Jennie W, Ryan S, Sheila D

We changed the calibrated JAC trans power readout to be the front-end channel H1:JAC-TRANS_A_LF_OUTPUT. This is now the channel displayed on the OPS_OVERVIEW_CUSTOM screen labelled as 'IMC INPUT POWER'.

The calibration filter for 'H1:JAC-TRANS_A_LF' is in FM10 labelled W_in_HAM2.

This was previously set as the Beckhoff channel H1:JAC-TRANS_A_DC_POWERMON but this is too noisy and was also not calibrated correctly as it displays in mW and was on the ops screen as W.

I have changed the calibration for this channel so it is actual mW leaking out of the JAC towards JACT_BS1 beamsplitter, which reflects approximately 1% (alog #89251) of light that hits it towards the JAC-TRANS PD (see image).

After checking the calibration measurements we took in chamber, I have realised that the amount of power we get out of the JAC curved mirror (the beam of which goes to the JAC TRANS after reflecting off a laser window) is too high to match the input power we inferred. Looking at the power budget Masayuki and I took at CIT (see elog #863). This predicts a transmission through the curved mirror of 7.5e-5 and from our calibration measurements (alog #89251) we saw (2.7e-3W/1W) = 2.7e-3. The other measurements we took in that entry (BS1 reflectivity ~ 1%, JAC throughput ~ 96mW/115mW = 83 %) don't seem unrealistic.

I can use instead the 7.5e-5 transmission of the curved mirror to calculate that the HAM 2 input power for a certain value of W on the JAC-TRANS_A_LD PD is ~ 1.11e6.

As JAC-TRANS_A_LF has some high frequency noise multiplying by this large number causes it to show high values when there is no light on it. Therefore I propose adding another filter bank to the model where I can low-pass this noise so the display of the HAM2 input power makes sense.

Jenne has turned off FM10 in the JAC TRANS A LF filter bank (see image of the filter banmk with the filter still on here) so the value on the screen looks close to zero for the moment. See Jenne's alog #89823.

Folks in the control room have continued to note that the "IMC Input Power" on the ops overview screen didn't make sense, and was causing confusion (eg, how do we have "700" Watts into the IMC, when there are zero Watts coming from the PSL).

Jennie let me know that the channel that's used is not yet conditioned and calibrated, so it was amplifying noise.  

I set the offset in H1:JAC-TRANS_A_LF, and also turned off the giant gain in the "W_into_HAM2" filter FM10, so now it at least looks like the output is fluctuating a small amount around zero, and should no longer be confusing on the overview screen.

I've saved the offset and filter state in SDF. 

Per WP13110 we have upgraded the IO chassis listed below.
This link contains the asbuilt for all of the H1 IO Chassis: https://dcc.ligo.org/LIGO-D1301004
This link contains the ECR for the IO Chassis sync cable upgrade: https://dcc.ligo.org/LIGO-E2600069

This link is to the work in progress spreadsheet LHO Front Ends Upgrade Status

Corner:
SUSB2H34 has upgraded firmware and sync
SUSAUXB2H34 has upgraded firmware and sync
SEIH7 has upgraded firmware and sync
OMC0 has upgraded firmware and sync
OAF0 has upgraded firmware and sync
ASC0 has upgraded firmware and sync
LSC0 has upgraded firmware and sync

We started the venting process for the corner today, including the FCB1 section of the filter cavity attached to BSC3

GVs Closed:

GV2, GV5 (GV7 remains soft closed until repairs are done on the piston cylinder), RV1, FC1, 2, 4, 5.

Dry air dewpoint at vent port = -40.3C

We followed the venting procedure E2300169, until the small burp of dry air into the corner volume, during this "burp" we noticed a small pressure increase at PT114 (CP1 gauge on beamtube side of GV5). There was a clear pressure step from 2.02E-9 to 2.04E-9 Torr at the same time as the dry air burp, see attachment.

We waited for ~15 minutes and repeated the air burp into the corner, again we saw another pressure increase at PT114, though the pressure gauge on the opposite side of CP1 PT124 showed a small decrease at the same time as the pressure increases. 

We paused the vent to investigate, PT120, PT114 and PT124 are all pirani/CC gauge pairs and we are investigating if there is any potential crosstalk at the vacuum rack that could be causing this.

More to come.

TITLE: 04/08 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: MAINTENANCE
    Wind: 2mph Gusts, 0mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.17 μm/s 
QUICK SUMMARY:

Some Workstations were rolled back to Debian 12 last night this will likely continue today. 
HAM1 is closed. 
GV 2 and GV5 are both closed. 
Looks the VAC team is Venting BSC2's volume to prep for the up coming work.

 

Most workstations in the front of the control are back on debian 12 after numerous crashes in debian 13.   

workstations directly across the aisle (cdsws 27 etc) are still debian 13.  All front workstations are downgraded to debian 12 except cdsws39 and cdsws28, which are still debian 13.  Operator workstations are downgraded.

Following the fix of the DAC problem on h1seih7 and the re-install of the 3 ADCs, we restarted the DAQ to cover the WPs:

WP13132: +1 ADC SUSB2H34

h1iopsusb2h34 fully up to date

h1suslo12 DAQ update, EDC update needed

WP13133 +1 ADC SUSAUXB2H34

h1iopsusauxb2h34 fully up to date

h1susauxb2h34 needs model changes to use new ADC (Oli)

WP13100 +3 ADC SEIH7

h1iopseih7 fully up to date

h1susauxh6 DAQ updated, EDC update needed

WP13142 SPIH23

h1spih23 DAQ updated, EDC update needed.

------------------

So all WPs have some tasks left before I can close them.

TITLE: 04/07 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:

HAM1 +y door removed (installed, thanks Betsy!) in the morning and Corner venting has begun (continues tomorrow).  h1seih7 was fixed and there was a daq restart for all the model changes from yesterday/today.  With the CDS work, guardian reboots, and other work which took SEI/SUS to non-standard states, everything looks mostly green on the OPS OVERVIEW for SUS & SEI.
LOG:

• 1339-1640 Technical cleaning in lvea (nellie)
  • 1506-1530 out for a break & back out at 1530
• 1440-1515 HAM3 clean-up (randy)
• 1530 PCal Lab and then EY for meas (tony.dripta)
  • 1627 ETMy ALIGNED (from MISALIGNED)
• 1550-1638 FCES Air Handler maintenance (eric)
• 1554 Install HAM1 +y door (travis,jordan,randy)
  • 1608 HAM2 (+HAM1, obviously) ISI tripped, so I took to DAMPED during door work.
  • 1629 Running a clamp out to HAM1 team (ibrahim)
• 1602 new timing card for h1sei7 (erik,patrick,dave, marc)
• 1645 BSC2 & HAM6 in-rack work (fil)
• 1703-1732 Checking BSC2 stop screws for HEPI (jim)
  • 1740-1752may return w/ ruler
• 1710-1736 Working on new dustmonitor in DiodeRoom (ryanC)
• 1712 Checking on fil in the CER (richard)
• 1739 Status Clean-up (betsy request):
  • ALIGNED PRM, SRM, MC2, PR2,  (just to have a good baseline)
  • Waiting on HAM1 doors and then will return HAM1 & HAM2 to 
• 1745 CHeTA Lab work, local laser hazard (camilla,madi,sophie)

1830-1920:  I stepped away to give a tour for kids on spring break and staff members of the Yakama Nation (Many thanks to RyanC for covering the chair in my stead).

• .2000 BSC2 & HAM6 in-rack work continued (fil)
• 2027 PCal Lab work (tony)
• 2028 Rebooting h1guardian1 for quarterly maintenance (tj)
  • ~2122  Jennie noticed on OPS OVERVIEW that we had 2W for JAC INPUT POWER.  This also probably restored 2W for input power.  Jennie took it to 0W
• 2045-2245 Vent prep & venting (travis, jordan)
  • 2123 Jordan brought in the checklist to address HIGH VOLTAGE items to address before venting:
    • Can't remember the verbiage, but there was mention of confirming "HEPI is safe".  Not clear what this meant, so I phoned Jim and he said take SEI Guardians to ISI_DAMPED_HEPI_OFFLINE. This was done for all Corner station SEIs.
    • For High Voltage, Jordan had this checklist document:  M1300464  (HEPIs are not listed in this document, btw):
      • Picomotors:  most of these were already disabled.
        • There were some which were enabled (1. SQZT0 and 2. HAM7 + SQZT7 ), these were disabled.
      • Ring Heaters---VAC team takes care of these on the floor.
      • SQZ OPO Tec:  SQZ OVERVIEW / TECs (blue button) / OPO from drop down ---> Servo already disabled.
        • Document (M1300464) mentioned this which was a little confusing:  go to the SQZ Overview & open the OPO dropdown (it's actually the TEC dropdown).
      • HAM1's already vented, but after Jordan chatted with Fil, decided to kill the PZT at HAM1 (for JAC?)
• ~2120-2150 ISCT1 was rolled back near HAM1---to clear up space for a garb room (ibrahim, randy)
• 2135 viewport inspection in optics lab(camilla, madi)....then off to CHeTA with Sophie...
• 2233 CHeTA lab work, local laser hazard (sophie, camilla, madi)

(Travis, Randy, Gerardo)

On Monday, the -Y door went on the HAM1 chamber with some minor issues not noted on previous installations, for some reason we had two minor misalignments: one, the door did not hung parallel to the HAM's flange,small tilt towards the outside on the upper part of the door, maybe the pick point slid forward.  Two, the door required a clocking move, we pinned two holes spanning 5:12 O'clock, then rotated the door clockwise a bit until all of the holes aligned, then a small movement on the -Z to complete the alignment about 1/8".  After all of that the door looks pretty concentric to the chamber flange.

Something to note, a dirty glove was found inside the chamber, yes inside the chamber under the support tube on the -Y side of the chamber, as I write, I nod, because it does not take much time to get this dirty thing out of the chamber.

We ran the OPLEV charge measurements this afternoon. We had a env / package issue trying to start the script, it was complaining about the scipy sin function, I ended up changing from the default cds env to the aligoNB using "conda activate aligoNB" after doing a pip env search to find which environment had the needed packages, I still had scipy sin issues but they were depreciation warnings. To fix this script we may be to rewrite the scipy parts with numpy. The End Stations SEI configuration was ISI_DAMPED_HEPI_OFFLINE. This was a pretty good measurement unlike a few of the previous ones, I didn't get any saturations on either QUAD and the coherence was pretty good.

ETMY's charge is a little high (above 50 on half of the plots) but it is trending to zero or is mostly static near zero (UR P).

ETMX's charge is high (above 50 on all but 2/8 plots but not quite at 100) and is trending away from zero, increasing. The ETMX_L3_LOCK_BIAS_OFFSET value has been at its "unlocked" value of -8.9 during the break, it flips to ~+6 when we are in full lock.

We are still fully processing and thinking about the results, more to come.

In order to clear up the incoming file changes on 22 nodes and to satisfy the quarterly reboot FAMIS, I rebooted the machine 13:30PT. All 176 nodes came back on their own. Me, Corey, and Ryan C cleaned up the requested states for suspensions and other various nodes and brought SEI HAM1,2,3 and BSC2,3 chamber managers to ISI_DAMPED_HEPI_OFFLINE, IMC_LOCK to Offline, ISC_LOCK to Idle. 

Tue Apr 07 10:10:57 2026 INFO: Fill completed in 10min 53secs

Erik is powering down the h1seih7 system to continue our recovery work. First up: replace the timing card to see if we can get the 16bit-DAC operational again.

WP13100 Add 3 ADC to h1seih7 for h1susauxh6

Marc, Jeff, Corey, Jim, EJ, Erik, Dave:

After being tested on the DTS, 3 ADCs were added to h1seih7 for HAM6 SUSAUX. We took the opportunity to upgrade the firmware on the timing card and replace its sync-ribbon.

After the upgrade the single 16bit-DAC on this system ran immediately into a FIFO-EMPTY state and the IOP has a permanent DAC status. We verified the card and cable seating, all good but no change. We removed the 3 new ADCs, no change. We removed the 3 new ADC Interface cards, no change.

At this point we ran out of time, Jim said it was OK to leave HAM7 SEI down for the night. We will try timing card and DAC swapouts Tuesday.

WP13115 Reduce susb13 SWWD trip times

Jeff, Corey, Dave:

I installed a modified h1iopsusb13 which reduced the total SWWD SUS trip times for the ITMs from 20 mins to 15 mins ( from 5+15 to 5+10).  All models on h1susb13 were restarted, no DAQ restart was needed.

WP13132 Add ADC to h1susb2h34

Marc, Erik, Jeff, Corey, EJ, Dave:

After being tested on the DTS, an additional ADC was added to the h1susb2h34 IO Chassis. The timing card sync-ribbon was also replaced.

The h1iopsusb2h34 model was modifed to add the ADC. A DAQ restart is needed (pending).

WP13133 Add ADC to h1susauxb2h34

Marc, Erik, Jeff, EJ, Dave:

After being tested on the DTS, an additional ADC was added to the h1susauxb2h34 IO Chassis. The timing card sync-ribbon was also replaced.

The h1iopsusauxb2h34 model was modifed to add the ADC. A DAQ restart is needed (pending).

No DAQ Restart Was Done

Due to the h1seih7 issues we did not restart the DAQ on Monday. This means we have bad DAQ data for the models:

h1iopsusb2h34, h1iopsusauxb2h34, h1spih23.

Tuesday we will fix the h1seih7 issue, then restart the DAQ to resync INI for the two B2H34 models and add the new models h1spih23, h1suslo12, h1susauxh6.

[Tom, Sophie, Ibrahim, Betsy]

Thursday, Friday and Saturday of last week we assembled a batch of 4 QOSEM In-Vac cables (D2500311) for use at LLO on the BBSS. All cables have passed electrical testing.

On Sunday, Betsy cleaned and began an airbake on the cables, and they have now begun there vacuum bake, which should finish Wednesday evening.