readouts the correspond to the DAC upgrades. All these changes have been committed to the svn

Macro files: userapps/sus/common/medm/sus{jm1,jm3,jmall,rm1,rm2,rmall,pm1}_overview_macro.txt r34219

JM ALL, RM ALL medm screens: userapps/sus/common/medm/hsss/SUS_CUST_{JM,RM}_OVERVIEW_ALL.adl r34218

Sitemap: userapps/cds/h1/medm/SITEMAP.adl r34220

J. Kissel, O. Patane, D. Barker

Oli and I have moved on to recovering the SUS RM1, RM2, and PM1 post their migration from the h1sush2b computer / h1sushtts front-end model into the newly merged h1sush12 computer / IO chassis system and h1susham1 front-end model yesterday (see LHO aLOGs 88519 and 88527). We immediately noticed that all the raw OSEM ADC inputs were digital 0. We opened up the ADC MONITOR screen and found this auto-generated screen completely blank. Popped open the IOP for the whole computer to check it's report of these ADC cards, and they appeared normal. See attached MEDM screen collection.

Dave and I opened up the new h1susham1 front-end model and found that the bus selectors that were parsing the ADC2_2_HTTS and ADC3_2_HTTS goto tags were configured to read the Direct I/O Chassis ADC blocks' internal bus creator / output name rather than the card number. It's easier shown than described -- check out the before (r34117) vs. after (r34217) top level model.

I fixed this as one usually does -- 
    - double clicking on the bus selector, 
    - highlighting the channels from the "Signals on the bus" list that you want (which say, e.g. "adc_0_16, adc_0_17, adc_0_18, adc_0_19" instead of "adc_2_16, adc_2_17, adc_2_18, adc_2_19"), 
    - hitting "Select >>," to bring them over to the "Selected Signals," then 
    - deleting any "Selected Signals" which have question marks in front of them (i.e. "??adc_2_16").

This needed doing for all ADC2 and ADC3 bus selectors fed into the RM1, RM2, PM1, JM1, and JM3 library blocks, with channels selected so they match the along AA chassis input for those cards from D0902810-v12.

The new top level model has been committed to userapps svn rev r34217.

[Eric, Daniel, Karmeng]

We transferred the OPO from LVEA to optics lab, uncovered the lids and everything looks good.

Touch the mirror mounts and mirrors, no failure except for M3, which swivels off the mount, only part of the glue holding the mirror on the mount.

FAMIS 27830 TCS Chiller top off

12/16/2025    Tony    30.7    100    30.8    10.2    125    10.4    Top of ball reading

J. Kissel, O. Patane

After having sorted issues with the (non-existent) binary IO (see LHO:88542 and LHO:88544), and Oli has performed all the "usual" controls updates after a 32CH DAC upgrade, all of the HAUX suspensions -- IM1, IM2, IM3, IM4 -- are now confirmed functional, damped, and aligned.

We've left their guardians them in the ALIGNED state.

That means all SUS in HAM2 are fully functional on the new merged sush12 computer / IO chassis and following the drawing D0902810-v12. See analog changes in LHO:88519 and software changes in LHO:88527.

J. Kissel

The issues we found with the IM's binary IO motivated me to update the MEDM screen interface to the system -- namely making it more like other HAM Single Stage Suspensions (HSSS) and the top masses of HAM X Double Suspensions (HPDS, HDDS, HTDS, HSDS) which clearly indicate that the HAM-A drivers they use have had their remote binary IO control / readbacks disabled.

At LHO the MEDM screens that call the interface are
    /opt/rtcds/userapps/release/sus/common/medm/haux/
        SUS_CUST_HAUX_MONITOR_OVERVIEW_all.adl
and
    /opt/rtcds/userapps/release/sus/common/medm/hsss
        SUS_CUST_HSSS_OVERVIEW.adl

which now *both* call the same BIO screen, which I've moved
    FROM
    /opt/rtcds/userapps/release/sus/common/medm/
        haux/SUS_CUST_HAUX_BIO_ALL.adl

    TO
        hsss/SUS_CUST_HAUX_BIO_ALL.adl 
then modified and committed the svn location change. See BEFORE and AFTER.

I then edited the following macros to change the SUSTYPE or sustype variables from "IM" or "im" to "HAUX" or "haux."

    /opt/rtcds/userapps/release/sus/common/medm/
        susim1_overview_macro.txt
        susim2_overview_macro.txt
        susim3_overview_macro.txt
        susim4_overview_macro.txt
        susimall_overview_macro.txt
These have *not* been committed to the svn as the macros also contain all of the ADC / DAC / AI / AA / front-end configurations that have diverged for suspensions at L1 and H1. 

J. Kissel, O. Patane,

Oli and I have moved on to recovering the SUS IMs post their migration from the h1sush2b computer into the newly merged h1sush12 computer / IO chassis system yesterday (see 88519 and 88527), but immediately noticed that the MEDM OVERVIEW screen reported that the test/coil enable bits were in apparently non-functional state (see "before" OVERVIEW and BIO screens).

Thinking through it, and remembering that the IM's binary IO switching had been rendered "defunct" back in July 2022 during their upgrade of HAM-A coil drivers (LHO:64171 manifesting ECRs E2200307, E2400048, and E2500295), we release that the digital representations of the sush2b BIO card read/write had never been removed from the h1susim model. Prior to the sush2b + sush2a = sush12 merge, talking to the sush2b card didn't matter. 

But now that this model is running on the merged chassis, the digital representation of talking to binary card 0 and card 1 means that that both the h1susmc1 and h1susim models are talking to the same BIO card (card 0 and card 1, the lower an upper halves of the physical BIO0 card) in the sush12 chassis! No bueno.

This double comms is confirmed by comparing the top level and BINARY DECODE block of h1susmc1 (userapps svn rev r33947) model's Binary IO communications to the "before" communications within the h1susim model top level (userapps rev r33974).

As such, I've modified the top level of the h1susim model to remove all digital representation of the cards, and sending 85 = 01010101 ("the Test/Coil switch is set to COIL enabling drive from the DAC, and the LP is ON" for each of the 4x suspensions) into the EPICs readback to indicate / match reality, and terminating the top level control request. See top level of the model now committed as rev r34204.

A 5 dB attenuator was added at the input of the RF doubler for the JAC 43 MHz generation. This brought the input level to a nominal 10 dBm.