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Reports until 15:20, Thursday 20 August 2026
H1 CDS
david.barker@LIGO.ORG - posted 15:20, Thursday 20 August 2026 (91615)
New DAQSTAT installed

Jonathan, Dave:

A new DAQSTAT system has been installed on H1 production. Following the recent DAQ upgrades it was found to be easier to rewrite the code rather than patch the original. The code has been made more portable for possible install at other locations.

Details:

code generated by Claude AI (Opus 4)

IOC runs in a deb13 container on the service-host cluster

Code generates MEDM and DAQ-INI files in the directory /opt/rtcds/services/daqstat_ioc/

Code is configured by the DAQSTAT.yaml file in the cds/h1/scripts directory

Code preserves state between restarts using a JSON file in the services directory

 

Images attached to this report
H1 General
ryan.crouch@LIGO.ORG - posted 14:37, Thursday 20 August 2026 (91614)
OPS Thursday Day shift summary

TITLE: 08/20 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, 2mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.08 μm/s 
QUICK SUMMARY:

H1 ISC
elenna.capote@LIGO.ORG - posted 00:41, Thursday 20 August 2026 - last comment - 02:14, Thursday 20 August 2026(91610)
Both arms locked on green!!

[Keita, Louis, Jenne, Elenna, others in CR]

We have locked both arms on green! Proof.

Jenne started running baffle PD scripts for TMSX and ITMX with Keita. There is some issue with ITMX baffle script, so Keita and Jenne walked through the process by hand (hopefully one of them will describe). Jenne was able to lock the green arms after aligning ETMX by hand. We don't think the slow controls are working, so we couldn't move beyond the "locking" state in the guardian.

While Louis and Jenne were running the y arm baffle scripts, there was a power glitch that tripped both end station HEPIs. We stood down while Ryan and Huyen went to reset them.

Louis had a hard time with the ITMY baffle PD script. I was able to move ITMY a large amount to find the March 5 2026 setting Jenne found here. This allowed Louis to finally find the beam on the baffle PDs. After a few iterations by hand and with the script, we settled on a setting that moved ITMY by 110 urad in pitch and 56 urad in yaw.

We could not see green flashes at ISCT1 from the y arm, because the beamsplitter is now very misaligned between the two ITMs due to the large ITMY move. First, I misaligned the Y arm and checked for the red beam on ISCT1 refl camera. I had to move IM4 to find it there. Then, Louis and I tried to move the beamsplitter around. We found that by putting ITMY back to its slider setting before the baffle PD script was run, we could move ITMY a bit towards the correct direction and follow with the beamsplitter. We also had to touch up SR2 to keep the beam on the AS AIR camera and roughly centered on AS_C.

Images attached to this report
Comments related to this report
elenna.capote@LIGO.ORG - 02:01, Thursday 20 August 2026 (91612)

We completed an initial alignment. Oddly, IM4 and PR2 didn't need to be moved at all for input alignment, depsite the fact that we put IMs1-3 in their desired locations for ISS QPD and IM4 trans. However, I did move IM4 earlier to find the red retroreflection from ITMX during our green alignment work, so maybe this makes sense after all.

We have locked PRMI again, and the OLGs look good. This includes BS feedback to M3! Screenshot of OLGs. Camera looks terrible, but no BS or PRM touch up helped. We are using oplev damping on the beamsplitter and then disengaging it as soon as PRMI locks.

We are now trying to lock DRMI with little luck despite the good flashes.

Images attached to this comment
elenna.capote@LIGO.ORG - 02:14, Thursday 20 August 2026 (91613)

After failing to lock DRMI for a bit, I decided to check the SRY olg. I noticed that there was quite a bit of gain peaking in the loop, so I turned off the 30 Hz low pass. This made the SRY olg much better, but then I learned that maybe this has no effect because the ISC DRMI guardian doesn't engage this filter.

The screenshot below shows the blue reference trace in the template, the green trace is the OLG I measured with SRCL FM8 LP30 on, the ref trace is with FM8 off.

Images attached to this comment
LHO VE (VE)
gerardo.moreno@LIGO.ORG - posted 00:15, Thursday 20 August 2026 (91608)
GV6 and GV8 Are Open

(Travis, Gerardo)
Both valves were opened today, and both of them were set to 55 psi to keep them open, both started going up around 45 psi.  No issues noted, aside from the usual hissing at GV6 thru the side opening.  Gate annulus was dumped into the ion pump without problems. Turbo pumps were isolated before opening valves, OMC tube, YBM and XBM, all turbo pumps remain on and they will remain on until pressure normalize/settles at the corner.  I isolated HAM6 turbo pump yesterday afternoon, and today I shut it off, aux-cart (SS-500) remains connected and on.
Note to all, HAM6-HAM5-HAM7 area remains a "clean" area, relay tube still out, installation is TBD.

Images attached to this report
LHO General
thomas.shaffer@LIGO.ORG - posted 19:51, Wednesday 19 August 2026 (91604)
Ops Day Shift End

TITLE: 08/19 Day Shift: 1430-2000 UTC (0730-1300 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: Oli
SHIFT SUMMARY: GV6 & 8 were opened this morning, so we now have a full IFO to commission. Commissioners have been hard at work aligning to the arms. 
LOG:                                                                                                                                                                                         

Start Time System Name Location Lazer_Haz Task Time End
16:32 SEI Jim, Huyen LVEA - H2 y CRS wrapping 17:56
16:32 DAS Reinhardt LVEA y Fiber checks 19:55
16:39 FAC Randy LVEA y Craning scissor lift and 3IFO container 18:00
17:09 VAC Gerardo LVEA y Isolating turbos then opening GV6 & 8 18:05
17:16 JAC Jennie LVEA Y JAC table meas 18:03
17:16 DAS Jenne LVEA y Checking in with Reinhardt 17:30
17:29 PEM Robert, Miranda LVEA y Check on acc. name 17:36
18:03 SQZ Camilla, Ryan S LVEA y HAM7 area cleanup 19:19
18:19 ISC Jennie Opt Lab n Plug in power meter 18:45
19:08 SAF Jackie Ends n Taking pictures of first aid kits 20:08
19:20 ISC Camilla Opt Lab n Clean up 19:29
H1 ISC (SUS)
elenna.capote@LIGO.ORG - posted 19:10, Wednesday 19 August 2026 (91602)
Successful commission of BS M3 feedback for MICH

Louis and I immediately started where we left off yesterday with BS M3 commissioning. Louis copied over the LLO filter design that sets up the BS feedback with a 7 Hz crossover between M2 and M3, 82200 (thanks LLO for doing the heavy lifting here!).

I copied these filters into my matlab model so we could confirm we understand what it is doing. This plot shows the modeled feedback with the locking and drivealign filters applied. The LLO design is applied to M2 and M3, such that the crossover is roughly 7 Hz as expected. I applied our current M1 offloading scheme, and the M1/M2 crossover is still 30 mHz.

This looks good to us, so we proceeded to copy over the filters to the BS sus banks. I first locked MICH dark using the old feedback design without the lowpass filters so we had much more phase. This provides a reference for us to make sure we do the switchover correctly.

Louis and I engaged the correct filters in ISCINF M3 L, M3 lock L, M3 drivealign L2L and M2 lock L. Here is a screenshot of the old M2 filter design, and here is a screenshot of the settings we used to test the new feedback. I want to note that one difference is I found that we need a gain of -1 overall in BS M3 drivealign to get the phase correct.

I did touch up the MICH alignment before locking, since the arm team is working on aligning the arms now that gate valves are open (spoiler alert).

We successfully locked MICH dark, no issues! I measured the MICH olg again, and saw that we were almost exactly where we wanted to be in the gain, and the phase is a little different but not drastically so.

Masayuki noted in a previous alog that the MICH gain is a bit low, it would be better to have a 10 Hz UGF. Therefore, I bumped up the gain by a factor of 3 and remeasured. Looks good! This plot compares all three MICH dark olgs.

Louis has updated the ALIGN_IFO guardian with these new settings and is working through ISC_DRMI. In addition to the filters in the BS sus, we are updated the MICH dark and MICH bright gains to be 3x higher (so plus/minus 7200 instead of 2400).

As a note, ALIGN IFO does not use M1 feedback, we expect to test this when we lock PRMI/DRMI. However, I don't predict any issues, as the crossover should still be the same.

I have accepted new settings in the SDF as well, screenshot.

Below are the foton strings that we copied over:

BS_M2_LOCK_L

FM1: zpk([-4.398229715026552+i*5.654866777052986;-4.398229715026552-i*5.654866777052986], [-344.8589087698574+i*562.4185982606715;-344.8589087698574-i*562.4185982606715; -2513.274122871833],21314144.89497595)

FM2: zpk([0+i*754.0107241782374;0-i*754.0107241782374], [-114.2660735869546+i*205.9572881820654;-114.2660735869546-i*205.9572881820654], 0.09757621338967941)

FM4: zpk([],[-50.26548245743591],50.2654824574367)

BS_M3_DRIVEALIGN

FM1: zpk([],[],298.5382618917961)

FM2: zpk([0],[-50.26548245743591],1.003192)

FM3: zpk([0+i*1.232546515546514;0-i*1.232546515546514;0+i*2.235392999096904;0-i*2.235392999096904], [-0.1284339970099986+i*2.497529352797497;-0.1284339970099986-i*2.497529352797497; -1.722920509773179+i*2.801700651589354;-1.722920509773179-i*2.801700651589354], 0.9928357135551715)

FM10: zpk([0+i*2021.046153045786;0-i*2021.046153045786;0+i*4405.443648178848;0-i*4405.443648178848], [-457.9243327239894+i*601.6182012226579;-457.9243327239894-i*601.6182012226579; -132.3004333168722-i*1248.734723957288;-132.300433316874+i*1248.734723957288], 0.01013394010636035)

Images attached to this report
H1 AOS
khanh.vu@LIGO.ORG - posted 17:48, Wednesday 19 August 2026 (91598)
New WFS Balancing Measurement

As promised, this morning I took a new measurement of the JAC reflected beam on wavefront sensors A and B. This time, we unlocked the JAC, which provided a cleaner beam for centering in both pitch and yaw. The results were much better, with the relative differences between segments reduced to below about 10%.

As a sanity check, we compared the measured and calculated G1/G4 ratios for WFS A and WFS B, as shown in the attached table. For WFS A, the discrepancy is about 10%, while for WFS B, it is only about 2%. We think the remaining error may come from beam clipping when we attempted to recenter the beam between the two halves, the approximately 1 mm gap between the quadrants, or pitch-yaw cross-coupling.

Overall, this measurement gives us an estimate of the uncertainty associated with this technique for measuring the relative segment gains.

Images attached to this report
H1 ISC
elenna.capote@LIGO.ORG - posted 16:59, Wednesday 19 August 2026 - last comment - 19:57, Wednesday 19 August 2026(91593)
PRMI locking, attempt to commission BS M3

Long day, short alog

We continued to try to lock PRMI today. After consulting with Sheila, we moved IMs1-3 back to the alignment they had during the arm peek last week. Ryan S has noted the osem values for each alignment, so we can switch back and forth between these two configurations. Then, Louis and I reverted IM4, PR2, PRM, SRM, SR2, BS to their alignments during a DRMI lock last week. I also moved SR3 to its current alignment (TCS team had moved it back to old O4 alignment for HWS work).

This alignment was very bad for flashes, so I iterated between initial alignment work on PRX and MICH, and running a PRMI lock. We found that it was very difficult to lock PRMI, both because the alignment was poor and the beamsplitter was moving a lot. Once we turned back on BS oplev damping, PRMI locking was more frequent due to less BS motion, allowing us to better touch up the alignment. However, there was then a large 6 Hz oscillation. After checking many things, it turns out the oplev damping is causing this oscillation, both PRCL and MICH are stable. So, we need oplev damping to lock but we can't keep it on or we will unlock.

After talking with Sheila again, I moved to try commissioning the BS M3 feedback as a way to help this problem. Louis and I tried measuring the beamsplitter plant with the offloaded feedback to M2 and M1 and then M3 and M1. We found that we needed about a gain of -300 on M3 to replicate the M2 plant. However, we could not lock MICH dark with this feedback.

We tried many different things after this which I won't detail, but Keita and I performed a different type of measurement that confirmed the work Louis and I did earlier was correct. When we locked again, we saw that the issue is that the DAC rails. Looking at the master outs on M3, the saturation occurs below 10 Hz. I see that we should replicate the LLO feedback that is distributed between M2 and M3 with a crossover of 7 Hz. See 82200. I will pick this up tomorrow.

Editing to add spectrum of BS M3 master out with length feedback applied and the appropriate gains. I put a horizontal line roughly at 134e6 DAC counts, which is where we expect the saturation to occur on our 28 bit DACs. A crossover of 7 Hz as LLO has would work well. Louis is copying their filters over now.

Images attached to this report
Comments related to this report
ryan.short@LIGO.ORG - 19:57, Wednesday 19 August 2026 (91605)ISC

The two configurations Elenna notes for the IM alignments are as follows (all values in terms of suspension OSEMs):

  Pre-EQ (8/10) Arm peek (8/11)
IM1 P 2865 P 2879
Y -1027 Y -1025
IM2 P 161 P 43
Y 421 Y 412
IM3 P 269 P 259
Y -1216 Y -1215

As of 1pm local time today (August 19th), we are in the pre-EQ (8/10) IM configuration.

LHO General
thomas.shaffer@LIGO.ORG - posted 14:33, Wednesday 19 August 2026 - last comment - 21:17, Wednesday 19 August 2026(91595)
Ops Day Shift Start

TITLE: 08/19 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: 0.07 μm/s 
QUICK SUMMARY: Dust alarms in the PSL overnight, but they quickly dissapated. There was a verbal alarm at 0828UTC "Check corner station HEPI pumps", I don't initially see any issues but I'll continue to investigate.

Plan today is continued corner station commissioning unless we get the arms opened.

Comments related to this report
thomas.shaffer@LIGO.ORG - 14:55, Wednesday 19 August 2026 (91596)SEI

Sure enough there was a brief pressure dip in the CS HEPI pump pressures that it immediately recovered from. The 4 pumps and the supply and return all see it.

Images attached to this comment
thomas.shaffer@LIGO.ORG - 16:55, Wednesday 19 August 2026 (91599)

Looking into this a bit further, pump 4 sees the largest pressure change. Local IPS sensors on HAM3 see this change, but Jim said that their locationmon channels did not see it.

Images attached to this comment
patrick.thomas@LIGO.ORG - 21:17, Wednesday 19 August 2026 (91606)
Looking at the plots, it appears that the drive signal sent from the PLC to the VFD increases in response to the drop in pressure, so would indicate a response rather than a cause.
LHO General
ibrahim.abouelfettouh@LIGO.ORG - posted 02:15, Wednesday 19 August 2026 (91594)
OPS Eve Shift Summary

TITLE: 08/19 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:

IFO is in IDLE with IMC Locked and Power at 2W

Evening was spent trying to comisson BBSS M3 stage as a way to aid with alignment. Keita, Louis and Elenna have some next steps to try tomorow. See alog 91593.

After they were finished and per Jennie's instructions I changed the JAC Heater POWER_SET from 1.465 to 3. Then, I informed Huyen that Seismic overnight tests can begin.

LOG:

Start Time System Name Location Lazer_Haz Task Time End
14:54 FAC Kim EX - Technical cleaning 16:21
15:01 FAC Eric Outbldgs - AHU checks 16:47
15:52 PEM Robert LVEA - Looking at fiber locations 17:33
16:01 VAC Travis LVEA - Moving pump from HAM1 to HAM6 16:30
16:32 FAC Kim LVEA - Technical cleaning 17:36
16:34 PSL Jason PSL Y Parts search 16:50
16:41 SEI Jim CER - HAM3 ISI measurement 18:24
16:48 FAC Chris LVEA - Safety checks 17:37
16:53 TCS TJ, Camilla LVEA Y Checking HWS and CO2 tables 19:46
17:33 PEM Robert, Reinhardt MER/LVEA - Running DAS fibers (Robert out at 23:52 UTC) 00:29
17:56 FAC Kim FCES - Technical cleaning 18:55
18:08 TCS Jennie LVEA Y Looking for RF source 18:19
18:11 VAC Travis, Gerardo LVEA - Valve in HAM6 turbopump 18:24
18:26 TCS Fil LVEA - Troubleshooting CO2 laser 19:46
18:47 AOS Betsy LVEA - Checks in W-bay 19:08
19:34 FAC Randy LVEA - Pulling 3IFO ISI container lid 22:30
19:48 SUS Jason OptLab - Checking oplev lasers 21:39
20:08 VAC Gerardo LVEA - Starting leak detector on BSC8 23:31
20:14 AOS Betsy LVEA - W-bay cleanroom move 21:25
20:19 VAC Travis LVEA - Leak checking and cleanroom move 23:25
20:29 AOS TJ LVEA - W-bay cleanroom move 21:09
20:56 SEI Shoshana, Huyen, Jim LVEA - H2 PSL - CRS cleanup 22:37
21:25 TCS Camilla, TJ LVEA Y CO2Y troubleshooting 22:48
22:11 EE Jackie MER - Replacing BHD chassis 23:12
23:29 TCS Camilla OptLab - Tidying up 23:54
00:10 PEM Robert EX Y Finding glasses 00:23
01:54 VAC Gerardo LVEA Y HAM6 Turbopump valve 02:08
H1 DAQ
jonathan.hanks@LIGO.ORG - posted 23:38, Tuesday 18 August 2026 (91591)
WP 13504 investigating higher rate of transport issues

Since enabling irqbalance on dc0 we seen less CRC errors (only around restart times for the last few days).

Today we enabled irqbalance on dc1.  Unlick on dc0 there was a small (but visible) dip in the average cpu use.

We will continue to watch this.

H1 IOO (OpsInfo)
jennifer.wright@LIGO.ORG - posted 23:01, Tuesday 18 August 2026 - last comment - 18:41, Wednesday 19 August 2026(91587)
Increased JAC heater gain

JAC Heater ran out of range this afternoon and the JAC unlocked. We started this lock stretch (first x cursor) already at a pretty high PZT offset so I might add a upper limit to how high a voltage we should lock at.

I have increased the gain magnitude in the heater control servo from -0.1 to -0.15 to try and stop this happening again before this evening when we will increase the power set value from 1.5 W to 3W to give us more headroom above ambient temperature for the servo.

Images attached to this report
Comments related to this report
jennifer.wright@LIGO.ORG - 16:35, Wednesday 19 August 2026 (91597)

Here is a plot including the control signal. With the lockloss at the first cursor and the gain change at the second.

The JAC locked again at a much lower voltage and so stayed locked until the planned increase in the set power to 3W last night caused some locklosses.

The system looks underdamped from this step response so I will test some changes to the controller over the weekend.

Images attached to this comment
jennifer.wright@LIGO.ORG - 18:41, Wednesday 19 August 2026 (91603)

I aaded an upper limit to the SCANNING state in the JAC_LOCK guardian it will only scan up to 300V instead of 330V, this should prevent the cavity locking near the upper limit of the PZT.

Loaded and committed the guardian.

LHO VE (VE)
gerardo.moreno@LIGO.ORG - posted 18:01, Friday 14 August 2026 - last comment - 01:45, Wednesday 19 August 2026(91555)
BSC8 PT-180 Gauge Removed and Replaced

(Travis, Gerardo)
We removed the old gauge a BCG-450 and installed a new one a BPG-552.  Since the gauge at this location does not play role with relays and such, the old pigtail did just fine, provided the power to the new gauge.  The new gauge is powered on and connected to the same EtherCAT cable as the one that that we removed.  Dead volume of this assembly is getting pumped down with a small can turbo pump and an aux-cart, and a very long flex hose, and probably will continue to pump over the weekend.
No issues were encountered while replacing the gauge.

Images attached to this report
Comments related to this report
gerardo.moreno@LIGO.ORG - 16:43, Monday 17 August 2026 (91571)VE

(Travis, Gerardo)
Aux-cart and all other accessories have been removed from this gauge.
We need to leak check the conflat on this new gauge.

gerardo.moreno@LIGO.ORG - 01:45, Wednesday 19 August 2026 (91592)VE

(Travis, Gerardo)
Today we leak checked the 2 3/4" CF joint for the new gauge at PT-180.  The leak detector did not detect a leak above the background, we connected the leak detector at the XBM main turbo pump and we sprayed the joint with copious amounts of helium.  Helium background of 6.0X10-10 Torr*l/sec.

Images attached to this comment
Displaying reports 1-20 of 88957.Go to page 1 2 3 4 5 6 7 8 9 10 End