MC SW WD bypassed

The MC2 SW WD tripped due to chamber activity, but not the sus WD. Oli let me know that the SWWD threshold is set a bit too low, and that the suspension itself looks ok, so I've bypassed the SWWD for now so we can keep the suspension damped if possible.

HAM2 ISI locked

Just before lunch yesterday, vac told me doors were off HAM2. I then went out and locked the ISI and added steps to the chamber.

Ops Day Shift Start

TITLE: 05/06 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: 0.18 μm/s
    Secondary useism: 0.23 μm/s 
QUICK SUMMARY: Currently riding out a 5.8 earthquake from the Aleutians. No new alarms, CDS overview has expected errors in: h1iopsusb2h34, h1suslo12-bbss, h1iopseib2. and h1seiproc has an IPC error.

• Dust counts - good
• Temps - good
• All chambers and suspensions in states according to teh whiteboard in the control room

HAM2 Doors are Removed

(Jordan, Travis, Randy, Mitchell, Gerardo)

The +Y and -Y doors are off HAM2. The removal of the doors was made easy by removing most of the bolts the prior day by Travis and myself.
    + Y Door we had both O-rings get stuck to the door, we used the O-ring tools to set the O-ring back into their groove without problems.  No further issues.
    - Y Door had similar issues as the +Y door, when the door separated from the HAM chamber the O-rings were stuck to the door, same fix as the other door.  Something to note, this door's chamber flange has lots of oxide residue on the outside of the outer O-ring, as if it was sprayed heavily with alcohol.

To be able to remove the doors for this chamber as well as HAM1, both chambers are under the same cleanroom, we need to shift the cleanroom along the Y axis to accommodate the forklift mast height when removing the doors, any door.  Maybe this cleanroom should get longer legs and maybe that way keep a permanent position.

A big "thank you" to those that helped move the cleanroom.

West Bay Work: BBS Arrived, Inspected and ERGO Arm Reassembled

Betsy, Ibrahim

Today we:

• Reattached vacuum tubing for the ERGO arm and tested it on some test glass.
  • Tubing is now new (Tygon A-60-F)
  • Vacuum was ran and attached
  • Crash pad moved from Bonding
• Inspected the BBS and fit-check the flipping fixture and magnet gluing set-up. Did a vague run-through of plan of attack tomorrow for the BBS first contact, magnet gluing and optic handling.

ALS return-from-vac beam measurements

Madi, Camilla

Yesterday Camilla and I went down to EX to measure the return-from-vacuum ALS beam
We placed a pellicle beamsplitter between the PBS and the LPM to pick off the ALS return beam and observe its shape and size
We put the pellicle in two different locations

• Location 1 : 175mm from PBS
• Location 2: 31inches from PBS -> 787.4mm from PBS
  • (Equivalent to 13inches from LPM -> 330.2mm from LPM)

Multiple measurements taken at each location, photos attached. The beam was quite large, and has two bumps on the peak. It was also too bright to take an image on a CCD. Looks better than former 'mickey mouse' shape observed, but still very far from a nicely shaped beam.

Ops Day Shift Summary

TITLE: 05/05 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: Both doors are now off of HAM2 and the ISI is locked. The new BBS has also been delivered and is being prepped near the test stand. Baffle installation in HAM3 continueds today as well, and the TCSY table water lines started to be replaced.
LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
14:54	VAC	Jordan	LVEA	-	Checking pumps (CP1)	15:02
15:14	FAC	Kim	LVEA	-	Technical cleaning	16:45
15:33	EE	Fil	MY	-	Picking up cables	16:03
15:40	FAC	Randy	LVEA	-	Prep for HAM2 door removal	16:08
16:00	SPI	Jeff	Opt Lab	-	Part spelunking	16:08
16:02	IAS	Jason, Stephen	LVEA	-	BS FARO surveying	18:59
16:08	VAC	Gerardo, Jordan, Randy	LVEA	-	HAM2 door removal	18:43
16:09	PEM	Robert	LVEA	-	HAM3 baffle installation	19:13
16:16	IAS	Ryan C	LVEA	-	BS FARO surveying	18:59
16:19	CAL	Tony, Dripta	PCal Lab	-	Prepping for measurement	16:45
16:26	PEM	Mitchell	LVEA	-	HAM3 baffle installation	19:25
16:46	CAL	Tony, Dripta	EX	YES	PCal measurement	18:49
16:50	FAC	Chris	LVEA	-	FAMIS checks	17:23
17:01	EE	Fil	MER	-	BHD electronics cabling	18:39
17:24	FAC	Chris	Ends, Mids	-	FAMIS checks	18:37
17:25	FAC	Kim	LVEA	-	Technical cleaning	18:13
17:27	VAC	Travis	LVEA	-	HAM2 door removal	18:44
17:37	SUS	Betsy, Ibrahim	LVEA	-	Many tasks (Betsy out @ 18:22)	18:37
18:13	FAC	Kim	FCES	-	Technical cleaning	18:59
18:23	SUS	Betsy	EX	-	Looking for ergo arm part	19:06
18:43	SEI	Jim	LVEA	-	Locking HAM2 ISI	19:06
19:18	FAC	Randy	LVEA	-	Craning in West bay	20:03
20:14	VAC	Jordan	LVEA	-	HAM6 RGA	20:23
20:15	FAC	Randy	LVEA	-	Moving scaffolding, BBS staging	22:13
20:15	SUS	Betsy	LVEA	-	BBS staging	Ongoing
20:19	IAS	Jason, Ryan C, Stephen	LVEA	-	BS FARO surveying	Ongoing
20:33	SUS	Ibrahim	LVEA	-	BBS staging	Ongoing
20:36	SAF	Richard	LVEA	-	Checks	21:09
20:39	CAL	Tony	PCal Lab	-	Checking part number	21:30
20:52	SEI	Jim	LVEA	-	HAM3 table masses	22:37
20:59	TCS	TJ, Camilla, Madi	LVEA	-	TCSY table water lines	23:30
22:07	SUS	Tom	LVEA	-	Delivering cables	22:13
22:10	VAC	Jordan	LVEA	-	HAM6 RGA	22:18
22:47	SLIC	Robert	LVEA	-	HAM3 baffle installation	Ongoing
22:55	VAC	Jordan, Gerardo	LVEA	-	Bringing pump to CP1	23:50

HAM6 RGA Maintenance

The HAM6 RGA tree had a known leak coming from the needle valve on the calibrated leak, so the calibrated leaks were removed from the system and the tree now only consists of the RGA, 10 l/s Ion Pump and a pump out port.

The tree was re-wrapped with heat tape and is currently baking at high temp using an aux cart and 80 l/s turbopump. Caution tape has been installed around the -Y door of HAM6, please avoid the area.

CDS Maintenance Summary: Tuesday 5th May 2026

WP13221 Add BBSS Fast Channels to DAQ

Tom, Oli, Erik, Dave:

18 BBSS_OSEMINF (SUM, X, Y) DQ channels were added to the DAQ, all at 256Hz. DAQ retstart was required.

WP13223 Add PT100A VACSTAT slow channels to DAQ

Dave:

A new H1EPICS_VACSTAT.ini was generated adding PT100A. An EDC+DAQ restart was required.

WP13228 Add FW2 slow channels to DAQ

Erik, Jonathan, Dave:

Puppet was changed to add three channels unique to FW2 (STATE_0, STATE_1, NUM_WRITERS). An EDC+DAQ restart was required.

WP13235 h1sush6 IO Chassis Install

Fil, Dave:

Fil moved the IO Chassis for h1sush6 from its temporary location in an adjacent rack into the SUSH6 rack on the MER. h1sush6 front end was powered down for the duration of this work.

DAQ Restart

Erik, Jonathan, Dave:

The DAQ and EDC were restarted.

FW2 stopped at the time puppet was upgraded due to a file creation race condition.

For the DAQ restart itself, the main issue was two spontaneous restarts of FW1, both after running for 10 minutes but not synced to the writing of the second trend frame files.

 

O5 HAM6 SUS Racks - SUS-M2 / SEI-M1 / SUS-R7

WP 13235
WP 13169
Drawing O5 SUS HAM6 (sush6) System Wiring Diagrams - D2300379

The O5 SUS HAM6 electronics and in-rack cabling installation in the MER is complete. System wiring diagrams D2300379 will need to be updated to show no IO h1susauxh6 was installed. New ADC cards (SUS AUX) were installed in the h1seih7 IO chassis.

IO chassis h1sush6 and h1sush7 share a 24V power supply. A dual Kepco power supply was installed to power the ±18V for SUS-M2. New electronics except the h1sush6 IO chassis were left powered off.

Status of the SUS-R7 rack is ongoing. All electronics installed. All long cables from MER and CER pulled and dressed. Rack requires ±18V and 200V for PSAMS. Depending on loads, plan is to use the SUS-R4 power supplies for the ±18V. The HV power supply will need to be placed on the HAM6 vacuum gauge interlock.

h1sush6 powered down for IO Chassis move

Fil, Erik, Dave:

we have powered down h1sush6 front end in preparation for Fil's move of the IO Chassis into the SUSH6 rack on the MER. Reminder that this front end is not connected to the Dolphin switch, so there is no risk of a corner station Dolphin glitch.

BSC2 Cartridge pictures and time lapse movie

Pictures and the timelapse video from the BSC2 Cartridge (alog 90021) last week are attached and/or at https://caltech.box.com/s/4ahvfvdnaev8iiz3ktgda8g00srpvv1x

 

 

Ops Day Shift Start

TITLE: 05/05 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: 14mph Gusts, 10mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.11 μm/s 
QUICK SUMMARY: Surveying on the BS at the test stand in the LVEA continues today, along with RGA work at HAM6 and CP1 regen near the Y-manifold. HAM2 doors are also likely to come off today.

Ops Day Shift Summary

TITLE: 05/05 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: Work continued with the BS on the test stand, preparations were made for HAM2 doors to come off later this week, and baffle installation in HAM3 all took place today.

I neglected to post this yesterday afternoon and unfortunately did not save the log.

Workstations updated

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

CP1 Regen Alarms

Gerardo, Jordan, Jonathan, Dave:

PT114 has started to rise rapidly. At 16:50 I changed its alarm high from 2.0e-08 to 5.0e-04.

Later PT114B's VACSTAT continued to trip due to the large delta-P. After clearing the alarms I have disabled PT114B in VACSTAT (but its level alarms remain active).

 

QOSEM Signal Chain Testing

[Tom Roocke, Oli]

Summary: The 6 QOSEMs and their signal chain for the BBSS are operational with the final sat amp, CER wiring, CDS mapping, in vac DB25 extension cables. All that remains to test before SUS installation is the duopus cables, which are in C&B currently.

In continuation from yesterday, we are testing out the QOSEM signal chain prior to installation of the BBSS. Yesterday we verified the sat amp was still functional and the readouts were showing up in CDS appropriately. See LHO:90072. Today we checked both the DB25 to DB25 extension cables, and the QOSEMs. To come is testing of the duopus cables, which are still in C&B.

DB25 Extension Testing:
Using a known functional Duopus cable (S2600215), and inair DB25, we tested the three DB25 extension cables by reading for the QOSEM coil resistance and diode drops at the in air DB25, where it connects to the sat amp. See the signal continuity test section in T2600170 for more information on this. All 3 cables are functional.

S2001548: DB25 working
S2100358: DB25 working
S2100410: DB25 working

QOSEM CDS Readout Testing:

Using a known functional Duopus Cable (S2600215), DB25 Extension (S2100410) and in air DB25, we checked for the open sum voltage in the CDS readout. This is the voltage seen on the sum channel of the QPD with no lens installed. Seeing a nonzero voltage here indicates that the QOSEM LED, QPD and signal chain are functional, but will be far lower than the operational sum level when the lens flag is appropriately focusing light onto the QPD. We tested the open sum voltage for all 6 QOSEMs designated for the BBSS. All QOSEMs and there signal chain are functional.

S2600008: working with open sum of 13910
S2600009: working with open sum of 14755
S2600010: working with open sum of 15550
S2600011: working with open sum of 15470
S2600012: working with open sum of 15348
S2600013: working with Open Sum of 14380

BSC2 Cartridge on the Test Stand

The BSC2 cartridge was removed from the BSC2 chamber today and placed on the Test Stand in the West Bay (+Y bay).  The lift took 3 "test lifts" to make very minor adjustments to the CG prior to lift out of the chamber - on the 4th lift, we were very well balanced so embarked on the flight.
Like LLO, the BS had it's "Stay Leg" assemblies and Vibration Absorber Assemblies removed for the flight.  This means it was probably lighter than the 2013 time (alog 5689) when we did this which had the weight slightly heavier.  The cartridge plus 3-point lift fixture and load cell together all weighed 9380 lbs.  It was rotated 90deg Counterclockwise per the procedures and landed on the threaded rod in the test stand with little issue other than careful craning and spotting.
All went as expected and according to the procedures E1200433-v3, E1200971-v4 and associated docs.

Mitchell, Travis, Tyler, Randy (on crane) all up on the platform
Jim and Tony inside of BSC2
Gerardo, Jordan on the eMod as Support
TJ on the camera
Betsy soaking it all in (support)

A pre-lift meeting was held to go over the teams and maneuver details (again) at 9am prior to work starting.

Particle counts up at the dome level were all 0,0 before starting.
More photos and videos will be posted when those folks have them available.

Covers used - A BS/QUAD SUS tube cover up underneath, an ISI cover up on the ISI, the BSC Cartridge sock which encased the whole thing, dropped down to Jim and Tony once the lift was up a couple feet.  

The bulk of the work was from ~10:30am-1pm.  Most of the time before was getting folks in headsets and gear and getting equipment on.