FAMIS 31128

The PMC HV supply was swapped 6 days ago (alog89349) which took the PMC down briefly. Afterwords, we did some slight PMC alignment and bumped up the pump current for PS4 to get slightly better PMC transmission. The PSL models were restarted on Friday due to timing errors (alog89413), which also briefly took things down, but everything came back without issue.

Mon Mar 09 10:16:12 2026 INFO: Fill completed in 16min 9secs

WP13077 Replace suspect first LIGO-DAC in h1sush12

Sheila, Marc, Erik, Dave:

We replaced the first LIGO-DAC in h1sush12's IO Chassis. Its ribbon cable and interface card were also replaced.

Replacement parts were removed from the DTS x7eetest1 system.

No DAQ restart was required.

Taking a look at some of the MC1 signals from over the weekend with Sheila and Jeff, we've decided to next swap the DAC card, card 0 on h1susmc1. The OSEMs are moving but not seeing a request in the MASTER_OUT. T3 noisemon seems to see it first.

TITLE: 03/09 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: 0.02 μm/s
    Secondary useism: 0.26 μm/s 
QUICK SUMMARY:

• IMC recovery will continue today, there will probably be some more investigation into MC1
• Hopefully we'll get to further locking to check the BS.
• HAM1 continues to pump down

The annulus ion pump for the Y-Beam manifold railed on Saturday around 9:00 PM local time.  However, the signal for the controller did an odd oscillation before railing, see attached plot.  Nothing noticed in the main vacuum volume signals (pressure rise), we will diagnose this system as soon as possible, we need to verify what the problem is, the ion pump body or the controller.

Sun Mar 08 10:18:18 2026 INFO: Fill completed in 18min 14secs

Sat Mar 07 10:18:00 2026 INFO: Fill completed in 17min 57secs

Erik, Dave:

I have built and installed Oli's first versions of the HAM6 SUS models: h1susom0, h1susobs, h1susam, h1susomcab, h1susom1ab, h1susom2ab and h1susom3ab.

Currently h1sush6 is running without Dolphin IPC and is not connected to the DAQ. Therefore to get this early running I edited the models and removed the remaining H1:LSC-TRIG_IFO_PCIE part from the om0, obs, am, om[123]ab models.

Only the iop model is in puppet, so I had to also do some hand editing of the rtsystab file to get the models to start.

I made a temporary edit to generate_cds_overview.py to add these models to the CDS Overview. To make space I simply stretched the window vertically. I'll reorder the lower section so the SUS column can take the full window height (also additional models will be added to h1sush5 and h1susb2h34).

Next week we will put all of this into puppet and add these models to the DAQ.

S. Muusse, T. Roocke

All chassis were put on the rack for the Y table and cables attached. All electronics were tested and working however, we have realised additional power supplies are required and some additional cables are required.

Power supply/ cables still required:

• 15V for flipper
• 12V for fan 
• 5V for visible
• Make cables for fans
• Make cables for flipper

A potential solution is to use pre designed 15V, 12V, 5V, regulator boards in another chassis which can be input to the table through the blank and power feedthroughs.  Alternatively there are some preexisting supply boxes for 12 and 15 V

TITLE: 03/07 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY: We ran into issues trying to lock the IMC after locking JAC and GREEN_ARMs, it seems to be from MC1 (T2 and T3 mostly). 
LOG:                                                                                                                                                                                                                                                                                                                                                                                        

16:37 EX sensor correction off as the BRS was ringing up from Randys' loading of the ergo lift.

17:18 Sheila unlocked the rotation stage and I turned up the power to 1W, Sheila then relocked it.

17:35 UTC I used the ALS nodes to run an alignment for GRREN_ARMs, ALSX locked after a few taps of ETMX but ALSY took more convincing

19:30 UTC I started to run TFs for MC1, then MC3 aand RyanS did MC2

23:10 UTC SUSHB13 crashed, possible from Marc's work in a close by rack

23:17 UTC ITMX, ITMY WDs tripped, SW, ISI ST1, ISI ST2, and HEPI

23:31 I remeasured MC1 P and confirmed that the Coil Driver swap was unsuccessful, the TF still looked the same. I also ran an undamped OSEM spectra before and after the swap.

All the h1susb13 models stopped with timing errors this afternoon, followed later by h1psl0's iop model. CER activity was ongoing around this time.

We tried a model restart on h1psl0, which did not work. We rebooted the machine and all started OK.

We tried a reboot of h1susb13, but it got stuck. We then hard-reset the computer via IPMI and all came back OK.

Following the recovery of h1iopsusb13 I untripped the BSC1 and BSC3 SWWDs (the SEI had tripped).

Daniel had a new h1ascimc model to install (no DAQ restart). We stopped h1ascimc, which caused a DAC error on h1iopasc0. So as before, we had to restart all the h1asc0 models to load a new h1ascimc.

Per WP13076 we replaced the coil driver for MC1 due to suspicion it was causing MC1 to jump.  The coil driver in question glitched on TOP3.  Referencing D0902810-v12, the chassis in question is U41 on SUS-C4, we exchanged it with a spare.

Old SN - S1001097, New SN - S1100194

Shelia will retest the signal chain to see if this solves the issue.

I was adjusting the alignment of MC1 pitch earlier, when the suspension had a large alignment shift that wasn't caused by a change in the requested drive to the DACs.  The attached screenshot shows my requested alignment shifts in opticalign, and the resulting change in the requested DAC counts on T2 + T3.  There is a sudden 420 urad jump in the osem readbacks from pitch, and a 133 urad jump in roll at the first time cursor.  The master outs only see a few cycles on oscillations, which probably is from the damping loops responding to the jump, but they settle to the same requested drive as before the jump.  The jump seems to be real as the IMC flashes disappeared at this time.  

(Travis S., Gerardo M.)
Pumpdown was started this morning, sorry no blowdown data.  By the time I remembered to take the reading there was no more pressure inside the chamber.  Travis connected all of the equipment while I wrestled with the viewport inspection.
Pumpdown was started without an issue.  We started with the scroll pump from the super sucker 500, the scroll pump of the SS500 cart brought the pressure down to 3.7x10-01 Torr, then we switched the cart to start pumping with the turbo pump/scroll pump.  We had one trip of the system, usually due to a time out, but it only took a restart of the turbo pump and the pumpdown to continue.
Unfortunately the pumpdown had to be stopped at 8:00 PM local time, with a pressure of 4.0x10^-05 Torr, at that pressure the set points had not activated on the SS500 cart controller, the set points are hard set and can't be modified from the SS500 controller screen.
Pumpdown will be restarted tomorrow morning.

Note, on the attachment, regarding the screens, no set points for channel 1.

The HAM1 +Y door was installed today.  Installation went smoothly and the O-ring cooperated by staying in place today.  I will note that torquing the door bolts is becoming more of an issue due to wrench access being increasingly limited near the 5-way cross/feedthru areas now that all the in-air cables have been attached.

The HAM1/HAM2 annulus system is being pumped by 2 turbos/aux carts on the -Y side of the chambers.  The mysterious ~order-of-magnitude pressure readout difference at the two carts on the shared annulus system is again present, as was noted the last time this annulus system was pumped down.  Not an issue per se, just some vacuum phenomena that leaves us scratching our heads. 

Now that HAM7 is at sufficient pressure (6.4E-7 Torr as of this post) we helium leak checked the two re-installed 12" CF blanks removed for table locking and the entire relay tube assembly which had been removed for the viewport adapter on HAM5.

The Helium background was unstable, so we turned on the HAM7 cleanroom (on 2/18 afternoon) to help flush the area of helium overnight.

Today the background stabilized around 1.5E-10 Torr-l/s, so we were able to continue leak checking. No significant helium signal observed above the leak detector background which hovered between 1.5&2E-10 Torr-l/s during leak checking. 

HAM7 continues to pump down with the turbopump, next steps are chamber RGA scans.