aLIGO LHO Logbook

H1 ISC - ISC HAM1 Components

camilla.compton@ligo.org — Fri, 11 Apr 2025 16:56:02 -0700

Author: camilla.compton@ligo.org

Report ID: 83875

Elenna, Matt, Camilla. Continuing ISC component inspection and prep for re-installation from 83858.

Elenna, Matt and I continued to first contact the optics in pans 1 and 2: M7, M11, M12 (new 90/10 BS), M13, M15 (New 50/50 BS), M16, M17, M18. After again inspecting some of those we cleaned yesterday, we decided to re-clean some. Some needed multiple first contacting, they aren't all perfect (there is a 1" long incredibly hard to see line on M15 and a mark in the center of M18 photo that I will ask a second option on), but otherwise we are calling these two pans of optics ready for re-installation.

For M15, I installed the picomotors that I removed from the right handed mount into a left handed siskiyou mount. I installed the manually adjustable actuators removed from the left handed mount into the right handed mount, this will be stored. Notes on how to do this are attached.

Still to be done: decide if M15 and M18 are okay or need swapping, clean optics in pan 3; inspect periscope mirrors; swap out any glass beamdumps we can.

Images attached to this report

Non-image files attached to this report

Picomotor_swap.pdf

H1 General - OPS Friday day shift summary

ryan.crouch@ligo.org — Fri, 11 Apr 2025 16:30:00 -0700

Author: ryan.crouch@ligo.org

Report ID: 83873

TITLE: 04/11 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: BSC8 work finished up and doors were put back on, HAM1 work continues, the ISI is all packed up and ready to move over to its new home.
LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
14:15	FAC	Randy	LVEA	N	HAM1 clean up	14:38
1416	FAC	Kim & Nellie	LVEA	N	Tech clean, Nellie out 15:43	16:16
14:58	FAC	Randy, Chris	LVEA	N	Craning, 15:30 Chris in	16:46
15:20	VAC	Jordan	LVEA	N	Purge air checks	15:31
15:36	ISC	Camilla	LVEA	N	HAM5/6 CR first contacting HAM1 optics	17:17
15:45	ISC	Elenna	LVEA	N	Join Camilla	16:58
16:32	VAC	Jordan	LVEA	N	HAM1 Feedthrough swap	19:39
16:46	IAS	Jason	LVEA	N	Scale reading attempt of the support tube, plus pack up FARO	17:02
16:47	VAC	Betsy, Travis, Jordan	LVEA	n	HAM1 feedthroughs, Betsy out 19:23	21:59
16:57	ISC	Carlos	LVEA	N	Checks	19:07
17:00	FAC	Richard	LVEA	N	Talk to Camilla	17:08
17:04	EE	Marc	Mezz	N	Label powersupplys	17:36
18:10	ISC	Josh, Keita	Optics lab	LOCAL	BS mirror measurements, Keita out 19:47	20:31
18:16	ISC	TJ	LVEA	N	Help with HAM1, cabling	19:05
18:39	FIT	Matt	Yarm	N	Going for a jog	19:01
18:59	ISC	Camilla, Elenna	LVEA	N	First contacting HAM1 optics, Elenna out 19:35	19:43
19:27	EPO	Marc + Others	LVEA	N	Tour	20:04
19:33	CDS	Dave	EndY	N	WD investigation	20:01
19:45	SEI	Jim	LVEA	N	Look at HEPIs	20:06
19:49	FAC	Randy	LVEA	N	Craning over YARM, BSC8 door prep	21:59
19:58	SUS	Rahul	LVEA	N	Grab RM1 and RM2	20:04
20:09	ISC	Betsy	LVEA	N	HAM1 cabling and BSC8 Door	21:59
20:27	FAC	Richard	LVEA	N	Safety checks	21:54
20:33	ISC	Camilla, Matt	LVEA	N	HAM5/6 CR Optics cleaning	21:12
20:46	IAS	Jason	LVEA	N	Check out IAS parts in a CR	20:53
21:13	ISC	Camilla, Matt	Optics lab	LOCAL	HAM1 optics work	22:34
21:17	OPS	Oli	LVEA	N	Talk with Betsy	21:38
23:20	ISC	Camilla, Matt	Optics lab	N	Take off first contact on optics	Ongoing

BSC8 - ITMY and R0 TFs after alignment complete DONE alog83876
HAM1 ISC prep - check all removed cables for loose screws DONE
HAM1 ISC prep - Inspect Optics and beam dumps, FC if needed Ongoing
HAM1 ISC - rework M12 and M15 DONE
HAM1 ISC prep - Recheck all RMs with FRS ticket issues DONE?
~~JASON - IAS HAM1 support tube ends?~~
BSC8 - Prep for Closeout DONE
BSC8 - DOOR ON DONE
HAM1 - Prep for ISI install DONE alog83879
VAC Start Feedthru Swap Ongoing?

H1 SUS - Comment to Comparison of all DOFs of SUS PR3 M1 In-air vs. In-vac TFs

edgard.bonilla@ligo.org — Fri, 11 Apr 2025 16:20:35 -0700

Author: edgard.bonilla@ligo.org

Report ID: 83883

I am adding a comparison between SR3 and PR3 in the attached pdf.

These are the in vacuum measurments for SR3 from 2024-08-08 (in solid red) vs. the in-vacuum ones for PR3 from LHO aLog 80683 (in dashed blue).

At a glance, the M1 Transverse and Vertical couplings to M1 Yaw are at the level we considered *bad* for PR3, so I think we might have to consider these couplings into account when we implement the estimator. We will have to see how the ISI interacts with these couplings before deciding that it is a problem.

Images attached to this report

LHO VE - Aril Vent - VAC Diary 4-11-25

jordan.vanosky@ligo.org — Fri, 11 Apr 2025 15:56:11 -0700

Author: jordan.vanosky@ligo.org

Report ID: 83884

Travis, Betsy, Randy, Jordan

- BSC8 -X door re-installed with one round of bolt torquing (will perform another round Monday), purge air increased prior to door install, then purge valve at YBM closed. Corner volume has slight overpressure and will be blown down to atm. prior to pumpdown

- Continued installation of HAM1 electrical feedthrus

- Scroll pump staged for CP1 RGA pumpdown and bake-out

H1 PSL - Power Ratio Measurements of the SPI Pickoff BS

joshua.freed@ligo.org — Fri, 11 Apr 2025 15:45:02 -0700

Author: joshua.freed@ligo.org

Report ID: 83863

J. Freed,

Today, with the gracious help of K. Kawabe, I took power meaurments of the SPI Pickoff BS (BST11) and its spare using S-polarized light

Results of the BST11 power ratio measurements for S-pol light
Optic	Reflected Power	Transmited Power
Main optic (TP03547140)	77% ± 7.7%	21% ± 2.1%
Spare(TP03435437)	76% ± 7.6%	22% ± 2.2%
Expected values from ThorLabs	81%	18% (BST11_Data.xlsx)

Due to the limited time and person power, we used a S121C PD to take these measurments, which we now realize has a 7% uncertainty at 1064nm with a >1mm diameter beam. Although we relized that the beam was too large after we finished the measurment of the main optic and added a lens to focus the beam during the spare measurement, we have no idea if the beam was ever below the 1mm threashold. As such even though we were using a PM100D power monitor which has a resolution of 0.1 mW, we have to quote an uncertainty of 10% of the final value for our meaurments. This is colaberated by the fact that mulitiple measurments of the same beam could yeild different reults when the PD was taken out of the beam path and put back in, but remained steady if left alone.

SPI-BS-PWR_MEAS.png Shows the measurment set up. The only pick off that was available was p-polarized, as such, we added another half wave plate/PBS combo to get S-Polarized light to our BS

There also existed a ghost beam from the AR-Coated wedge side of the BS that was not taken into acocount for the main optic but was for the spare. Though we dont think the ghost beams affected this measurment as they were 3 orders of magnitude of power below the main beams.

SPIPBSRATIOMEAS-3.txt is a text file containing extra notes as well as the power values measured. The power ratios were found by taking an average of all the trials and then divided by the power we measured just before the beam splitter.

Images attached to this report

Non-image files attached to this report

BST11_Data.xlsx

SPIPBSRATIOMEAS-3.txt

H1 SUS - Comment to ITMY ready for doors

oli.patane@ligo.org — Fri, 11 Apr 2025 15:38:53 -0700

Author: oli.patane@ligo.org

Report ID: 83882

Adding a PDF of the M0 measurements taken earlier, along with L, T, and R for M0 taken in that same configuration. These cannot be analyzed because they were taken with a different bin width, but more official measurements will be taken next week.

These extra measurements have been committed ot the svn and can be found at:

.../QUAD/H1/ITMY/SAGM0/Data/2025-04-11_1600_H1SUSITMY_R0_WhiteNoise_{L,T,R}_0p02to50Hz.xml r12215

Non-image files attached to this report

2025-04-11_1600_H1SUSITMY_M0_Mono_WhiteNoise_0p02to50Hz.pdf

H1 SUS - Comparison of all DOFs of SUS PR3 M1 In-air vs. In-vac TFs

jeffrey.kissel@ligo.org — Fri, 11 Apr 2025 15:35:38 -0700

Author: jeffrey.kissel@ligo.org

Report ID: 83880

J. Kissel Figured I'd make the same in-air vs. in-vac comparison of the whole 6 x 6 transfer function matrix for H1 SUS PR3 like I did for SR3 in LHO:83831. D R I V E D O F L T V R P Y L -- meh meh meh eand YI R T meh -- nd eand meh meh E S V YI YI -- nd meh nd P R meh eand YI -- YI meh D O P eand YI YI YI -- nd F Y YI nd nd nd nd -- Recall the legend is YI = Yes, Interesting. DC response magnitude is a bit different between vac and air, but not by much and all the resonances show up at roughly the same magnitude. meh = The resonant structure is different in magnitude, but probably just a difference in measurement coherence eand = The cross coupling is expected, and not different between air and vac. nd = Not Different (and unmodeled). The cross-coupling is there, but it doesn't change from air to vac. (1) For some reason, the data quality on the upper diagonal is worse for the PR3 in-air TFs vs. SR3's but better on the lower diagonal. The "mehs" in PR3's cases are more "man, I wish the coherence was better so we could make a better statement." (2) For the most part, the same DOFs that are "Yes, Interesting" for PR3 are "Yes, Interesting" for SR3. Needs a more careful study, but we're only looking at crappy in-air vs. good in-vac data because we're vented right now, and we want to see if it's sensible to measure these things in air, fit the data, and trust that that fit will work in vacuum. Given that we're seeing *any* of these elements as "Yes, Interesting -- there's a difference between in-air and in-vac" means that we're getting scared away from do that -- the problem is hard enough! We'll probably just end up waiting for the SUS to be back at vacuum in a few weeks.CSWG, SEI, SUS

Non-image files attached to this report

allhltss_2025-04-10_H1SUSPR3_M1_AirvsVac_ALL_TFs.pdf

H1 PSL - PSL Status Report - Weekly

ryan.crouch@ligo.org — Fri, 11 Apr 2025 15:34:00 -0700

Author: ryan.crouch@ligo.org

Report ID: 83881

Laser Status:
    NPRO output power is 1.839W
    AMP1 output power is 69.11W
    AMP2 output power is 139.0W
    NPRO watchdog is GREEN
    AMP1 watchdog is GREEN
    AMP2 watchdog is GREEN
    PDWD watchdog is GREEN

PMC:
    It has been locked 1 days, 3 hr 1 minutes
    Reflected power = 22.81W
    Transmitted power = 104.6W
    PowerSum = 127.4W

FSS:
It has been locked for 2 days 23 hr and 35 min
TPD[V] = 0.8157V

ISS:
The diffracted power is around 4.2%
Last saturation event was 4 days 5 hours and 23 minutes ago

Possible Issues: None reported

H1 SEI - HAM1 ISI moved into transport container, ready to move to OSB for install

jim.warner@ligo.org — Fri, 11 Apr 2025 14:39:11 -0700

Author: jim.warner@ligo.org

Report ID: 83879

Corey, Mitch, Randy, Jim

This morning we finished the gross cleaning of the outside of the storage container for the HAM1 ISI. This sat outside for many years so we started with pressure washing a week or two ago. Today, we wiped the outside of the can as best we could and shifted it into the staging building. We did another cleaning inside, getting what we could out of the latches vacuuming as we went. We then opened the can and cleaned both sealing surfaces of the can, the oring seal and scrubbed the ISI platform multiple times with alcohol wipes. After lunch we wiped it down a final time, used a bit of steel wool to remove some stubborn stains on the bottom of the platform then moved the ISI onto the suspended platform. The ISI is held in place with 4 3/8-16 screws through the top of stage 0 and around 10 all thread studs threaded into the support platform. Lid flew back on and we are ready for the trip to the OSB. Randy moved the install fixture into the LVEA yesterday, so we just have to move the ISI, install cart and lifting bridle to the LVEA. Looking pretty good for ISI install Monday or Tuesday.

Images attached to this report

H1 CDS - ETMY HWWD Test

david.barker@ligo.org — Fri, 11 Apr 2025 14:19:11 -0700

Author: david.barker@ligo.org

Report ID: 83878

Visually the ETMY HWWD looks nominal, all power LEDs are green. To test I unplugged the top monitor connector and after a few seconds the LED-FAULT red led lit up. After 8 seconds I plugged the monitor connector back in which cleared the LED-FAULT light.

Attached trend shows the HWWD STAT go to 8 (led current fault) and the countdown timer started counting down from 20 minutes (seconds channel shown).

It appears there is no problem with the HWWD unit itself, and the change in behavior since the power outage must be related to something upstream (satellite amps). I'll pass this onto Fil for further testing.

At this point I'm not sure if the ETMY hardware watchdog system is fully functional, but bear in mind this is a secondary watchdog to the IOP SWWD.

Images attached to this report

H1 SUS - Comment to ITMY ready for doors

oli.patane@ligo.org — Fri, 11 Apr 2025 12:44:22 -0700

Author: oli.patane@ligo.org

Report ID: 83877

Measurement	Mass?	R0 OPTICALIGN OFFSET Pitch value	M0 OPTICALIGN OFFSET Pitch value	Description
2025-04-10_1800	R0	0	-108 (nominal)	nominal
2025-04-10_2200	R0	-250	-108	R0 closest approach; R0 bottom tilted towards M0
2025-04-11_1600	M0	-250	+250	R0, M0 both closest approach; bottoms tilted towards each other

H1 AOS - CPY left with adjustment backed off a little

robert.schofield@ligo.org — Fri, 11 Apr 2025 12:20:51 -0700

Author: robert.schofield@ligo.org

Report ID: 83865

Betsy, Camilla, Sheila, Tony, Robert

After Wednesday’s discovery that the PUM-level inter-chain stops would prevent us from overlaping the ITMY AR optical lever beam and the arm-cavity side CPY beam (overlapping these beams gives the correct orientation of CPY), we decided to back off the adjustment just a little to reduce the chance of touching and leave the beams closer than prior to the vent, though not overlapping. At the end of Wednesday, the beams that were supposed to be overlapped were about 0.18 of the ITMY HR - ITMY AR spot distance. They were still at 0.18 Thursday morning and, after backing off a little, were at 0.22 of the HR-AR distance (with the same 0,0 slider settings they started out at 0.32).

These measurements were made with the R0 sliders at 0 pitch and 0 yaw. We also found the slider settings for the closest approach (see figure). At this closest approach the spots only differ by 0.085 of the HR-AR distance (3.4e-4 radians).

I calibrated the CPY sliders assuming the ITMY HR - ITMY AR spots were 4e-3 radians apart, due to the 0.08 degree wedge with assumed 1.45 index of refraction (coatings not considered). I get 0.63 microradians per slider unit in pitch and 0.69 in yaw. The calculated separation of the HR-AR spots, 4e-3 radians, was approximately equal to the measured separation, 3.8 e-3 radians, assuming we were 32 meters from the test mass.

Non-image files attached to this report

Final-CPY-position.pdf

H1 SUS - ITMY ready for doors

oli.patane@ligo.org — Fri, 11 Apr 2025 11:56:12 -0700

Author: oli.patane@ligo.org

Report ID: 83876

I took transfer functions for ITMY's M0 and R0 to check for any rubbing that might have been caused by the negative pitch adjustment made to R0 (83865). Most importantly, we wanted to make sure that a negative pitch offset in the R0 OPTICALIGN OFFSET sliders wouldn't cause R0 to hit anything when driven. The negative pitch means that R0 is tilted away from M0, so the bottom of R0 juts towards the bottom of M0.

First I took a set of regular R0 transfer function measurements with the R0 offset sliders at 0. These look good.

I then set the R0 Pitch offset slider to -250, which we are unlikely to go past (typically that slider is set to mid +200s). We called this the 'closest approach'. I wasn't able to set the slider to its full offset of -440, because then the DAC range is so limited that we aren't able to drive it to take any measurements. These transfer functions also all look good. We especially made sure that Pitch was looking good and not rubbing anywhere.

To be even more certain that we weren't going to end up with anything touching, we ran a few transfer functions on M0 with a 'double closest approach' setup. With the R0 Pitch slider still set to -250, I changed the M0 Pitch slider to +250, tilting the bottom of M0 towards the bottom of R0, putting them even closer. I then checked Pitch, Vertical, and Yaw, with Pitch being the most important in telling us whether we were anywhere near close to having them hit anything. Those also all came back clean (Yaw looks weird but Jeff assured me that that's due to cross-coupling movement that went away when we reran it with damping loops on*).

We are confident that the adjustments made in the chamber didn't put us at risk of rubbing, and so doors are clear to go on. Once doors are back on we will check again.

These measurements have been committed to svn and can be found at:

.../QUAD/H1/ITMY/SAGR0/Data/2025-04-10_1800_H1SUSITMY_R0_WhiteNoise_{L,T,V,R,P,Y}_0p01to50Hz.xml r12208

.../QUAD/H1/ITMY/SAGR0/Data/2025-04-10_2200_H1SUSITMY_R0_WhiteNoise_{L,T,V,R,P,Y}_0p01to50Hz.xml r12208

.../QUAD/H1/ITMY/SAGM0/Data/2025-04-11_1600_H1SUSITMY_R0_WhiteNoise_{V,P,Y}_0p02to50Hz.xml r12212

Results have been committed to svn and can be found in:

.../QUAD/H1/ITMY/SAGR0/Results/2025-04-10_1800_H1SUSITMY_R0_ALL_TFs.pdf r12210

.../QUAD/H1/ITMY/SAGR0/Results/2025-04-10_2200_H1SUSITMY_R0_ALL_TFs.pdf r12210

* Full explanation from Jeff: "the 'weirdness' in yaw is the several frequency points where the reference looks smooth as a function of frequency between resonances, and the new data has 'lots' of single-data-point excursions from that smoothness. I attribute this to lack of coherence, and lots of motion on the QUAD. Yaw is a differential measurement of F2 and F3. We’re already having to drive less than normal because we have large offsets on. But also, we typically see that since there’s lots of motion, the imperfect calibration of the F2 and F3 sensors shows up, and lots of other DOF’s resonances show up at a low level where they shouldn’t. Turning on the damping loops and measuring again with them on is the confirming evidence that this is what’s going on. We took the same TF with the R0 and M0 chains damped and they look good."

Images attached to this report

Non-image files attached to this report

2025-04-10_1800_H1SUSITMY_R0_ALL_TFs.pdf

2025-04-10_2200_H1SUSITMY_R0_ALL_TFs.pdf

LHO VE - Fri CP1 Fill

david.barker@ligo.org — Fri, 11 Apr 2025 10:14:42 -0700

Author: david.barker@ligo.org

Report ID: 83874

Fri Apr 11 10:10:04 2025 INFO: Fill completed in 10min 1secs

Images attached to this report

H1 General - Comment to OPS Friday DAY shift start

ryan.crouch@ligo.org — Fri, 11 Apr 2025 09:43:03 -0700

Author: ryan.crouch@ligo.org

Report ID: 83872

The IAS support tube survey will likely not happen as the recent power outage has seemingly damaged the FARO (specifically its external temperature sensor) and it needs to be seen by their service team. We are waiting to hear about a rental unit in the meanwhile.

LHO VE - Morning Purge Air Checks 4-11-25

jordan.vanosky@ligo.org — Fri, 11 Apr 2025 08:43:25 -0700

Author: jordan.vanosky@ligo.org

Report ID: 83871

Morning dry air skid checks, water pump, kobelco, drying towers all nominal.

Dew point measurement at YBM , approx. -42C

Images attached to this report

H1 CDS - Comment to h1susauxex redundant power supply not visible by IPMI sensor scan

david.barker@ligo.org — Fri, 11 Apr 2025 08:34:49 -0700

Author: david.barker@ligo.org

Report ID: 83870

FRS33834

H1 SYS - Vent Status this week

betsy.weaver@ligo.org — Fri, 11 Apr 2025 08:05:52 -0700

Author: betsy.weaver@ligo.org

Report ID: 83869

Attached is the Trello showing what has been achieved this week and what is on the books for today. Many things started yesterday were (expectedly) not finished in 1 day so will roll to today, namely finishing feedthru (and some cable) population in the empty HAM1 chamber, and evaluating ITMY and it's reaction chain for closeout given the new CPY slight pitch change. The ISI is ~en route from the staging building to the LVEA ~today in prep for install early next week. Things seem to be on schedule with how I had them laid out in the plan, even after the Monday schedule loss due to the gnarly power outage and EE component failures which took the vent staff all day to recover from.

Images attached to this report

H1 General - OPS Friday DAY shift start

ryan.crouch@ligo.org — Fri, 11 Apr 2025 07:32:45 -0700

Author: ryan.crouch@ligo.org

Report ID: 83868

TITLE: 04/11 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: 5mph Gusts, 3mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.22 μm/s
QUICK SUMMARY:

Left over tasks from yesterday:

ONGOING BSC8 - ITMY and R0 TFs after alignment complet
ONGOING HAM1 ISC prep - check all removed cables for loose screws
ONGOING HAM1 ISC prep - Inspect Optics and beam dumps, FC if needed
ONGOING HAM1 ISC - rework M12 and M15
HAM1 ISC prep - Recheck all RMs with FRS ticket issues
~~JASON - IAS HAM1 support tube ends?~~

On the docket for today is:

BSC8 - Prep for Closeout

BSC8 - DOOR ON

HAM1 - Prep for ISI install

VAC Start Feedthru Swap

LHO VE - Comment to 2025 April vent - VAC diary

jordan.vanosky@ligo.org — Thu, 10 Apr 2025 21:14:43 -0700

Author: jordan.vanosky@ligo.org

Report ID: 83867

Picture of the completed D6 port on HAM 1, with new feedthrus and assembled five way cross extension.

Images attached to this report

LHO VE - Comment to 2025 April vent - VAC diary - new 5-way coax conenctors and feedthrus

betsy.weaver@ligo.org — Thu, 10 Apr 2025 19:25:39 -0700

Author: betsy.weaver@ligo.org

Report ID: 83866

The new RF 5-way coax cable in the feedthrus are a little tight in the 5-way cross, but seemed to work ok. Also, the connections on the 4.5" feedthru port are a deep pocket connection so I was not convinced that the new connector was fully seated since you could not visually see it. Marc came out and checked continuity to settle my fears given the newness of this joint and the fact that we have many more to do. All good so far.

Images attached to this report

LHO VE - 2025 April vent - VAC diary

travis.sadecki@ligo.org — Thu, 10 Apr 2025 18:09:11 -0700

Author: travis.sadecki@ligo.org

Report ID: 83864

Today's activities:

HAM1 feedthrus were installed according to D1002872-v10. D6 is completely populated. D1 was populated with everything except the feedthrus on the 5-way cross. Those will be added in the next days. The 3-port adapter (currently on D4 but destined for D3) has completed 1 of 2 feedthru swaps.
CP1 RGA is being revisited.

H1 CDS - HAM1 AIR RFPD Cables

filiberto.clara@ligo.org — Thu, 10 Apr 2025 16:55:05 -0700

Author: filiberto.clara@ligo.org

Report ID: 83862

WP 12451

The air RFPD cables were disconnected from the HAM1 feedthroughs (D6 and D5) and pulled back to ISC-R2. Cables were disconnected from the patch panels and removed from the rack. The air REFL WFS cables going to ISCT1 were removed, this included POPAIR_X. Daniel started installation of the new/modified patch panels in ISC-R2. The long RF cables will be re-terminated/labeled next week in the EE lab with female SMA connectors.

F. Clara, R. McCarthy, M. Pirello, D. Sigg

ISC

H1 CDS - Comment to HAM1 In-Vacuum RFPD Cables

marc.pirello@ligo.org — Thu, 10 Apr 2025 16:54:56 -0700

Author: marc.pirello@ligo.org

Report ID: 83861

The following cable serial numbers were modified, 4 short, 7 long:
S1301446 short
S1301447 short
S1301450 short
S1301458 short
S1301467 long
S1301468 long
S1301469 long
S1301470 long
S1301472 long
S1301473 long
S1301476 long

Images of cable modifications attached below:

Images attached to this report

H1 General - Ops Day Shift End

oli.patane@ligo.org — Thu, 10 Apr 2025 16:47:37 -0700

Author: oli.patane@ligo.org

Report ID: 83860

TITLE: 04/10 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:

Most things from today are either done or partially done.

DONE HAM1 CRANE/FORKLIFT - SEI Stack removal, continued
DONE BSC1 (via BSC8) - CPY work - crew to map beams inside at spool, adjustment continued (Betsy, Robert, Sheila, Tony)
ONGOING BSC8 - ITMY and R0 TFs after alignment complet
ONGOING HAM1 ISC prep - check all removed cables for loose screws
ONGOING HAM1 ISC prep - Inspect Optics and beam dumps, FC if needed
ONGOING HAM1 ISC - rework M12 and M15
HAM1 ISC prep - Recheck all RMs with FRS ticket issues
JASON - IAS HAM1 support tube ends?

LOG:

`Start Time`	`System`	`Name`	`Location`	`Lazer_Haz`	`Task`	`Time End`
`14:00`	`FAC`	`Kim, Nellie`	`LVEA`	`n`	`Tech clean`	`17:37`
`14:57`	`FAC`	`Randy`	`LVEA`	`n`	`Prepping for craning`	`15:26`
`15:28`	`SEI`	`Jim, Mitchell, TJ, Jennie`	`LVEA`	`n`	`HAM1 Stack removal cont (TJ out 18:02, Mitchell,Jennie out 18:10)`	`18:14`
`15:29`	`VAC`	`Jordan`	`LVEA`	`n`	`Purge air checks`	`15:39`
`15:56`	`SEI`	`Corey`	`LVEA`	`n`	`Joining HAM1 SEI crew`	`18:13`
`15:57`	`EE`	`Fil`	`OpticsLab`	`n`	`Making cables`	`18:33`
`15:58`	`ISC`	`Camilla`	`LVEA`	`n`	`HAM1 optics checks`	`18:00`
`16:00`		`Betsy, Robert, Tony, Sheila`	`LVEA`	`n`	`CPY work`	`18:16`
`16:14`	`EE`	`Marc`	`OpticsLab`	`n`	`Helping Fil with cables`	`18:33`
`16:28`	`ISC`	`Elenna`	`LVEA`	`n`	`Joining Camilla`	`18:00`
`16:55`		`Richard`	`LVEA`	`n`	`Checking that everyone is working safely`	`17:30`
`17:03`	`VAC`	`Travis`	`LVEA`	`n`	`Grapping parts`	`18:25`
`17:09`	`VAC`	`Jordan, Melina`	`LVEA`	`n`	`Grabbing parts`	`19:07`
`17:29`	`FAC`	`Tyler, Erik`	`Roof`	`n`	`Inspecting skylights`	`17:34`
`18:34`	`EE`	`Fil, Marc`	`LVEA`	`n`	`Removing HAM1 cables`	`19:48`
`18:52`	`HAM1`	`Camilla, Elenna`	`LVEA & Optics Lab`	`N`	`Cleaning optics & getting parts`	`19:24`
`19:08`	`FAC`	`Nellie`	`HAM Shack`	`n`	`Tech clean`	`21:03`
`19:35`		`Jennie`	`LVEA`	`N`	`Take care of used wipes`	`19:54`
`19:35`		`Jennie`	`OpticsLab`	`n`	`Putting wipes away`	`19:45`
`19:35`	`VAC`	`Travis`	`LVEA`	`n`	`HAM1 cable work`	`23:28`
`19:39`	`VAC`	`Jordan, Melina`	`LVEA`	`n`	`HAM1 cable work`	`23:28`
`19:42`		`Tony, RyanC`	`LVEA`	`n`	`BSC8 inventory`	`20:51`
`19:47`	`FAC`	`Randy`	`LVEA`	`n`	`Craning`	`21:44`
`19:54`	`EE`	`Fil, Marc`	`LVEA`	`n`	`Pulling more cables (Marc out 20:45)`	`22:26`
`19:57`		`TJ`	`LVEA`	`n`	`Dropping off stuff`	`20:05`
`20:01`		`Betsy`	`LVEA`	`n`	`HAM1 cable help`	`20:44`
`20:05`	`ISC`	`Josh, Keita, Jeff`	`OpticsLab`	`y(local)`	`Testing SPI (Jeff out 22:04)(Keita out 23:43)`	`23:51`
`20:14`	`ISC`	`Camilla, Elenna`	`LVEA`	`n`	`Continuing optics check`	`22:17`
`20:27`		`Richard`	`LVEA`	`n`	`Seeing Marc and Fil`	`21:54`
`20:28`	`CDS`	`Dave`	`EY`	`n`	`Labeling a bad port`	`21:28`
`21:08`		`Tony`	`CER-ish, pcal lab`	`n`	`Putting box back`	`21:13`
`22:26`		`Marc, Fil`	`LVEA`	`n`	`Helping Betsy`	`23:10`
`22:26`		`Betsy`	`LVEA`	`n`	`Pulling cable help`	`23:26`
`22:27`		`Richard`	`LVEA`	`n`	`Checking in on everyone`	`23:27`
`23:07`	`HAM1`	`Camilla & Elenna`	`HAM1`	`N`	`First contacting & optics cleaning`	`23:42`

H1 ISC - HAM1 ISC Components Inspection, Cleaning and Updating so far...

camilla.compton@ligo.org — Thu, 10 Apr 2025 16:46:32 -0700

Author: camilla.compton@ligo.org

Report ID: 83858

Elenna, Camilla

We started to inspect the optics and beam dumps removed from HAM1 in 83836. They look dustier than expected, but after first contacting the optics are looking good, more to do...

We replaced qty3 black glass beam dumps (BD4, BD10, BD12) that were slightly damaged with DLC coated SS plates D1800140 type 01 or 02. Alena suggested if we want to and have enough DLC coated plates, we could swap them all, there is still QTY 6 more glass ones. Black glass was placed in optics lab wiht other black glass.
We inspected all the optics in Pan3 (M1, M2, M5, M14, M18, L1), they all had dust on them. M2 and M14 were the only two that had the middle ~1" of optic clean. Did not do any cleaning of this pan yet.
Removed the optic from M15 (E1100048-v2 2.0-0990 HR 1064) and from M12 (E1000871-v1-02 AFT PL w04 95/5 BS), they will be moved back to the staging building optics storage. Removed the picos and beamdump from M15 and found a LH mount.
Chose new optics for M15 (E1000671-v1-02 “ATF PL W 057”) and from M12 (E40512-B3 IO820-05)
We inspected the optics in pan 1 and pan 2 (googledoc linked from D1000313) all of them had some dust so we top-gunned them all.
We first-contacted (E1000079, E1300017) M11, M7, M17, and the future 90/10 for M12 with FC. M11, M7, M17 looked great so we reinstalled in their mounts, Left FC on the other side of M12.
There is more to do.

H1 CDS - HAM1 In-Vacuum RFPD Cables

filiberto.clara@ligo.org — Thu, 10 Apr 2025 16:23:38 -0700

Author: filiberto.clara@ligo.org

Report ID: 83859

The In-Vacuum RFPD cables needed for HAM1 were re-terminated. Connectors that mate to the feedthrough are the new 5-way coaxial connectors. The connector that connects to the PD was not modified. Total of 11 cables were re-terminated. Cables were tested for continuity and a TDR test was performed using the Keysight FieldFox Analyzer.

D1300278 Qty 7 length 156”
D1300278 Qty 4 length 106”

F. Clara, C. Gray, M. Pirello

ISC

H1 CDS - h1susauxex redundant power supply not visible by IPMI sensor scan

david.barker@ligo.org — Thu, 10 Apr 2025 13:11:24 -0700

Author: david.barker@ligo.org

Report ID: 83857

This morning I ran a full IPMI sensor scan on all the realtime front ends and h1susauxex could only see one of its two redundant power supplies. I drove out to EX to inspect and found that both PS look fine with green LEDs. One at a time, I disconnected the power cord and pulled the PS out of the chassis, waited until the LED extinguished and then reinserted. This has made no change to the IPMI Sensor reporting. I'll flag this unit as an exception when reporting failed power supplies.

IPMI Sensor h1susauxex:

IPMI Sensor h1susauxey for comparison:

H1 SUS - Quick Check -- H1SUSITMY TFs In-Air Prior to CP Alignment Work :: TURNED OFF ITMY L2 to R0 TRACKING FEEDBACK

jeffrey.kissel@ligo.org — Thu, 10 Apr 2025 13:04:31 -0700

Author: jeffrey.kissel@ligo.org

Report ID: 83856

J. Kissel, O. Patane, I. Abouelfettouh, B. Weaver Betsy asked Ibrahim to gather some health check transfer functions in air prior to their CP work yesterday. He'd struggled for a bit to drive standard templates on the reaction chain, and called in re-inforcements. We reminded each other that "R0 tracking," or "L2 to R0 damping", or "the L2DAMP path" exists that uses the PUM (L2) OSEMs in feed back to the reaction chain (R0) to keep the chains moving together (ECR E2000011, built into all QUAD front-end models Jan 10 2020 LHO:54416, installed the next Tuesday LHO:54506, quickly and obviously became useful on the ETMs LHO:54556, but only turned on for the ITMs for the first time on Nov 10 2022 LHO:65728). It is *not* a DC coupled loop, it's an AC-coupled "velocity damping" controller, but it does have a giant amount of gain with a resgain filter right at 3.3 Hz. This tracking needs to be turned off during standard M0 or R0 "health check" transfer functions for *all* quads. They go unstable with huge (but standard health check) drive going to the main chain. We've run into having accidentally left these loops on for the ETMs before (LHO:60482), but this is the first time it's popped up for the ITMs, since it's the first time in a while we've characterized the ITMs. Anyways, we found it, turned the ITMY L2 to R0 damping/tracking OFF (ITMX remains ON), and the main and reaction chain TFs that Ibrahim gathered went without a hitch after turning it off. These TFs are /ligo/svncommon/SusSVN/sus/trunk/QUAD/H1/ITMY/SAGM0/Data/ 2025-04-09_1330_H1SUSITMY_M0_Mono_WhiteNoise_V_0p02to50Hz.xml 2025-04-09_1330_H1SUSITMY_M0_Mono_WhiteNoise_P_0p02to50Hz.xml 2025-04-09_1330_H1SUSITMY_M0_Mono_WhiteNoise_Y_0p02to50Hz.xml /ligo/svncommon/SusSVN/sus/trunk/QUAD/H1/ITMY/SAGR0/Data/ 2025-04-09_1800_H1SUSITMY_R0_WhiteNoise_V_0p02to50Hz.xml 2025-04-09_1800_H1SUSITMY_R0_WhiteNoise_P_0p02to50Hz.xml 2025-04-09_1800_H1SUSITMY_R0_WhiteNoise_Y_0p02to50Hz.xml Pressed for time, we did NOT take all DOFs. Just wanted to get these TFs mentioned in the aLOG. ISC, OpsInfo

H1 SEI - Comment to HAM1 Passive stack out

jennifer.wright@ligo.org — Thu, 10 Apr 2025 12:19:29 -0700

Author: jennifer.wright@ligo.org

Report ID: 83855

More pics of the absence of optics for EPO.

EPO

H1 SEI - HAM1 Passive stack out

jim.warner@ligo.org — Thu, 10 Apr 2025 11:22:38 -0700

Author: jim.warner@ligo.org

Report ID: 83854

Randy, Mitch, TJ, Jennie, Corey, Jim

This morning we pulled the rest of the HAM1 PISI. This part was relatively trouble free, masses stuck to the viton corks a bit, so we put a bit of tension on the chain bridle then tugged on the mass till it popped free. Masses, springs and hardware were kept clean, the support table and risers were set out on the floor. I think vac is up next with feedthrus, the ISI still has to be swapped to a different container in staging.

Images attached to this report

LHO VE - Thu CP1 Fill

david.barker@ligo.org — Thu, 10 Apr 2025 10:15:39 -0700

Author: david.barker@ligo.org

Report ID: 83853

Thu Apr 10 10:11:06 2025 INFO: Fill completed in 11min 3secs

Images attached to this report

H1 SUS - Comment to FYI - new models and screens in userapps/sus/

brian.lantz@ligo.org — Thu, 10 Apr 2025 09:15:38 -0700

Author: brian.lantz@ligo.org

Report ID: 83852

SVN update for Estimator models and screens - we should be ready to update SR3 at LHO

sus/common/models$ svn ci -m"new library part for a 1DOF estimator created. two are now in the SIX...MASTER_W_EST"
Adding ESTIMATOR_PARTS.mdl
Sending SIXOSEM_T_STAGE_MASTER_W_EST.mdl
Committed revision 31234.

sus/common/medm$ svn ci -m"updated estimator screens to be generic"
Sending        estim/CONTROL_6.adl
Sending        estim/ESTIMATOR_OVERVIEW.adl
Sending        estim/FADE_CONTROL.adl
Sending        estim/OSEM_SELECT.adl
Sending        hxts/SUS_CUST_HLTS_OVERVIEW_W_EST.adl
Committed revision 31235.

NOTE - The estimator pulls pieces from sus/common/models, sus/common/medm AND isi/common/models (that is where the fader lives)

(I've also committed the top level model from Stanford - isi/s1/s1suspr3.mdl)

LHO VE - Morning Purge Air Checks 4-10-25

jordan.vanosky@ligo.org — Thu, 10 Apr 2025 09:05:44 -0700

Author: jordan.vanosky@ligo.org

Report ID: 83851

Morning dry air skid checks, water pump, kobelco, drying towers all nominal.

Dew point measurement at YBM , approx. -44C

Images attached to this report

H1 CDS - MX weather station has a sticky anemometer, records 0mph in low wind speed conditions

david.barker@ligo.org — Thu, 10 Apr 2025 09:02:57 -0700

Author: david.barker@ligo.org

Report ID: 83850

Following on Oli's discovery that the MX wind speed was zero for many hours Tue night/Wed morning, it appears that the MX anemometer sticks when the wind speed is below 5mph. The attached plot shows MX (red) and EX (blue) wind speed comparison.

I noticed the same thing when observing MX anemometer from the road side, it look a good gust of wind before it got moving. Tagging PEM.

PEM

Images attached to this report

H1 SEI - Comment to Passive stack optical table removed from HAM1, was tougher than expected.

oli.patane@ligo.org — Thu, 10 Apr 2025 07:41:15 -0700

Author: oli.patane@ligo.org

Report ID: 83849

Attaching additional photos of the table removal and tagging EPO

EPO

Images attached to this report

H1 General - Ops Day Shift Start

oli.patane@ligo.org — Thu, 10 Apr 2025 07:37:39 -0700

Author: oli.patane@ligo.org

Report ID: 83848

TITLE: 04/10 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: 5mph Gusts, 3mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.12 μm/s
QUICK SUMMARY:

Plans for today:

BSC8 - ITMY and R0 TFs after alignment complete
HAM1 CRANE/FORKLIFT - SEI Stack removal, continued
HAM1 ISC prep - Recheck all RMs with FRS ticket issues
HAM1 ISC prep - check all removed cables for loose screws
HAM1 ISC prep - Inspect Optics and beam dumps, FC if needed
HAM1 ISC - rework M12 and M15
JASON - IAS HAM1 support tube ends?
BSC1 (via BSC8) - CPY work starts - crew to map beams inside at spool, adjustment continued (Betsy, Robert, Sheila, Tony)

LHO VE - Comment to Replacement of HAM6 Turbopump

janos.csizmazia@ligo.org — Wed, 09 Apr 2025 20:55:59 -0700

Author: janos.csizmazia@ligo.org

Report ID: 83847

Nice work, guys! Looks great!

H1 CDS - Comment to MX weather station wind speed sensor not working

david.barker@ligo.org — Wed, 09 Apr 2025 17:10:48 -0700

Author: david.barker@ligo.org

Report ID: 83846

Literally minutes after I made this alog, unbeknownst to me, it fixed itself. I drove to MX this afternoon and visually confirmed the paddles were turning and appared to be unrestricted. The freeze between 10pm Tue and 9am Wed is still a mystery.

Images attached to this report

H1 CDS - Recovery from Sunday power outage

david.barker@ligo.org — Wed, 09 Apr 2025 17:07:10 -0700

Author: david.barker@ligo.org

Report ID: 83845

Jonathan, Erik, Dave.

IPMI end station HWS computers:

After the power outage both h1hws[ex,ey] computers' IPMI ports went off-line. I went to h1hwsex this afternoon and reset the computer into BIOS to check that its IPMI network setting were correct, they were. Back in the CUR Jonathan and myself went through the sw-ex-stk setting to ensure that switch2-port8 was on the ADMIN VLAN (yes), was up (yes) and could see somthing was connected (also yes).

I remembered that sometimes old server's BMC cards need a full power cycle to get going again, so at h1hwsey I powered it down and pulled both power cords for at least 30 secconds. When it powered back up I briefly went into BIOS to check the IPMI network settings (all good) and then booted. At this point the IPMI port for h1hwsey was operational again.

Back at h1hwsex I did the cords-out power cycle, which restored its IPMI as well.

I started the EX and EY HWS EPICS IOCs to get the EDC green again.

MY Weather Station

The power outage damaged the 24V Comtrol power suppy for both MY and EY. Erik found a spare PS in EE on Monday and got EY going. This afternoon I found a second spare PS in the MSR and got MY weather station going again.

H1 AOS - Comment to WHAM1 Passive Stack Optical Table Pre-Deinstall Measurements (WP 12442)

jason.oberling@ligo.org — Wed, 09 Apr 2025 17:03:17 -0700

Author: jason.oberling@ligo.org

Report ID: 83842

TJ O'Hanlon informed me via email that there indeed was an error in the x-axis coordinate at both LHO and LLO, due to the thickness of the septum between HAM1 and HAM2 not being taken into account, which had not been propagated to all of the SYS mechanical layout drawings (and some of the CAD files as well). I had completely forgotten about this, and explains why we had moved the WHAM1 passive stack monument LV25 further in the -X direction some time back in 2012; the first attached picture shows this (the clear cut out next to the existing monument was the old position of LV25 before we moved it). I went spelunking through my old 2012 emails to find some communication about this, but all I could find was an email chain re: LLO setting the LHAM6 support tubes and not being able to get them in the proper y-axis position. Dennis replied that this was due to the septum thickness and would apply to HAM1 and HAM6 at both sites, and that he would update E1200625 with the correct coordinates for all involved chambers. From E1200625 the x-axis coordinate of WHAM1 should be -22726.7 mm, so I have updated the PolyWorks project with this new, correct coordinate; this is shown in the 2nd attached picture.

From this I can now say that the -Y row of holes on the WHAM1 passive stack's optical table are ~2.56 mm too far in the -X direction. If we were to use the FARO to survey monument LV25 my guess is that would explain the 2.5 mm error, seeing as how nearby LV24 was also ~2.0 mm too far in -X direction. As stated in the main alog this difference doesn't exactly surprise me given the "monuments placed off of monuments placed off of monuments" situation we have here. The FARO was aligned to our X and Y axes using monuments PSI-1, PSI-2, PSI-6, and BTVE-1, so any error between these 1st and 2nd generation monuments and the 4th generation LV monuments will be measured by the FARO.

While I was at it I went ahead and applied the required transform for local to global coordinates. This is done by creating a new coordinate system and applying the requisite tilt of both the X and Y axes. The tilt must be entered in degrees and for the opposite axis. This is because our, for example, y-axis tilt angle w.r.t. local gravity is a rotation of the x-axis. Since PolyWorks works off of axis rotation, we enter the y-axis angle as an x-axis tilt (same for the x-axis angle). To get PolyWorks to correctly calculate the transform matrix both values should be entered as positive numbers (I'm not entirely sure why). The values to enter:

X-axis rotation: 0.0000125 µrad -> 0.0007162°
Y-axis rotation: 0.0006195 µrad -> 0.0354947°

The calculated transform matrix is shown in the 4th attached picture, which properly matches Table 10 in T980044 (note, the numbers in the transform matrix are in radians, even though I had to enter the rotations in degrees). To confirm this was correct I manually calculated the correct global z-axis coordinate using the formula in Section 2.3 of T0900340 for each bolt hole; the results were the same between my calculation and PolyWorks'. The final picture shows the bolt hole survey in the LHO global coordinate frame.

Images attached to this report

H1 SUS - Comment to CPY adjustment limited by PUM-level inter-chain earthquake stops

anthony.sanchez@ligo.org — Wed, 09 Apr 2025 16:52:47 -0700

Author: anthony.sanchez@ligo.org

Report ID: 83844

Relevent alog: https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=83838

H1 SUS - SUS ITMY_R0_OPTICALIGN OFFSET slider calibration attempt

anthony.sanchez@ligo.org — Wed, 09 Apr 2025 16:49:59 -0700

Author: anthony.sanchez@ligo.org

Report ID: 83838

There was an attempt to calibrate the sliders for the H1:SUS-ITMY_R0_OPTICALIGN_ P _OFFSET And also for Yaw.

Robert & Sheila were inside the vacuum chamber over by GV5 holding up a "Calibration sheet".
I was tasked to move the sliders back an forth.
H1:SUS-ITMY_R0_OPTICALIGN_P_OFFSET has a range from -410 to +410.
I set the ramp time to 10 seconds, and the stepsize to 880.
At 21:14 UTC I typed in the value to send the slider to -440.
I then took a singular step that took the slider from -440 to +440, and then took the slider back to -440 with a singular step.
This was repeated a few times.
I then changed the step size from 880 to 440 and set the slider to -220.
Then stepped from -220 to +220 with a singular step, and back to -220 again.

I then did a similar process again for H1:SUS-ITMY_R0_OPTICALIGN_Y_OFFSET which has a range from -610 to +610.
So the step size this time was 1220.
The slider was moved to -610 at 21:18 UTC.
The slider was then stepped over to +610 via a singular click of an arrow key. Then back down to -610 again with another click.
This was repeated once again.

The step size was then reduced to 610 , and the slider was moved to -305. We then stepped up from -305 to + 305 with a step.
the slider value was returned back to -305 and the process was repeated.

I assume that Robert was holding a laminated sheet of graphing paper that we could use as an absolute reference for this slider values to calibrate the beam movements.

Images attached to this report

H1 SEI - Passive stack optical table removed from HAM1, was tougher than expected.

jim.warner@ligo.org — Wed, 09 Apr 2025 16:48:14 -0700

Author: jim.warner@ligo.org

Report ID: 83843

Randy, Tyler, TJ,Oli,Corey, Mitch, Jim

Starting after lunch today, we launched on starting to disassemble the HAM1 passive stack. First we had to pull the L4Cs we installed IN the optical table. These proved difficult to remove, most of the screws could be removed with a long t-handle 3/16 allen key, but for the 2 vertical L4Cs on the +X side each one had one screw that was difficult to find a way to reach. Corey ended up removing the clamps from his, TJ painfully removed a final screw 1/8th a turn at a time. This took most of the afternoon.

While we chewed on that problem, we also tried pulling the pins holding the optical table to the mass stack. These also proved difficult, it seems like the pins may have been overtorqued. We ended up having to use a wiped down pair of vise grips to assist an awkwardly inserted screwdriver to break all 12 bolts free.

Once the L4Cs and optical table bolts were removed, pulling the table was simple: attach the lifting plate, pull up with the fork lift gently until the optical table popped free, then up and out of the chamber. The optical table is sitting on a pallet between HAM2 and HAM3, probably headed for recycling. Everything else is going to be bagged and tagged for somebody else's project.

Tomorrow we'll finish pulling the masses and support table.

Images attached to this report

H1 General - OPS Wednesday DAY shift summary

ryan.crouch@ligo.org — Wed, 09 Apr 2025 16:41:16 -0700

Author: ryan.crouch@ligo.org

Report ID: 83835

TITLE: 04/09 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: HAM6 turbo work completed, BSC8 work progressed, and HAM1s passive stack was cleared off, the cabling was removed, and the passive stack's tabletop is on a pallet.
LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
14:35	FAC	Nelly, Kim	LVEA	n	Tech clean (in at 14:20)	17:58
14:36	FAC	Randy	LVEA	n	Crane over YARM (in at 14:35)	14:49
15:10	VAC	Jordan	LVEA	n	Purge air checks	15:23
16:07	SLiC	Tony, Ibrahim, Sheila, Betsy, Robert	LVEA-BSC8	n	BSC8, ITMY CP	18:38
16:08	ISC	Camilla, Elenna, Oli, Rahul	LVEA-HAM1	n	HAM1 parts removal, Oli & Elenna out 18:30, Camilla 18:48	18:49
16:13	CDS	Fil, Marc, Corey	Opt Lab	n	HAM1 cable prep, corey out @ 1800UTC	19:42
16:24	Property	Christina	Mids	n	Pelican case check	16:44
16:39	SEI	Jim & Mitch	LVEA	N	HEPI actuators disconnect cont	18:44
16:41	VAC	Travis, Melina, Jordan	LVEA	N	HAM6 turbo	19:13
16:42	SPI	Jeff, Josh	Optics lab	N	SPI pickoff install prep	19:01
17:08	IAS	Jason	LVEA	N	FARO temperature troubleshooting	17:47
17:21	OPS	TJ	LVEA	N	Check for tooling	18:31
17:58	OPS	Jennie, Matt+2	LVEA	N	TOur for new fellows	18:20
17:59	FAC	Nelly	MidY	N	Tech clean	18:54
18:24	FAC	Richard	LVEA	N	Safety checks	18:36
18:54	FAC	Nelly	MidX	N	Tech clean	19:27
19:05	SPI	Jeff, Josh	Optics lab	LOCAL	SPI work	19:34
19:38	ISC	Camilla, Rahul	LVEA	N	HAM1 parts removal, Rahul out 20:42	20:54
19:43	ISC	Elenna	LVEA	N	Grab drawing by HAM1	19:47
19:43	ISC	Tj	LVEA	N	HAM1 work, platform stair removal	23:26
19:49	FAC	Randy	LVEA	N	HAM1 work, forklifting	22:00
19:59	CDS	Dave	MidX	N	Wind sensor, midy and ends after for various fixes	20:51
20:09	ISC	Corey	LVEA	N	HAM1 work	23:25
20:11	FAC	Richard	LVEA	N	Checks/Walkthrough, in and out	21:04
20:23	OPS	Oli	LVEA	N	Wrap bag and tag	23:26
20:23	ISC	Mitch, Jim	LVEA	N	HAM1 passive stack, Mitch out 23:20	23:26
20:44	VAC	Jordan, Melina	LVEA	N	HAM6 turbo work	22:33
20:47	EE	Fil, Marc	Optics Lab	Local	Measurements	?
21:02	ISC	Ibrahim, Robert, Sheila	LVEA	N	BSC8 ITMY work	22:28
21:09	ISC	Betsy	LVEA	N	Join BSC8 ITMY crew	22:36
21:24	FAC	Richard	LVEA	N	Steel toe shoe count	22:01
22:13	FAC	Tyler	LVEA	N	CHeck out HAM1 progress	22:28
22:25	FAC	Richard	LVEA	N	Safety checks	22:50
22:29	FAC	Tyler	LVEA	N	Quick check	23:20

JIM/MITCH - HAM1 Offload HEPI Setup, disconnect actuators (continued) DONE
HAM1 - ISC component (continued) (Camilla, Oli, Elenna, Rahul, TJ) DONE alog83836
MID Station forklift - Transport and Load in ISI de/Install fixtures, wipe down, crane into place ?
BSC1 (via BSC8) - CPY work starts - crew to map beams inside at spool (Betsy, Robert, Sheila, Tony) Partially done alog83841
Randy - Remove platforms from HAM1 DONE
HAM1 - Remove all cables form chamber DONE
HAM1 CRANE/FORKLIFT - SEI Stack removal Still in progress
RANDY - Crane 3IFO Flange crate over BT to first stop West Bay for later X-Arm traverse ?
HAM6 VAC - Move turbo from top to back door (continued) DONE alog83840

There were some high dust counts at BSC8 at 21:00 UTC but they cleared up after ~10 minutes, 1270 and 320 for 0.3 and 0.5 particles respectively.
The PSL anteroom had several red alarms of just over 100 counts but this is probably to be expected with the adjacent HAM1 work

H1 AOS - CPY adjustment limited by PUM-level inter-chain earthquake stops

robert.schofield@ligo.org — Wed, 09 Apr 2025 16:32:43 -0700

Author: robert.schofield@ligo.org

Report ID: 83841

Ibrahim, Tony, Betsy, Sheila, Robert

We tried adjusting the pitch of CPY to overlap the optical lever beam spot from the arm cavity side of CPY with the spot from the AR side of ITMY, but the PUM-level inter-chain earthquake stops limited our pitch adjustment. The figure shows that we reduced the distance between the spots we were trying to overlap by a factor of 0.56. If we are going to leave it this way, we should back off a little from this setting.

Non-image files attached to this report

Before-after-CPY-move.pdf

LHO VE - Replacement of HAM6 Turbopump

jordan.vanosky@ligo.org — Wed, 09 Apr 2025 16:18:49 -0700

Author: jordan.vanosky@ligo.org

Report ID: 83840

Travis, Melina, Jordan

Per the updated HAM6 VE drawing (D0901823), we moved the HAM6 turbopump and pump out spool from the top D7 flange to the -Y door BF3 port. The 12"CF ->10" CF adapter, gate valve, pump out spool and turbo pump were removed and replaced with a single 12"CF blank on the D7 flange. We also replaced the turbo with a 500 l/s Leybold maglev turbo compatible with the SS500 pump carts.

The turbo assembly (with GV closed) was pumped down and helium leak checked. Each joint sprayed with a 5s dwell of He, no signal observed above the leak detector background of 3.6E-10 Torr-l/s. Remaining chamberside flanges will be He leak checked during corner pumpdown.

Images attached to this report

H1 ISC - Comment to All ISC/SUS components removed from HAM1 table

jennifer.wright@ligo.org — Wed, 09 Apr 2025 16:15:55 -0700

Author: jennifer.wright@ligo.org

Report ID: 83839

Tagging EPO for pic.

EPO

H1 ISC - Comment to All ISC/SUS components removed from HAM1 table

rahul.kumar@ligo.org — Wed, 09 Apr 2025 15:27:15 -0700

Author: rahul.kumar@ligo.org

Report ID: 83837

Adding a picture of the HAM1 table after all the components were removed.

Images attached to this report

H1 ISC - All ISC/SUS components removed from HAM1 table

camilla.compton@ligo.org — Wed, 09 Apr 2025 15:00:23 -0700

Author: camilla.compton@ligo.org

Report ID: 83836

Rahul, Elenna, Oli, TJ, Camilla, Jim, Betsy. WP12419

Following yesterday's work 83820, this morning we removed all remaining ISC components on HAM1. Rahul removed RM1, RM2 and the SEI 10kg weights (bolts are in foil pouches with the weights).

Everything has been placed on a rack in the HAM1 cleanroom, labeled photo attached. The beamdumps are ordered as shown, BD17 and 18 are the largest plates (BD naming convention in D1000313 v17 Cartoon). Which pan each optic is in has been added to the D1000313 googledoc along with any optic serial numbers that could be read, our current working copy of the document is attached.

After lunch, TJ removed the platforms/stairs around HAM1 and Rahul, Jim and I removed all the ISC and SUS cables. All DB-25s were stored in foil in the ISC components rack (bottom shelf) and the RF cables have been given to Fil for rework.

SUS

Images attached to this report

Non-image files attached to this report

D1300313_Notes_9April2025.pdf

H1 SEI - Comment to Dial indicators added on -X of HAM1, 2/4 HEPI actuators disconnected

jim.warner@ligo.org — Wed, 09 Apr 2025 11:59:41 -0700

Author: jim.warner@ligo.org

Report ID: 83834

All 4 actuators are disconnected now, we'll move to passive stack de-install after lunch. Dial indicators we have move .002", but that could very well just be drift in my set up.

LHO VE - Wed CP1 Fill

david.barker@ligo.org — Wed, 09 Apr 2025 10:16:39 -0700

Author: david.barker@ligo.org

Report ID: 83832

Wed Apr 09 10:11:18 2025 INFO: Fill completed in 11min 14secs

Images attached to this report

H1 SUS - Take Two: SR3 M1 SUS comparison between all DOFs -- In-Air TFs Exports of DTT Templates Fixed

jeffrey.kissel@ligo.org — Wed, 09 Apr 2025 09:35:51 -0700

Author: jeffrey.kissel@ligo.org

Report ID: 83831

J. Kissel, B. Lantz, E. Bonilla, O. Patane Very alarmed but how *apparently* different the in-air vs. in-vac TFs for H1SUSSR3 were -- see original plots in LHO:83818, and alarmed commentary in LHO:83819 -- Brian suggested "are you *sure* you've plotted the same DOF to DOF comparison on some of these plots?" He was right. I re-exported both the 2024-08-01 in-air transfer function set and 2024-08-08 in-vacuum set from the DTT templates. The in-air TF's exported text files showed a diff with what was in the svn on the L, T, V, and Y drives. So, all the TFs that were "very interesting" in the above mentioned commentary were "very interesting" because they were comparing apples to oranges, and treating that orange as an apple. So, here, I attach the same comparison for SR3, but with the fixed in-air data set. D R I V E D O F L T V R P Y L -- meh nd meh eand YI R T meh -- meh eand meh meh E S V YI YI -- YI nd YI P R YI eand YI -- YI meh D O P eand VI YI meh -- meh F Y YI nd meh nd nd -- Recall the legend is VI = Very Interesting (and unmodeled); very different between vac and air. esVI = Modeled, but Still Very Interesting; very different between vac and air YI = Yes, Interesting. DC response magnitude is a bit different between vac and air, but not by much and all the resonances show up at roughly the same magnitude. meh = The resonant structure is different in magnitude, but probably just a difference in measurement coherence eand = The cross coupling is expected, and not different between air and vac. nd = Not Different (and unmodeled). The cross-coupling is there, but it doesn't change from air to vac. Thankfully, - there are WAY less "very interesting," only the T to P (page 22) remains. - the matrix is more symmetric, and - the changes between air and vac are LOT less dramatic. We'll continue to discuss.SEI, SUS

Non-image files attached to this report

allhltss_2025-04-09_H1SUSSR3_M1_AirvsVac_ALL_TFs.pdf

LHO VE - Morning Purge Air Checks 4-9-25

jordan.vanosky@ligo.org — Wed, 09 Apr 2025 09:24:39 -0700

Author: jordan.vanosky@ligo.org

Report ID: 83830

Morning dry air skid checks, water pump, kobelco, drying towers all nominal.

Dew point measurement at YBM in prep for BSC1/8 work, -42C

Images attached to this report

H1 CDS - Comment to MX weather station wind speed sensor not working

david.barker@ligo.org — Wed, 09 Apr 2025 08:46:02 -0700

Author: david.barker@ligo.org

Report ID: 83829

FRS33817

H1 CDS - MX weather station wind speed sensor not working

david.barker@ligo.org — Wed, 09 Apr 2025 08:37:25 -0700

Author: david.barker@ligo.org

Report ID: 83828

Starting around 22:13 Tue08apr2025 the MX weather station wind speed anemometer stopped recording. The other MX sensors, for example outside temperature, continue to run.

Attachment shows wind speed and temp for EX top row, and for MX bottom row.

Images attached to this report

H1 General - Ops Day Shift Start

oli.patane@ligo.org — Wed, 09 Apr 2025 07:40:03 -0700

Author: oli.patane@ligo.org

Report ID: 83827

TITLE: 04/09 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: MAINTENANCE
    Wind: 4mph Gusts, 2mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.21 μm/s
QUICK SUMMARY:

Plans for today:

JIM/MITCH - HAM1 Offload HEPI Setup, disconnect actuators (continued)
HAM1 - ISC component (continued) (Camilla, Oli, Elenna, Rahul, TJ)
MID Station forklift - Transport and Load in ISI de/Install fixtures, wipe down, crane into place
BSC1 (via BSC8) - CPY work starts - crew to map beams inside at spool (Betsy, Robert, Sheila, Tony)
Randy - Remove platforms from HAM1
HAM1 - Remove all cables form chamber
HAM1 CRANE/FORKLIFT - SEI Stack removal
RANDY - Crane 3IFO Flange crate over BT to first stop West Bay for later X-Arm traverse
HAM6 VAC - Move turbo from top to back door (continued)

LHO VE - Comment to 2025 April vent - VAC diary

jordan.vanosky@ligo.org — Tue, 08 Apr 2025 18:49:17 -0700

Author: jordan.vanosky@ligo.org

Report ID: 83826

Purge air dewpoint measured at YBM port of entry during BSC8 door removal. Dew point = -42C

Images attached to this report

LHO VE - 2025 April vent - VAC diary

travis.sadecki@ligo.org — Tue, 08 Apr 2025 18:24:57 -0700

Author: travis.sadecki@ligo.org

Report ID: 83825

Today's activities:

Y-manifold purge air header connected to purge valve. Purge air flow rate was adjusted according to removal state (door still bolted, bolts loosened, C3 cover on).
BSC8 -X (South) door was removed.
HAM6 turbo pump, reducer, and gate valve removed from top D7 port. Will be replaced with a blank.
Viewport removed from HAM6 -Y door, port BF2. Will be replaced by new Leybold turbo and reused reducer/GV.

H1 AOS - WHAM1 Passive Stack Optical Table Pre-Deinstall Measurements (WP 12442)

jason.oberling@ligo.org — Tue, 08 Apr 2025 18:16:00 -0700

Author: jason.oberling@ligo.org

Report ID: 83823

J. Oberling, R. Crouch

Today we took pre-deinstall measurements of the position of the optical table surface of the WHAM1 passive stack. The plan was to use the FARO to measure the coordinates of several bolt holes, using a threaded nest that locates the Spherically Mounted Retroreflector (SMR) precisely over the bolt hole, on both the +Y and -Y side of the chamber. This, unfortunately, did not happen in full due to the untimely death of the FARO's climate sensor (or the FARO's ability to read the climate sensor, we're hoping for the former). The FARO cannot function without this sensor as it relies on accurate measurements of the air temperature, relative humidity, and air pressure to feed into a model of the refractive index of air, which it needs to accurately calculate the SMR distance from the FARO. We did manage to get a few points measured before the sensor died. I've reached out to FARO tech support about getting a new climate sensor and should hear back from them tomorrow (they usually replay in 1 business day).

Summary

We were able to get measurements of 3 bolt holes, all in the furthest -Y line of bolt holes, and an old IAS monument from aLIGO install before the FARO's climate sensor died. The results are listed below under the Results heading. The most interesting thing here is there appears to be an error in WHAM1 placement in the x-axis, as the bolt holes we measured are all ~37.25 mm too far in the -X direction from nominal. We also set a scale on the wall across from the -Y door of the WHAM1 chamber that is registered to the current elevation of the optical table; placing an autolevel so it sights 150.0 mm on this scale (sighting the side of the scale with the 0.5 mm tick marks) places that autolevel 150.0 mm above the surface of the passive stack's optical table.

Details

We started on the -Y side of the WHAM1 chamber. The FARO was set with a good view of its alignment monuments and the passive stack's optical table. We ran through the startup checks and calibrations without much issue (we did see a return of the odd 'ADM Checks Failing' error, which had been absent for about 1 month, but it immediately went away and didn't come back when we performed a Go Home operation). FARO monuments F-CS026 through F-CS035, inclusive, were used to align the FARO to the LHO LVEA local coordinate system; the 2 standard deviation device position uncertainty after this alignment was 0.016 mm (PolyWorks does 100 Monte Carlo simulations of the device position). This complete, we started measuring.

First, as a quick test of the alignment we took a look at old IAS monument LV24. This monument was used to align the WHAM2 ISI during aLIGO install, and its nominal X,Y coordinates are [-20122.0, -3050.7] mm (there is no z-axis coordinate as we were not setting these in Z back then, a separate set of wall marks was used for z-axis alignment). The results are shown in the 1st attached picture; again, ignore the z-axis results as I had to enter something for the nominal or PolyWorks wouldn't accept the entry, so I rounded to the closest whole number (this isn't even the surface of the monument, it's the point 2" above it where the SMR was, due to use of the Hubbs Center Punch Nest (which has a 2" vertical offset when using a 1.5" SMR)). Knowing how we had to set these older monuments, since I'm one of the people that set them, I'm not entirely surprised by the X and Y deviations. The monuments we set for aLIGO install (the LV monuments) were placed w.r.t. a set of monuments used to align iLIGO, which themselves were placed w.r.t. the monuments used to install the vacuum equipment during facility construction (the PSI monuments), which themselves were placed w.r.t. the BTVE monuments which define the interface between the arm beam tubes and the LVEA vacuum equipment, which we then found errors in their coordinates during our alignment of the FARO during the O4a/b commisioning break in 2024. Not at all surprised that errors could have stacked up without notice over all of those monuments set off of monuments set off of monuments set off of... Also, take note of the x-axis coordinate of this monument, this will be important later.

We then set about taking measurements of the passive stack optical table. To map the bolt holes we measured we used an XY cartesian basis, assuming the bolt hole in the -X/-Y corner was the origin. We then proceeded to increment the number by the bolt hole (not distance), following the same XY axis layout used for the IFO. Using this scheme the bolt holes for the table corners were marked as:

-X/-Y: (0,0)
-X/+Y: (0,32)
+X/-Y: (36,0)
+X/+Y: (36,32)

We were able to get measurements for bolt holes (0,0), (14,0), and (25,0). We were in the process of measuring bolt hole (36,0) (the +X/-Y corner bolt hole) when the FARO's climate sensor died.

To get the coordinates for the bolt holes I used the .EASM file for WHAM1 with the passive stack configuration located at D0901821-v4. From the assembly, using eDrawings, I was able to get coordinates w.r.t. the chamber origin for the bolt holes we measured. Those were then added to the coordinates for the WHAM1 chamber, in the LVEA local coordinate system, to get nominal coordinates for the bolt holes. I also had to add 25.4 mm to the z-axis coordinates to account for the 1" offset of the nest we were using for the SMR; the center of the SMR sits 1" above the point being measured, so I needed to manually add that offset to the nominal z-axis coordinate of the bolt hole. For reference, according to D0901821 the global coordinates for WHAM1 are [-22692.0, 0.0, 0.0] mm; when converted to the LVEA local coordinate system (removing the 619.5 µrad downward tilt of the X-arm) this becomes [-22692.0, 0.0, +14.1]. The measurement results are shown in the 2nd attached picture. Notice those x-axis deviations? Remember the measurement we made of LV24? Clearly the FARO alignment is not 37 mm off, as the measurement of LV24 showed, so something is definitely up with the x-axis coordinate of the WHAM1 chamber (error in chamber placement? aLIGO WHAM1 is the iLIGO WHAM2 chamber, moved from its old location next to WHAM3).

Results

We can do some analysis of the numbers we have, although limited since we only have 3 points in a line. This really only applies to the furthest -Y line of bolt holes on the table, since we weren't able to get measurements of the +Y side to get a more full picture of where the table is sitting, but it's something. Position tolerances at install in 2012 were +/-3.0 mm in all axes.

X-axis position: Not much we can do here without knowing what the actual x-axis coordinate of WHAM1 is. It clearly isn't where the SYS drawings say it should be.
Y-axis position: ~0.41 mm +Y from nominal
Z-axis position: ~0.76 mm +Z from nominal
Pitch: ~99 µrad down
Yaw: ~83 µrad CCW

I do want to note that D0901821-v4 claims the table surface should be -187.8 mm in LVEA local coordinates (-201.9 mm in global), but this is not the number we used when installing the passive stack in 2012. In 2012 we used -185.9 mm local (-200.0 mm global), as can be seen in D0901821-v2. To compare our measurements to the install numbers I changed the nominal z-axis coordinate to match that of our install target (-185.9 + 25.4 mm SMR offset = -160.5 mm) and the results are shown in the final attached picture.

Wall Scale Registered to Current Table Surface Elevation

To finish, we set a scale on the -Y wall directly Crane East of the WHAM1 chamber and registered it to the current elevation of the passive stack's optical table. To do this we used a scale provided by Jim (the scale was in inches, with 0.01" tick marks) and an autolevel. We set the autolevel at a fixed elevation on the -Y side of the chamber. The scale was then placed at each corner of the optical table, starting with the -X/+Y corner, and the autolevel was used to sight the scale; only the scale was moved, the autolevel was fixed (rotated only to follow the scale, but not moved otherwise). We then averaged the 4 scale readings to get the table elevation, set the autolevel to this reading with the scale back at our starting point (we actually didn't have to move it, thankfully), and then set a scale on the wall using the autolevel. The 4 scale readings:

-X/-Y: 5.89"
-X/+Y: 5.90"
+X/-Y: 5.90"
+X/+Y: 5.91"

The average of the 4 readings is 5.9", and since the autolevel was already sighting 5.9" on our starting point at the -X/+Y corner we left it there. This may seem high, but we had to have the autolevel high enough that we could see over the various components mounted to the table surface. We then turned the autolevel and set a scale on the wall. This scale was in mm (since that's what we had), but this worked out OK. 5.9" is ~149.9 mm (149.86 mm to be exact), so we set the wall scale so it read ~149.9 mm when sighted through the autolevel. So a 150.0 mm reading on this scale (sighting the side with the 0.5 mm tick marks) is ~150.0 mm above the current position of the passive stack's optical table.

This closes LHO WP 12442.

SEI, SYS

Images attached to this report

H1 SEI - Dial indicators added on -X of HAM1, 2/4 HEPI actuators disconnected

jim.warner@ligo.org — Tue, 08 Apr 2025 17:01:37 -0700

Author: jim.warner@ligo.org

Report ID: 83824

This morning, we added dial indicators to the ends of the support tubes to monitor the support tube locations on the -X side. We had to remove a cable tray to get room to do this under the chamber. They are protected under the chamber, but there is a bunch of loose cabling on that side that could bump my set up. Unfortunately, we don't have access to the northside. Not quite sure how to track the support tube ends on the +X side when we float HEPI yet.

While Betsy and crew were pulling parts in chamber, Mitch and I were disconnecting actuators at the piers. Vertical actuators are quite difficult, access is very tight, going to be hard reconnecting them. Horizontal actuators are a lot easier, but we are adding .100" shims and bolts to protect the bellows and IPS, we lost a couple shims inside one of the actuators and it was a struggle to fish them out. We are adding wires to the shims going forward to prevent that mishap. We'll get the other 2 actuators tomorrow. So far dial indicators show we are still in the same spot as before disconnecting the actuators.

H1 ISC - Comment to First Half of HAM1 table cleared

camilla.compton@ligo.org — Tue, 08 Apr 2025 16:48:52 -0700

Author: camilla.compton@ligo.org

Report ID: 83822

Before we started, Betsy and I replaced the septum plate VP cover we had removed yesterday 83798.

Layout before: D1000313-v15

H1 ISC - First Half of HAM1 table cleared

elenna.capote@ligo.org — Tue, 08 Apr 2025 16:45:39 -0700

Author: elenna.capote@ligo.org

Report ID: 83820

[Betsy, Camilla, Elenna, Oli]

We cleared half of the HAM1 table today on the +y side. This cleared optics on the ALS and POP paths, and the first part of the optics on the REFL path. We carefully labeled each component, and Oli logged component and cable names with serial numbers. Betsy laid the components in clean pans lined with cleanroom cloths. The cables are still attached to the feedthroughs and were left lying at the bottom of the chamber.

Attached photos show cleared side of the table.

Before removing components, we reviewed the table layout after Ibrahim and TJ noticed some discrepancies between the solidworks drawing and the optic locations as depicted in Corey's pictures from yesterday. We confirmed that there are some dispcrepancies between the two. TJ has a more detailed report.

Images attached to this report

H1 General - Ops Day Shift End

oli.patane@ligo.org — Tue, 08 Apr 2025 16:38:09 -0700

Author: oli.patane@ligo.org

Report ID: 83821

TITLE: 04/08 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:

More vent work today. I was able to mark some things fully or partially done, but others I'm unaware of their current status

DONE          FAC - 2nd Cleaning BSC8
DONE    Investigate large shifts in trends of PRM and PR2 in YAW (83807, 83808)
DONE    IAS - HAM1 Stack table survey
PARTIALLY JIM/MITCH - HAM1 Offload HEPI Setup, disconnect actuators
PARTIALLY   ISC - HAM1 - ISC component removal
PARTIALLY   VAC/FAC - BSC8 Door Off - CRANE to Caddy
                       VAC - Start Feedthru Swap
                     EE - HAM4-5 Cable tray work - Ken, some Crane usage
                     IAS - HAM1 support tube ends?

LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
14:44	FAC	Kim, Nelly	LVEA	n	Tech clean (HAM1, restock)	17:26
14:56	FAC	Eric	HAM Shack	n	Annual maintenance	16:38
15:10		Betsy	LVEA	n	Taking to FAC	15:25
15:23	VAC	Jordan	LVEA	N	Dew point check	15:36
15:34	IAS	Jason, RyanC	LVEA	n	FAROing	18:57
15:51	VAC	Jordan, Melina	EX	n	Checking on ion pump	16:22
15:52		Betsy	OpticsLab	n	Prepping to recrimp cables	16:55
15:53	FAC	Tyler	LVEA, HAM Shack	n	Checking on things	19:07
16:25	EE	Marc	CER	n	Grabbing label maker	16:35
16:58		Corey, Mitchell	MY	n	Grabbing tooling	17:28
17:01	SUS	Betsy	LVEA	N	BSC8 Dust Count Check	17:20
17:02	FAC	Chris, Pest Control	LVEA	n	Pest control	18:06
17:03		TJ	Mech Room	n	Checking out dust monitors	17:10
17:08	ISI	Jim	LVEA	n	Checking if HAM1 is ready	17:45
17:12		TJ	LVEA	n	Checking dust monitor	17:44
17:50	FAC	Kim, Nellie	EX	N	Technical cleaning	18:43
17:54	SEI	Jim, Mitchell	LVEA	n	HAM1 work	18:01
18:00	VAC	Jordan, Melina, Travis	LVEA	n	Start removal of HAM6 turbo pump	19:16
18:01		Mitchell, Jim	HAM Shack	n	Looking for parts	18:15
18:06	FAC	Chris	LVEA	N	Equipment check	18:57
18:12	PEM	Robert	LVEA	n	Talking to VAC	18:34
18:13		TJ	LVEA	N	Dust monitor test	18:24
18:15	SUS	Jim, Mitchell	LVEA	N	HEPI Offload	19:37
18:26	ISC	Betsy, Camilla	LVEA	n	Prepping for stuff removal at HAM1	19:15
19:07		Josh, Jeff, +2	LVEA	n	Tour	19:46
19:42	FAC	Travis, Jordan, Randy	LVEA	N	BSC8 Door move	00:19
20:18	ISC	Betsy, Elenna, Camilla	LVEA	n	Checking HAM1 layout discrepencies	23:20
20:25		Richard	LVEA	n	Walkabout	22:28
20:52	FAC	Tyler, Alpine roofing	EY	n	Looking at roof	21:44
20:58	EE	Marc	CER	n	labeling	21:44
20:59		Mitchell, Jim	LVEA	n	HAM1 feedthrough	23:27
21:42		TJ	LVEA	n	Talking about discrepencies	21:58
22:01	VAC	Travis	MX/MY	N	Conflat blank	22:29
22:04	FAC	Ryan C	LVEA	N	Dust monitor check	22:38
22:29		Oli	LVEA	N	HAM1 deinstall help	23:20
22:30	VAC	Travis	LVEA	N	Turbo Swap	00:30
22:30	FAC	Richard	LVEA	N	Walkabout + Headcount	22:44
22:49	FAC	Tyler, Water contractor	Water Tank	N	Continuing potable water restoration work	00:49
23:35		RyanC	LVEA	n	Checking on dust monitor	00:05

H1 PEM - Dust monitor trend monthly - FAMIS

ryan.crouch@ligo.org — Tue, 08 Apr 2025 16:19:10 -0700

Author: ryan.crouch@ligo.org

Report ID: 83817

Closes FAMIS37251

There's some known issues right now with the dust monitors. We can still see LAB1 not writting to the network, EY died for about a day, LVEA5 not writting anything for a few days, TJ swapped this one today with one from staging. The counts were not exactly as expected across both particle sizes, so I'm going to test this one a little more.

I brought LVEA5 over to LVEA10 in the biergarten and tested them side by side and saw similar results, I also did the zero count test on LVEA5 which it passed.

Images attached to this report

H1 SUS - Comment to SR3 M1 SUS comparison between all DOFs

jeffrey.kissel@ligo.org — Tue, 08 Apr 2025 15:32:59 -0700

Author: jeffrey.kissel@ligo.org

Report ID: 83819

Calling out the "interesting" off-diagonal elements: D R I V E D O F L T V R P Y L -- nc nc meh eand YI R T nc -- YI eand nc meh E S V meh YI -- meh nc YI P R VI esVI VI -- YI VI D O P esVI VI YI meh -- YI F Y YI nc nc nc nc -- Here's the legend to the matrix, in order of "interesting": VI = Very Interesting (and unmodeled); very different between vac and air. esVI = Modeled, but Still Very Interesting; very different between vac and air YI = Yes, Interesting. DC response magnitude is a bit different between vac and air, but not by much and all the resonances show up at roughly the same magnitude. meh = The resonant structure is different in magnitude, but probably just a difference in measurement coherence eand = The cross coupling is expected, and not different between air and vac. nd = Not Different (and unmodeled). The cross-coupling is there, but it doesn't change from air to vac. I've bolded everything above "meh" to help guide the eye. Recapping in a different way, because the plots are merged in a really funky order, VI = L to R (pg 14), T to P (pg 22), Y to R (pg 33) esVI = T to R (pg 16) L to P (pg 20) YI = L to Y (pg 28), Y to L (pg 27), T to V (pg 12), V to T (pg 11), V to P (pg 24), P to R (pg 25), Y to V (pg 31), Y to P (pg 35) What a mess! The matrix of interesting changes is NOT symmetric across the diagonal The matrix has unmodeled cross-coupling that *changes* between air and vac For the elements that are supposed to be there, (like L to P / P to L and T to R / R to T), the cross coupling different between air and vacuum. For some elements, the cross-coupling is *dramatically worse* at *vac* than it is at air. Why is there yaw to roll coupling, and why is it changing between air and vacuum?? There's clearly more going on here than just OSEM sensor miscalibration that the Stanford team found with PR3 data in LHO:83605. These measurements are a mere 8 days apart! The plan *was* to use SR3 as a proxy during the vent to test out the OSEM estimator algorithm they were using to improve yaw, but ... with this much different between air and vac, I'm not so sure the in-air SR3 measurements to inform an estimator to be used at vacuum.CSWG, SEI, SYS

H1 SUS - SR3 M1 SUS comparison between all DOFs

oli.patane@ligo.org — Tue, 08 Apr 2025 14:23:04 -0700

Author: oli.patane@ligo.org

Report ID: 83818

Jeff asked me to plot a comparison for SR3 M1 between all degrees of freedom comparing it in vacuum versus in air. I've plotted the last two measurements taken for SR3 from last August at the end of the OFI vent. One measurement was taken in air, and the other was taken in vacuum The pressure for the in vacuum measurement wasn't all the way down to our nominal, but as Jeff said in his alog at the time when we were running these measurements: "most of the molecules are out of the chamber that would contribute to buoyancy, so the SUS are at the position they will be in observing-level vacuum" (79513).

Non-image files attached to this report

allhltss_2025-04-08_H1SUSSR3_M1_AirvsVac_ALL_TFs.pdf

H1 General - Comment to HAM1 BEFORE SEI De-install / ISI Install Photos + Contamination Control Tasks

jeffrey.kissel@ligo.org — Tue, 08 Apr 2025 13:21:53 -0700

Author: jeffrey.kissel@ligo.org

Report ID: 83816

Tagging ISC, SUS, SYS, and SEI. Rest in power HAM1 Stack!ISC, SEI, SUS, SYS

H1 SUS - Comment to Recovery from 2025-04-06 Power Outage: +18V DC Power Supply to SUS-C5 ITMY/ITMX/BS Rack Trips, ITMY PUM OSEM SatAmp Fails; Replaced Both +/-18 V Power Supplies and Replaced ITMY PUM OSEM SatAmp

jeffrey.kissel@ligo.org — Tue, 08 Apr 2025 13:20:52 -0700

Author: jeffrey.kissel@ligo.org

Report ID: 83810

And now... the rest of the story. Upon recovery of the suspensions yesterday, we noticed that all the top-mass OSEM sensor values for ITMX, ITMY, and BS were low, *all* scattered from +2000 to +6000 [cts]. They typically should be typically sitting at ~half the ADC range, or ~15000 [cts]; see ~5 day trend of the top mass (main chain, M0) OSEMs for H1SUSBS M1,ITMX M0, and H1SUSITMY M0. The trends are labeled with all that has happen in the past 5 days. The corner was vented on Apr 4 / Friday, so that changes the physical position of the suspensions and the OSEMs see it. At the power outage on Apr 6, you can see a much different, much more drastic change. Investigations are rapid fire during these power outages, with ideas and guesses for what's wrong are flying everywhere. The one that ended up having fruit was that Dave mentioned that it looked like "they've lost a [+/-18V differential voltage] rail or something," -- where he's thinking about the old 2011 problem LLO:1857 where - There's a SCSI cable that connects the SCSI ports of a given AA chassis to the SCSI port of the corresponding ADC adapter card on the back of any IO chassis - The ADC Adapter Card 's port has very small, male pins that can be easy bent if one's not careful during the connection of the cable. - Sometimes, these male pins get bent in such a way that the (rather sharp) pin stabs into the plastic of the connecter, rather than into the conductive socket of the cable. Thus, (typically) one leg, of one differential channel is floating, and this manifests digitally in that it creates an *exact* -4300 ct (negative 4300 ct) offset that is stable and not noisy. - (as a side note, this issue was insidious: once one bent male pin on the ADC adapter card was bent, and mashed into the SCSI cable, that *SCSI* cable was now molded to the *bent* pin, and plugging it in to *other* adapter cards would bend previously unbent pins, *propagating* the problem.) Obviously this wasn't happening to *all* the OSEMs on three suspensions without anyone touching any cables, but it gave us enough clue to go out to the racks. Another major clue -- the signal processing electronics for ITMX, ITMY and BS are all in the same rack -- SUS-C5 in the CER. Upon visiting the racks, we found, indeed, that all the chassis in SUS-C5 -- the coil drivers, TOP (D1001782), UIM (D0902668) and PUM (D0902668) -- had their "-15 V" power supply indicator light OFF; see FRONT and BACK pictures of SUS-C5. Remember several quirks of the system that help us realize what's happened (and looking at the last page of ITM/BS wiring diagram, D1100022 as your visual aide): (1) For aLIGO "UK" suspensions -- the OSEM *sensors'* PD satellite amplifiers (sat amps, located out in the LVEA within the biergarten) that live out in the LVEA field racks are powered by the coil drivers to which their OSEM *coil actuators* are connected. So, when the SUS-C5 coil drivers lost a differential power rail, that makes both the coils and the sensors of the OSEM behave strangely (as typical with LIGO differential electronics: not "completely off" just "what the heck is that?"). (2) Just as an extra fun gotcha, all of the UK coil drivers back panels are *labeled incorrectly* so that the +15V supply voltage indicator LED is labeled "-15" and the -15V supply is labeled "+15". So, this is why the obviously positive 18V coming from the rack's power rail is off, but the "+15" indicator light is on an happy. #facepalm (3) The AA Chassis and Binary IO for these SUS live in the adjacent SUS-C6 rack; it's + and - 18V DC power supply (separate and different from the supplies for the SUS-C5 rack) came up fine without any over-current trip. Similarly the IO chassis, which *do* live in SUS-C5, are powered by a separate single-leg +24V from another DC power supply, also coming up fine without over-current trip. So, we had a totally normal digital readback of the odd electronics behavior. (4) Also note, at this point, we had not yet untripped the Independent Software Watch Dog, and the QUAD's Hardware Watchdog had completely tripped. So, if you "turn on the damping loops" it looks like nothing's wrong; at first glance, it might *look* like there's drive going out to the suspensions because you see live and moving MASTER_OUT channels and USER MODEL DAC output, missing that there's no IOP MODEL DAC output. and it might *look* like the suspensions are moving as a result because there are some non-zero signals coming into on OSEMINF banks and they're moving around, so that means the damping loops are doing what they do and blindly taking this sensor signal, filtering it per normal, and sending a control signal out. Oi. So, anyways, back to the racks -- while *I* got distracted inventorying *all* the racks to see what else failed, and mapping all the blinking lights in *all* the DC power supplies (which, I learned, are a red herring) -- Richard flipped on the +18V power supply in VDC-C1 U23, identifying quickly that it had over-current-tripped when the site regained power. See the "before" picture of VDC-C1 U23 what it looks like tripped -- the "left" (in this "front of the rack" view) power supply's power switch on the lower left is in the OFF position, and voltage and current read zero. Turning the +18V power supply on *briefly* restored *all* OSEM readbacks, for a few minutes. And then the same supply, VDC-C1 U23, over-current tripped again. So Richard and I turned off all the coil drivers in SUS-R5 via their rocker switches, turned on the VDC-C1 U23 left +18V power supply again, then one-by-one powered on the coil drivers in SUS-C5 with Richard watching the current draw on the VDC-C1 U23 power supply. Interesting for later: when we turned on the ITMY PUM driver, he shouted down "whup! Saw that one!" With this slow turn on, the power supply did not trip and power to the SUS-R5 held, so we left it ...for a while. Richard and I identified that this rack's +18V and -18V power supplies had *not* yet had their fans upgraded per IIET:33728. Given that it was functioning again and having other fish to fry, we elected to not *yet* to replace the power supplies. Then ~10-15 minutes later, the same supply, VDC-C1 U23, over-current tripped again, again . So, Marc and I went forward with replacing the power supplies. Before replacement, with the power to all the SUS-C5 rack's coil drivers off again, we measured the output voltage of both supplies via DVM: +19.35 and -18.7 [V_DC]. Then we turned off both former power supplies and swapped in the replacements (see serial numbers quoted in the main aLOG); see "after" picture. Not knowing better we set the supplies to output to a symmetric +/-18.71 [V_DC] as measured by DVM. Upon initial power turn on with no SUS-R5 coil drivers on, we measured the voltage from an unused 3W3 power spigot of the SUS-R5 +/-18 V power rail, and measured a balanced +/-18.6 [V_DC]. Similar to Richard and I earlier, I individually turned on each coil driver at SUS-C5 while Marc watched the current draw at the VDC-C1 rack. Again, once we got the ITMY PUM driver we saw a large jump in current draw. (this is one of the "important later") I remeasured the SUS-R5 power rail, and the voltage on positive leg had dropped to +18.06 [V_DC]. So, we slowly increased the requested voltage from the power supply to achieve +18.5 [V_DC] again at the SUS-R5 power rail. This required 19.34 [V_DC] at the power supply. Welp -- I guess whomever had set the +18V power supply to +19.35 [V_DC] some time in the past had come across this issue before. Finishing up at the supplies, we restored power / turned to all the remaining coil drivers had watched it for another bit. No more over-current trips. GOOD! ... but we're not done! ... upon returning to the ITMY MEDM overview screen on a CDS laptop still standing by the rack, we saw the "ROCKER SWITCH DEATH" or "COIL DRIVER DEATH" warning lights randomly and quickly flashing around *both* the L1 UIM and the L2 PUM COILOUTFs. Oli reported the same thing from the control room. However, both those coil drivers power rail lights looked fine and the rocker switches had not tripped. Reminding myself that these indicator lights are actually watching the OSEM sensor readbacks; if the sensors are some small threshold around zero, then the warning light flashes. This was a crude remote indicator of whether the coil driver itself had over-current tripped because again, the sensors are powered by the coil driver, so if the sensors are zero then there's a good chance the coil driver if off. But in this case we're staring at the coil driver and it reports good health and no rocker switch over-current trip. However we see the L2 PUM OSEMs were rapidly glitching between "normal signal" of ~15000 [cts] and a "noisy zero" around 0 [ct] -- hence the red, erratic (and red herring) warning lights. Richard's instincts were "maybe the sat amp has gone in to oscillations" a la 2015's problem solved by an ECR (see IIET:4628), and suggest power cycling the sat amp. Of course, these UK satamps () are another design without a power switch, so a "power cycle" means disconnecting and reconnecting the cabling to/from the coil driver that powers it at the satamp. So, Marc and I headed out to SUS-R5 in the biergarten, and found that only ITMY PUM satamp had all 4 channels' fault lights on and red. See FAULT picture. Powering off / powering on (unplugging, replugging) the sat amp did not resolve the fault lights nor the signal glitching. We replaced the sat amp with a in-hand spare and fault lights did NOT light up and signals looked excellent. No noise, and the DC values were restored to their pre-power-outage values. See OK picture. So, we're not sure *really* what the failure mode was for this satamp, but (a) we suspect it was a victim of the current surges and unequal power rails over the course of re-powering the SUS-C5 rack, which contains the ITMY PUM coil driver that drew a lot of current upon power up, which powers this sat-amp (this is the other of the "important later"); and (b) we had a spare and it works, so we've moved on with post-mortem to come later. So -- for all that -- the short answer summary is as the main aLOG says: - The VDC-C1 U23 "left" +18V DC power supply for the SUS-R5 rack (and for specifically the ITMX, ITMY, and BS coil drivers) over-current tripped several times over the course of power restoration, leading us to - Replace both +18V and -18V power supplies that were already stressed and planned to be swapped in the fullness of time, and - We swapped a sat-amp that did not survive the current surges and unequal power rail turn-ons of the power outage recovery and subsequent investigations. Oi!CDS, SUS

Images attached to this report

H1 General - HAM1 BEFORE SEI De-install / ISI Install Photos + Contamination Control Tasks

corey.gray@ligo.org — Tue, 08 Apr 2025 13:04:59 -0700

Author: corey.gray@ligo.org

Report ID: 83790

HAM1 Before Photos: (HAM1 chamber open just under 90min for this activity)

This morning before the deinstall activities begin, took the opportunity to photo document the HAM1 optical layout. Keita requested I take photos to record the layout wrt to the iLIGO bolt pattern, because rough alignment of optical components on the new SEI ISI for HAM1 will be done utilizing the bolt patterns of the Optics Tables; so I took a few more photos than normal (top view and angled with a focus on the REFL path). Took large photos with the Canon 60D DSLR camera as well as my camera phone.

The photos are being populated in this Google Drive folder: https://drive.google.com/drive/folders/1yDKp7aByA_TYJ12c8j8BnZM_pd1Q2DBZ?usp=sharing

Naming each photo referencing an updated layout Camilla Compton made which labels all beam dumps, but I also had to use an older layout to preserve naming since the layout on HAM1 currently looks like D1000313v16 (which is also referenced for naming the photos).

The above folder has the Canon photos, and I'll be adding the camera phone images next.

Contamination Control Notes:

Dust Monitor on the West side of HAM1 had 0.0 counts (0.3+0.5um) BEFORE the work started and AFTER the work was done the counts were under 100.0 counts (0.3+0.5um).
Travis touched up the Purge Air a little before the covers were rolled down.
The Contamination Control wafer roughly in the middle of the table was pulled out and Betsy encapsulated in a container.

EPO

Images attached to this report

LHO FMCS - Mitsubishi A/C low ambient hood enabling

eric.otterman@ligo.org — Tue, 08 Apr 2025 12:47:48 -0700

Author: eric.otterman@ligo.org

Report ID: 83815

The Mitsubishi condensing units at the H2 and MSR have had their low ambient hoods enabled for the season. Due to the large ambient temperature swings that occur in Spring, this may cause less uniform temperature trending in the MSR until the overnight temperatures moderate.

LHO FMCS - FCES annual air handler maintenance

eric.otterman@ligo.org — Tue, 08 Apr 2025 12:42:47 -0700

Author: eric.otterman@ligo.org

Report ID: 83814

The annual air handler maintenance was done at the FCES this morning. No issues have been observed since.

LHO General - Comment to Water Leak Repair

corey.gray@ligo.org — Tue, 08 Apr 2025 11:54:13 -0700

Author: corey.gray@ligo.org

Report ID: 83813

Tagging EPO for the photos!

EPO

H1 CDS - CDS Recovery Status

david.barker@ligo.org — Tue, 08 Apr 2025 11:41:43 -0700

Author: david.barker@ligo.org

Report ID: 83812

The DAQ's EDC is green again. Erik and Camilla started the HWS EX and EY IOCs which were the last needed to complete the set.

Daniel and Patrick confirmed that the two Beckhoff terminals lost at EX are the AOS baffle PDs, which are not immediately needed but will be needed to return to O4. For now I have "greened up" the CDS overview by configuring DEV4 to expect 125 terminals of 127 total.

To remind us that DEV4 is in a degraded state, and that DEV1 was degraded in Dec 2024 when it lost its illuminators, these are shown with a darker green block.

Images attached to this report

H1 CDS - Remaining Beckhoff errors

patrick.thomas@ligo.org — Tue, 08 Apr 2025 11:13:06 -0700

Author: patrick.thomas@ligo.org

Report ID: 83811

Attached are screenshots showing the terminals that are currently in error. The h1ecatc1 computer froze up part way through looking at these with remote desktop. I put a terminal on it and physically power cycled it.

Images attached to this report

LHO VE - Tue CP1 Fill

david.barker@ligo.org — Tue, 08 Apr 2025 10:30:27 -0700

Author: david.barker@ligo.org

Report ID: 83809

Tue Apr 08 10:10:05 2025 INFO: Fill completed in 10min 1secs

Images attached to this report

H1 SUS - Comment to Power power outage OSEM recovery / Offset check

oli.patane@ligo.org — Tue, 08 Apr 2025 09:47:39 -0700

Author: oli.patane@ligo.org

Report ID: 83808

I checked the rest of the optics and verified that they all got put back to point where they were pointing before the power outage. I've also used one of the horizontal cursors to mark where the optic was at the "good DRMI time", and the other cursor marks where the optic is currently.

Images attached to this report

H1 SUS - Comment to Power power outage OSEM recovery / Offset check

camilla.compton@ligo.org — Tue, 08 Apr 2025 09:35:42 -0700

Author: camilla.compton@ligo.org

Report ID: 83807

Betsy, Oli, Camilla

The complete story:

Ryan S had found a "good DRMI time" were all optics were in thier aligned state beofre HEPI lockign or venting: 1427541769 gps.

We had planned to go back to this time, but there was then some confusion about whether we wanted a time with the HEPIs locked or not and the team decided to go back to the time directly before the power outage, so that there is a typo is Ryan's original alog.

Everything actually got put back to a time before the power outage, when all suspensions were in the ALIGNED guardian state, (e.g. Sunday 6th April ~16:00UTC or times around then). However some of the ISI's were tripped at that time: HAM2, HAM7, BSC1, BSC2, BSC3, OPs overview attached.

As we went and checked the IMC alignment yesterday 83794 (and saw flashes on IM4_TRANS suggesting MCs and IM1,2,3 are good), we do not want to move the alignment again so are staying with everything at this "before power outage time"...for better or worse.

We rechecked that everything was put back to this time, looking at the M1 DAMP channels for each optic, e.g. H1:SUS-OM1_M1_DAMP_{P,Y}_INMON:

OM1,2,3, ZM6
SRM,2,3
IM1,2,3,4
Quads, BS, TMS
- Found that ETMX was 30urad off, same with ITMY Yaw, so Oli readjusted. All others were left as is.
Oli checked all other optics which were fine, within a few urad.

For each ndscope, 1st t-cursor on originally "good DRMI time" we had planned to go back to, second t-cursor on time we went back to.

ISC

Images attached to this report

LHO VE - Morning Purge Air Checks

jordan.vanosky@ligo.org — Tue, 08 Apr 2025 08:49:35 -0700

Author: jordan.vanosky@ligo.org

Report ID: 83806

Morning inspection of Kobelco, water pump and drying towers completed, all nominal.

Purge air dewpoint prior to in chamber work, measured at HAM1 port of entry was -42 C. Measurement will be repeated at YBM prior to BSC8 -X door removal.

Images attached to this report

H1 SUS - Comment to Power power outage OSEM recovery / Offset check

camilla.compton@ligo.org — Tue, 08 Apr 2025 08:37:11 -0700

Author: camilla.compton@ligo.org

Report ID: 83805

HAM7/8 suspensions was brought back, details in 83774.

H1 PEM - Comment to HAM1 dust monitor weekend trend

ryan.crouch@ligo.org — Tue, 08 Apr 2025 08:13:59 -0700

Author: ryan.crouch@ligo.org

Report ID: 83804

The EY dust monitor came back overnight.

LHO General - Water Leak Repair

tyler.guidry@ligo.org — Tue, 08 Apr 2025 08:08:17 -0700

Author: tyler.guidry@ligo.org

Report ID: 83803

C&E Trenching arrived yesterday morning and began work on uncovering/locating the potable water leak. Ultimately, the leak was in very close proximity to where I first noticed the persistently wet pavement. It was directly beneath secondary high voltage lines that feed the chiller yard among other things. The cause of the leak ended up being a small crack impregnated with a rock near a smashed/deformed section of pipe. There is no clear explanation as to how the pipe was damaged in the first place. The trenching team suggested that the pipe may have been damaged just before/during installation. Interestingly enough, this section of pipe was found to have two prior repairs made to it as seen in the photo with the two pipe couplers right next to each other. Based on the date printed on the pipe, these repairs were made during construction some time in 96'. Important note: with the potable supply valved out at the water room, I replenished the holding tank to a level of 57.8" read at FMCS. Once the pipe repair had been made, I reintroduced the potable supply and the tank level fell to 52.5". In conjunction with this, the Magemter gauge prior to line repair read xx6171 gallons. Post repair the gauge read xx6460. However, I don't have much confidence in the Magmeter gauge readout in this scenario as the line turbulence causes some egregious (-250gpm+) reverse flow readings while the line recharges. After repair, and keeping staff water usage suspended, I held the line pressure at some 80psi for 30 minutes or so and observed no leaks. There were also no drops in system pressure nor was there any flow readout at the magmeter gauge - both important and reassuring improvements. R. McCarthy T. Guidry

Images attached to this report

H1 SEI - ISI CPS Noise Spectra Check Weekly FAMIS

oli.patane@ligo.org — Tue, 08 Apr 2025 07:57:02 -0700

Author: oli.patane@ligo.org

Report ID: 83802

Closes FAMIS#26038, last checked 83718

Just like last week, everything is elevated due to the vent.

Non-image files attached to this report

CPS_spectra_07:53-04_08_2025.pdf

H1 General - Ops Day Shift Start

oli.patane@ligo.org — Tue, 08 Apr 2025 07:40:38 -0700

Author: oli.patane@ligo.org

Report ID: 83801

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: 18mph Gusts, 15mph 3min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.23 μm/s
QUICK SUMMARY:

Plans for today:

FAC - 2nd Cleaning BSC8
Investigate large shifts in trends of PRM and PR2 in YAW - see MON alog of realignment restoration work
IAS - HAM1 Stack table survey
IAS - HAM1 support tube ends?
JIM/MITCH - HAM1 Offload HEPI Setup, disconnect actuators
ISC - HAM1 - ISC component removal
VAC/FAC - BSC8 Door Off - CRANE to Caddy
VAC - Start Feedthru Swap
EE - HAM4-5 Cable tray work - Ken, some Crane usage

H1 CDS - Workstations updated

erik.vonreis@ligo.org — Tue, 08 Apr 2025 06:33:43 -0700

Author: erik.vonreis@ligo.org

Report ID: 83800

Workstations were updated and rebooted. This was an OS packages update. Conda packages were not updated.

LHO VE - Installation of 1000AMU RGA Assembly

jordan.vanosky@ligo.org — Mon, 07 Apr 2025 17:14:05 -0700

Author: jordan.vanosky@ligo.org

Report ID: 83799

Travis, Melina, Jordan

Today we were able to install the assembly for the new 1000AMU RGA. (D2300253). This is located on the Y-beam manifold near BSC8.

The assembly had been previously built in the staging building and the final 8"CF connection to the gate valve on the YBM was done. There is a temporary support stand currently attached, a more permanent support and bump protection cage will be installed later.

The assembly was helium leak checked at all joints, He dwell of ~5 seconds per joint. No He signal was seen above the HLD background ~1.7E-10 Torr-l/s.

Assembly will continue to pumpdown overnight on a turbo, then will transition to the assembly 10 l/s diode ion pump.

Images attached to this report

H1 IOO - Comment to Found PSL beam through IMC trans and refl viewports on HAM2

keita.kawabe@ligo.org — Mon, 07 Apr 2025 16:43:49 -0700

Author: keita.kawabe@ligo.org

Report ID: 83797

During this work, PSL waveplate rotetor was set to 200mW and then de-energized. I haven't re-energized as we don't need higher power for a long time.

PSL laser pipe was temporarily opened for this task and was closed after.

Attached video shows the flashing of the beam in MC TRANS path. The alignment from the PSL through the IMC is not crazy. Any further refinement should be done after we start pumping down the corner before we install HAM1 optics.

Non-image files attached to this report

PXL_20250407_225725069TS~3.mp4

H1 SYS - Comment to VENT ACTIVITY STAT mid boot fests

camilla.compton@ligo.org — Mon, 07 Apr 2025 16:43:20 -0700

Author: camilla.compton@ligo.org

Report ID: 83798

Betsy and I also removed the septum plate VP cover to allow the PSL beam into HAM2 for alignment check work 83794, it was placed on HAM1.

H1 General - Ops Day Shift End

oli.patane@ligo.org — Mon, 07 Apr 2025 16:35:31 -0700

Author: oli.patane@ligo.org

Report ID: 83796

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:

There was some good vent progress made today, but a good chunk of the day was just working on recovering all systems from last night's power outage.

Vent progress made today:
VAC - 1000 AMU RGA WORK - YBT
HAM1 - Contam Control checks
COREY - HAM1 Pictures
ISC - MC Flashing Peek to confirm MC and PSL PZT aligned
FAC - Clean BSC8 door and area
HAM1 - COAX Cable length measurement (disconnect at component)

Overview of biggest issues caused by the outage:
- Power supply for h1susb123SUS C5 (SUS C5) tripped off (83787)
    - ITMs and BS OSEM counts were all sitting very low around 3000. Power supply was flipped back on without turning coil drivers off, causing it to trip again. OSEM counts returned to normal for ITMX and BS, but ITMY coil driver filter banks for M0, L1, L2 were flashing ROCKER SWITCH DEATH. ROCKER SWITCH DEATH means that all OSEM values for that stage are less than 5.
    - Initially remedied by turning coil drivers and power supply off, then power supply back on and then turning coil drivers back on one at a time.
    - 17:46 ROCKER SWITCH DEATH started flashing again for ITMY. ITMs and BS all taken to SAFE, power supply for SUS C5 swapped. Checked before swapping - power supply was still on and had not tripped.
    - Tried power cycling the satamp - didn't work
    - SatAmp replacement worked
- ISI ITMY corner1 interface chassis power regulator was blown (83781)
    - Swapped with a spare
- Timing error for Corner A fanouts, digital port 13, analog port 14 (83777)
    - Power cycled timing comparator and it came back fine
- Timing error for Master, digital port 8, analog port 9 -
- PSL down due to Beckoff chassis off (83785)

LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
14:30	FAC	Kim, Nelly	EY	n	Tech clean	15:23
15:26	EE	Jeff	CER	n	Checking power supply	15:46
15:41		Camilla	CER	n	Checking on Jeff	15:46
15:44	VAC	Travis, Jordan	LVEA	n	BSC8 annulus vent	16:26
15:47		Jeff, Jim	CER	n	Checking racks again	15:58
15:50	FAC	Kim, Nelly	LVEA	n	Tech clean	19:51
16:06	PSL	RyanS	LVEA	n	Power cycling PSL chassis	16:51
16:09	EE	Richard	CER	n	Turning power supply back on	16:09
16:11		Jeff, Richard	CER	n	Cycling coil drivers	16:23
16:20	FAC	C+U	water tower	n	Excavating to find leak	18:20
16:29	EE	Marc	CER	n	ISI chassis work	16:44
16:46	EE	Richard	Power supply room	n		16:50
16:47	PSL	RyanS, Jason	LVEA	n	PSL ion pump power cycling	17:23
16:52	ISC	Camilla	LVEA	n	Cleaning IOT2	17:54
16:58	VAC	Travis, Jordan	LVEA	n	Prep for RGA install, includes craning	19:04
16:59	AOS	Corey	LVEA	n	Photos + contamination control	18:33
17:07	EE	Jeff, Marc	CER	n	Power cycling timing comparator	17:21
17:17	EPO	Betsy	LVEA	N	Helping Corey	18:17
16:40	FAC	Tony, Randy	LVEA	n	Breaking BSC8 bolts	17:23
17:31	FAC	Chris	EY, EX	n	FAMIS tasks	18:38
17:45	EE	Jeff, Marc	CER	n	Replacing SUS C5 power supply	18:40
17:47	ISI	Jim	Ends	n	Restoring HEPI and checking BRS lasers	18:29
18:00	CDS	Tony, Erik	EX, EY	n	Dolphin issues, wifi issues	19:04
18:37	SEI	Jim	HAM8, EY, EX	n	EY HEPI, EX ISI coil drivers	21:01
18:37	ISC	Keita	LVEA	n	HAM1 RF work	19:30
18:40	EE	Jeff, Marc	CER, LVEA	n	Power cycling satamp	19:21
18:42	ISC	Camilla	LVEA	n	HAM1 RF cables	20:30
18:48		Betsy	LVEA	n	Checking on HAM1 work	20:30
19:01	CDS	Jonathan	CER	n	Moving a switch	21:07
19:05	CDS	Patrick	EX	n	Beckoff for BRS	19:54
19:44	OPO	Corey	LVEA	N	Grab camera equipment by ham1 garb room	19:48
20:13	ISC	Keita	LVEA	N	HAM1 RF work cont	20:31
20:29	VAC	Jordan, Melina	LVEA	n	RGA work	23:30
20:43	EE	Marc & Daniel	LVEA	N	Measure cables HAM1	22:04
21:23	CDS	Erik	MY, EY, EX	n	Weather sensor work at MY/EY, HWS work at EY/EX	22:54
21:25	SEI	Jim	LVEA	YES	HAM1 HEPI work	23:05
21:26	PSL	Keita	LVEA	n	Work on PSL FSS issue	22:10
21:41	PSL	Jason, RyanS	LVEA	n	Staring at PSL racks	21:54
21:47		Camilla	LVEA	YES	Transitioning to LASER HAZARD	22:02
21:54	PSL	Jason	LVEA	YES	Looking at lockout box	22:02
22:13	(⌐■_■)	LVEA IS LASER HAZARD	LVEA	YES	LVEA IS LASER HAZARD	23:24
22:24	ISC	Camilla, Betsy, Keita, Elenna	LVEA	YES	Opening lightpipe & opening HAM2 viewport	23:11
22:25	IAS	Jason	LVEA	YES	Setting up FARO for tomorrow	22:33
22:50		Richard	LVEA	YES	Checking that people are working safely	23:05
23:06	CDS	Erik	EY	n	Fixing dust monitor	23:32
23:13	ISC	Camilla	LVEA	YES	Going back to laser safe	23:22

H1 IOO - Found PSL beam through IMC trans and refl viewports on HAM2

elenna.capote@ligo.org — Mon, 07 Apr 2025 16:21:52 -0700

Author: elenna.capote@ligo.org

Report ID: 83794

[Betsy, Keita, Camilla, Richard M., Elenna]

After the power outage, we wanted to get some confirmation of PZT pointing out of the PSL. Betsy, Keita and Camilla went in the cleanroom with the IR viewer and indicator cards and took the covers off the IMC refl and trans viewports on HAM2. Keita found the beam out of the IMC REFL viewport, and I adjusted the IMC PZT in pitch and yaw under direction from Keita. I accidentally moved the pitch slider a bit at the beginning due to user error. Then, we took large steps of 1000 or 2000 counts to move the offsets in pitch and yaw.

Start values: pitch: 22721, yaw: 5488

End values: pitch: 21192, yaw: 6488

Then, Betsy found the beam out of the IMC TRANS viewport and Richard marked the beam spot approximately on the outside of the cleanroom curtain with a red sharpie. This is super rough but gives us a general location of the beam. We think this is a good enough pointing recovery to proceed with vent activities.

PSL

H1 ISC - Comment to Delay Measurements of REFL/POP RF Detectors

daniel.sigg@ligo.org — Mon, 07 Apr 2025 16:15:24 -0700

Author: daniel.sigg@ligo.org

Report ID: 83795

TDR Measurements attached (Marc, Daniel)

Non-image files attached to this report

T2500040-v1.pdf

H1 SUS - Comment to Power power outage OSEM recovery / Offset check

oli.patane@ligo.org — Mon, 07 Apr 2025 15:45:40 -0700

Author: oli.patane@ligo.org

Report ID: 83793

Comparing QUADs, BS, and TMSs pointing before to after outage. All had come back up from the power outage with a slightly different OPTICALIGN OFFSET for P and Y, due to the power outage taking everything down, and then when systems got back up, the OPTICALIGN OFFSETS were read from the sus sdf files, and those channels aren't monitored by sdf and so had older offset values. I set the offest values back to what they were before the power outage, but still had to adjust them to get the top masses pointed back to where they were before the outage.

'Before' refers to the OPTICALIGN OFFSET values before the outage, and 'After' is what I changed those values to to get the driftmon channels to match where they were before the outage.

SUS	Before	After
ITMX
P	-114.5	-109.7
Y	110.1	110.1 (no change)
ITMY
P	1.6	2.0
Y	-17.9	-22.4
ETMX
P	-36.6	-45.7
Y	-146.2	-153.7
ETMY
P	164.6	160.6
Y	166.7	166.7 (no change)
BS
P	96.7	96.7 (no change)
Y	-393.7	-393.7 (no change)
TMSX
P	-88.9	-89.9
Y	-94.3	-92.3
TMSY
P	79.2	82.2
Y	-261.9	-261.9 (no change)

H1 CAL - Pydarm code updated at LHO (and LLO)

joseph.betzwieser@ligo.org — Mon, 07 Apr 2025 15:39:16 -0700

Author: joseph.betzwieser@ligo.org

Report ID: 83792

[Joe B, Jamie R] On Friday, April 4th, Jamie updated the default pydarm install to version 20250404 (prior was 20250227) with a bug fix to allow for proper regeneration of reports utilizing the high frequency roaming line data we've been collecting all run, to help with uncertainty estimates above 1 kHz. This is the code which lives in /ligo/groups/cal/conda/, and is the default one you get when running pydarm at the command line. The update instructions Jamie followed can be found here: https://git.ligo.org/Calibration/pydarm/-/blob/master/DEPLOY.md?ref_type=heads CAL

H1 CDS - Comment to Beckhoff recovery from power outage

patrick.thomas@ligo.org — Mon, 07 Apr 2025 15:30:59 -0700

Author: patrick.thomas@ligo.org

Report ID: 83791

On the end X mains power monitoring Beckhoff machine I had to make the tcioc firewall profile also be enabled for the private network.

H1 SUS - Comment to Power power outage OSEM recovery / Offset check

ibrahim.abouelfettouh@ligo.org — Mon, 07 Apr 2025 15:19:26 -0700

Author: ibrahim.abouelfettouh@ligo.org

Report ID: 83789

Input:

PRM_P: -1620.8 -> -1672, (Changed by -51.2) PRM_Y: 579.6 -> -75.6 (Changed by -655.2)

PR2_P: 1555 -> 1409 (Changed by 146), PR2_Y: 2800.7 -> -280.8 (Changed by -3081.5)

PR3_P: -122.2 -> -151 (Changed by -28.8), PR3_Y: -100 -> -232.4 (Changed by -132.4)

MC1_P: 833.3 -> 833.3, MC1_Y: -2230.6 -> -2230.6 (No change)

MC2_P: 591.5 -> 591.5, MC2_Y: -580.4 -> -580.4 (No change)

MC3_P: -20.3 -> -20.3, MC3_Y: -2431.1 -> -2431.1 (No change)

Attached are plots showing the offsets (and their relevant M1 OSEMs) before and after the suspension was reliably aligned.

Images attached to this report

H1 TCS - TCS Chillers turned back on after Power Outage

camilla.compton@ligo.org — Mon, 07 Apr 2025 15:14:01 -0700

Author: camilla.compton@ligo.org

Report ID: 83788

Elenna, Camilla. TCS Chillers turned back on after Power Outage

H1 SUS - Recovery from 2025-04-06 Power Outage: +18V DC Power Supply to SUS-C5 ITMY/ITMX/BS Rack Trips, ITMY PUM OSEM SatAmp Fails; Replaced Both +/-18 V Power Supplies and Replaced ITMY PUM OSEM SatAmp

jeffrey.kissel@ligo.org — Mon, 07 Apr 2025 15:03:21 -0700

Author: jeffrey.kissel@ligo.org

Report ID: 83787

J. Kissel, R. McCarthy, M. Pirello, O. Patane, D. Barker, B. Weaver 2025-04-06 Power outage: LHO:83753 Among the things that did not recover nicely from the 2025-04-06 power outage was the +18V DC power supply to the SUS ITMY / ITMX / BS rack, SUS-C5. The power supply lives in VDC-C1 U23-U21 (Left-Hand Side if staring at the rack from the front); see D2300167. More details to come, but we replaced both +/-18V power supplies and SUS ITMY PUM OSEMs satamp did not survive the powerup, so we replaced that too. Took out +18V Power Supply S1300278 -18V Power Supply S1300295 ITMY PUM SatAmp S1100122 Replaced with +18V Power Supply S1201919 -18V Power Supply S1201915 ITMY PUM SatAmp S1000227 CDS, SYS

H1 ISC - Comment to WFS and LSC RF sensors were turned off

keita.kawabe@ligo.org — Mon, 07 Apr 2025 14:49:51 -0700

Author: keita.kawabe@ligo.org

Report ID: 83786

Turning off the DC interface for LSC REFL_B somehow interfere with FSS locking. Turns out that the DC interface provides power (and maybe fast readback of the DC output) of FSS RFPD.

Since the point of powering down was to safely disconnect the DC in-vac cable from LSC REFL_B, and since the cable was safely disconnected, I restored the power and the FSS relocked right away.

H1 CDS - Beckhoff recovery from power outage

patrick.thomas@ligo.org — Mon, 07 Apr 2025 14:26:06 -0700

Author: patrick.thomas@ligo.org

Report ID: 83785

There was a PSL Beckhoff chassis that needed to be powered on. There is an alog saying that I configured the PSL PLC and IOC to start automatically, so maybe this is what kept it from doing so? I physically power cycled the BRS Beckhoff machine at end X. It was unreachable from remote desktop and in a bad frozen state when I connected to it from the KVM switch. I started the end X NCAL PLC and IOC, the end X mains power monitoring PLC and IOC, and the corner station mains power monitoring PLC and IOC.

H1 SUS - Power power outage OSEM recovery / Offset check

ryan.crouch@ligo.org — Mon, 07 Apr 2025 14:19:31 -0700

Author: ryan.crouch@ligo.org

Report ID: 83780

Oli, Ibrahim, RyanC

We took a look at the osems current positions for the suspensions post power outage to make sure the offsets are still correct, the previously referenced "Golden time" was 1427541769 (the last drmi lock before the vent). While we did compare against this time we mainly set them to before the poweroutage.

Input:

IM1_P: 368.5 -> 396.1, IM1_Y: -382.7 -> -385.4

IM2_P: 558.0 -> 792.0, IM2_Y: -174.7 -> -175.7

IM3_P: -216.3 -> -207.7, IM3_Y: 334.0 -> 346.0

IM4_P: -52.4 -> -92.4, IM4_Y: 379.5 -> 122.5

SR2_P: -114.3 -> -117.6, SR2_Y: 255.2 -> 243.6

SRM_P: 2540.3 -> 2478.3, SRM_Y: -3809.1 -> -3825.1

SR3_P: 439.8 -> 442.4, SR3_Y: -137.7 -> -143.9

Output:

ZM6_P: 1408.7 -> 811.7, ZM6_Y: -260.1 -> -206.1

OM1_P: -70.9 -> -90.8, OM1_Y: 707.2 -> 704.5

OM2_P: -1475.8 -> -1445.0, OM2_Y: -141.2 -> -290.8

OM3_P: Didn't adjust, OM3_Y: Didn't adjust