TITLE: 08/22 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: Keita investigated the beams out on ISCT1, he relocked green after he was finished, they still look good (~1.15 for ALS-Y, and ~0.75 for ALS-X). I'm leaving them unlocked.
LOG:

Oli, Erik, Dave

Oli found that tconvert was complaining of an expired /ligo/data/tcleaps/tcleaps.txt file. The "valid through" line in this file is the UNIX time for 07aug2026, which is when we think this warning started.

We have extended the "valid through" time by 10 years, it will expire August 2036.

TITLE: 08/21 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: Ryan C
SHIFT SUMMARY: Quiet day for the most part with a Beckhoff reboot, more alignment work with ALS troubleshooting, various PEM activities, and a couple of tour groups. The JAC temperature servo still appears to be settling out slowly since the reboot, causing the JAC to unlock periodically (trend attached). The LVEA remains Laser HAZARD.
LOG:

SQZ slow controls SDF became unresponsive late this morning. I tried a restart of this model on h1ecatmon0

> rtcds restart h1syscssqzsdf

but it did not read the monitor request file and ran with zeros in all the channel counts.

After verifying the monitor.req and safe.snap files existed and looked ok, I did a slow stop/start of this model with about 1 minute inbetween. This time it read the monitor file and is monitoring 1340 chans.

I've completed the upgrade of DAQ stat. New features ported from the old system are:

 - DC broadcast list check-sums must be identical

 - DC FE network port bandwidth must match within a tolerance

 - FWs disk usage is displayed, warnings issued to too large or too small

The MEDM was getting too tall to fit a 2k monitor, so the framewriter section was moved to the right.

Remaining task is to add the new channels to the DAQ next week.

Daniel tried to rebooted Beckhoff PC remotely, but it didn't come back so he rebooted it in MSR.

After that things came back mostly, there were two major exceptions:

1. JAC WFS whitening/dewhitening mismatch.

WFS whitening was off for two stages we use but the anti-whitening was on. WFS was at first turned on by the guardian when we tried to lock JAC and it totally misaligned it. We had to manually locked JAC, noticed that the alignment was off, cleared WFS history both in WFS feedback filters as well as JM1 lock filters, fixed the whitening/dewhitening mismatch by pressing "ON" buttons for two whitening stages, and after that it started working OK.

2. JAC got cooler, temperature servo overheats at first, and we're only getting 15 minutes lock stretches for now.

It took about 20 minutes for the Beckhoff to come back because the first reboot attempt didn't work (1st attachment). Thermistor 1 temperature dropped by about 0.05 degC as the temperature servo wasn't doing anything (2nd attachment, it looks like a sudden change but it's not, it's just that the Beckhoff EPICS numbers were frozen before that). Temperature servo started heating it hard as soon as it came back, overshot and tried to reduce heating, but it's still heating harder than it used to.  Because of that, JAC lock PZT voltage quickly goes to zero after relocking. We'll have to wait.

TITLE: 08/21 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: 1mph Gusts, 0mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.10 μm/s 
QUICK SUMMARY: More alignment work expected today including attempting to fix clipping in the POP path. Beckhoff restart also expected this morning; the computer looks to have lasted the night. The X arm is currently locked in green with good IR flashes.

TITLE: 08/21 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 at 2W

Ryan C informed me of the Beckhoff issue that will require an early morning computer restart (alog 91611). In the meantime, comissioners Elenna, Keita and Louis were working on alignment, specifically trying to solve a clipping issue related to PR2 in PRMI acquisition. 

During this, Elenna and Louis were putting IFO in single bounce IR with green arms on X to guage the alignment at the PRC. Then, they were going to pico. They'll continue tomorrow. Details in alog 91632

LOG:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        

[Elenna, Louis, + guidance from Sheila, Jenne, Keita, Camilla]

To investigate the POP clipping in 91549 we settled on a plan to pico in HAM3 while watching the POP pds and the ALS COMM beatnote. To do this we locked the x-arm in green and misaligned the y-arm. To get IR in HAM1 and on ISCT1 we set up single bounce using ITMX at 10W. 

We first had to adjust PM1 to get it centered on POP-X. This was done while locked on MICH dark. It took a while but we eventually got close enough for the POP-X centering to work. Once it did we offloaded the new positions onto the sliders. We rastered PM1 (pit, yaw) to demonstrate that we are hitting the maximum possible power on LSC-POP at the current alignment. We are getting predominantly 2f oscillations in POP-X but 1f in LSC-POP in both PIT and YAW, indicating that the beam is not completely well-centered on the LSC POP diode with the current upstream input alignment.

Once we had a reasonable beam on the POP pds and a reasonable COMM beatnote, we started pico's in the HAM3 POP path. We moved what felt like large distances in X without seeing any change in the POP pds or the COMM beatnote. We tried a bit in Y too but didn't go nearly as far. This was towards the end of the day so we reverted the pico positions (as much as we can trust them) and paused for the evening. We plan to continue pico'ing to better understand the clipping situation in the POP path.

Summary:

• Good news is that ALSY WFSA demod is working as far as fast channels go.
• Bad news is that something is broken about LO and RF level monitors.
• Another bad news is that Daniel found that Beckhoff PC needs rebooting very soon. We asked him to do that tomorrow.

Somewhat longer story:

Yesterday LO power for two out of four channels for ALSY WFSA demod (H1:ALS-Y_WFS_A_DEMOD_LOMONCHANNEL_3 and H1:ALS-Y_WFS_A_DEMOD_LOMONCHANNEL_4) were found missing. Attached trend shows that these channels were lost on July/16 at around 7:16AM local time, shortly after the power came back from the power glitch.

Fil and Daniel went to the end station and swap the chassis but only one channel was fixed, H1:ALS-Y_WFS_A_DEMOD_LOMONCHANNEL_3 was still bad.

Today I injected RF signal to the RF in of WFSA channel 3 and confirmed that the demod signal correctly appeared in both in H1:ALS-Y_WFS_A_I3_INMON and H1:ALS-Y_WFS_A_Q3_INMON. (For comparison I also injected into ch1 and saw the same response.)

I decided to leave it alone until Tuesday, but Daniel found that Beckhoff computer is in dire need for reboot. He said it MIGHT last for the night, it might not, and when the PC crashes it will affect many things but not PSL, and the wave plate rotator will be affected but will not move on its own after a crash. Since Louis and Elenna were working on pico-ing, we decided to try our luck.

Before going home I changed the laser power back to 2W. At this point the PC still seems to be running.

On Tuesday, August 18, and over the following two days, I installed the DAS fiber on the vacuum chamber and along sections of the LVEA floor with the help and guidance of Robert.

The DAS interrogator system is located at the H1 TCS Chiller and is connected to the LVEA through the mechanical cable tray. From there, the fiber is routed across the piping bridge and down beneath the vacuum chamber to the seismometer (SEI GND STS). At the seismometer location, we created a fiber loop to enable a direct comparison between the DAS and seismometer recordings.

The main objective is to compare the coherence between the DAS and seismometer measurements and to investigate the extent to which the intrinsic noise of the DAS system limits its performance in recording seismic and vibration signals.

From the seismometer, the fiber was routed back and attached to the vacuum chamber, with approximately five to six turns around the chamber. The fiber was then routed back to the seismometer, where an additional loop was created around the instrument. 

I also performed several tapping tests to georeference the DAS channels and identify the different sections of the fiber. Based on these tests, we were able to distinguish the individual fiber sections and associate them with their corresponding physical locations.

Photos of the installation are attached.

Jonathan, Dave:

daqstat was the last service to move off of h1daqscript0 (others were Dolphin network manager and daq_run_number_server). We powered this machine down at 16:30 today. I have temporarily greened the EDC by adding h1daqscript0's epics_load_mon channels to edc_green_ioc.

The LHO DAQ has three frame-writers. Two (FW0 and FW1) write to LDAS and have large disk arrays, the third (FW2) runs with a local disk and is used as a "tie breaker" if the two primary machines disagree with each other.

There are now 5 permutations of agreement between the 3 frame-writers:

All agree (0=1=2)

All disagree (0!=1!=2)

One disagrees with the other two ((0=1)!=2) ((0=2)!=1) and ((1=2)!=0)

Instead of a simple red/green LED indicator on the MEDM, we now have borders around each monitor which are red/green depending upon the agreement.

TITLE: 08/20 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: Ibrahim
SHIFT SUMMARY: Multiple optics lab dust alarms throughout the day, corner alignment, we did not get to PRMI or DRMI as there was a ALS slow controls issue unlocking XARM. The main Beckhoff computer seems to be having connections issues, a restart is required to fix this, and it will be done tomorrow.
LOG:                                                              

• Started by aligning and locking the green arms, then Camilla and Elenna went out to improve the diff beatnote (-18 -> -11)
• 18:11 -19:22 UTC EQ mode from a 6.7 from Peru
• 19:37 UTC Automated phone call from Hanford regarding take cover drill today
  • Another call a few minutes later to terminate it
• ~20:00UTC manual initial alignment started
•  I was able to increase the power on ALSX by ~10/15%, up to ~0.75 while rechecking alignment after the earthquake

(Travis, Gerardo)
The ion pump for HAM1 was incorporated to the HAM volume yesterday, and today the SS-500 pump cart was isolated from the chamber (turbo pump and SS-500 remain on), and as expected the pressure went up and now we are waiting for the ion pump to take over and maintain the vacuum pressure for HAM1.  We will be monitoring the progress of the ion pump.

(Travis, Gerardo)
This morning we checked HAM7 annulus system pumpdown and the aux-cart displayed 2.6X10^-05 Torr, good progress so it appears to be doing good.  We disconnected the SS-500 cart from HAM6 turbo and connected it to HAM7.  We checked all ports were "nominal", detached the active purge hose and no blowdown was done, since we had the relay tube valve (RV-2) open, took advantage of this and we let the purge air purge HAM7 overnight out RV-2.  After closing RV-2 we started the pumpdown of HAM7.  The purge valve (all metal valve) and the roughing valve at the turbo assembly were closed at 3.0X10^-05 Torr.
Attached is a plot of the pumpdown thus far.

Miranda, Dave:

Over the past week we have documented the LHO PEM accelerometers and produced an as-built  wiring drawing

This was in response to a possible misreading of accelerometer(s) with the wrong channel names.

We found three accelerometers with incorrect names, which date back to pre-O4, so I'm tagging DETCHAR.

We fixed this at 16:00 Thursday 13th August 2026 PDT by remapping the BNC connections on the front panel of APC1. The cable going to port12 was moved to port13, that going to port13 was moved to port14 and that going to port14 was moved to port12.

We tap-tested the EBAY_FLOOR accelerometer at 16:10 and this showed up on H1:PEM-CS_ACC_EBAY_FLOOR_Z_DQ