Sun Jan 04 10:09:35 2026 INFO: Fill completed in 9min 31secs

At 9:42p local I received a cell alert declaring a loss of chilled water supply at End X. After remotely logging into FMCS I observed that the lead chiller (1) was in alarm and the CH-1 supply temp was hovering around 54F. I've since toggled the lead lag, and manually forced chiller 2 and chilled water pump 2 on. Given the low outside air temps and the lack of temp demands that vent require, this should suffice until all return from the break where we can investigate further.

T. Guidry

Sat Jan 03 10:09:51 2026 INFO: Fill completed in 9min 48secs

There were some SEI trips earlier today due to an earthquake. Dave went in and reset the software WDs earlier (88671), so to get the system back up to where it was before the earthquake, I went through and reset ISI and HPI to nominal for the chambers that needed them reset (aka not resetting them for the systems where we already have them down due to venting). Tony's overview and WD screenshots from Wednesday are a good reference for what state everything was in before the earthquake. This is what the OPS Overview looked like before I started resetting everything. Everything now that needed to be reset is back how it was before the earthquake (overview now).

Upcoming LN2 deliveries at x mid and x end required some tumbleweed attention this afternoon. X1 is still largely clear and x mid should be easily accessible. The earlier half of X2 is the worst area. I was able to cut a single lane to X2 before the harvester jammed up beyond what I could free by myself. What remains in the harvester chute needs a few days to dry out. As do I.

As a follow up to my previous log I checked the magmeter in the water room which meters domestic supply to the site and found a reading of 1011247.

T. Guidry

Site Walk Through 2 Jan 2026

LExC is in great shape no indication of problems.

Staging building is in good shape.

VPW two ovens running and in the parameters that Chris told us.  Weld shop temperature was fine so no pipe issues.

LSB looks fine.  Tyler was in his office

OSB/LVEA everything was in order.  Kobelco running door covers billowing slightly.  No signs of problems.

Mid and Ends were fine.  

Carpenter shop/ water room fire pump room and electrical room were all fine.

FCES in great shape.  

I leave the site with, Tyler clearing a path to EX for LN2 delivery.  I am his phone buddy.

Fri Jan 02 10:03:34 2026 INFO: Fill completed in 3min 32secs

Both end station test mass Software Watchdogs tripped around 06:22 during an earthquake. The Seismic systems also tripped for ETMX and ETMY. The TMS suspensions did not trip.

At 10:30 I reset these SWWDs, end station SUS and SEI are driving again.

Thu Jan 01 10:04:27 2026 INFO: Fill completed in 4min 24secs

VACSTAT detected a small beamtube vacuum gas release originating at the EX BT-IonPump which is located at approx -300m from EX.

Pressure trend shows the pressure at PT527 increased from its baseline of 1.9e-09 to a max of 1.4e-08 Torr. Several seconds later the EX gauges showed a minimal increase when the dispersed molecules reached them.

PT527 had pumped back down to its baseline by 04:30, +50 minutes after the glitch.

VACSTAT raised a single-gauge alarm for PT527, its rate-of-rise did not trip (reached 40% of trip level) but its Delta-P did trip (reached130% of trip level).

At 08:39 I restarted the vacstat_ioc.service on cdsioc0 to clear this alarm. As before, HAM1's gauge is currently set to disabled.

TITLE: 12/31 Day Shift: 1530-0030 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, 1mph 3min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.68 μm/s 
QUICK SUMMARY:

Cameras:
Everything looks fine currently.  
No thing looksout of place. 

PSL status: 
Laser Status:
    NPRO output power is 1.824W
    AMP1 output power is 70.67W
    AMP2 output power is 139.6W
    NPRO watchdog is GREEN
    AMP1 watchdog is GREEN
    AMP2 watchdog is GREEN
    PDWD watchdog is GREEN

PMC:
    It has been locked 21 days, 20 hr 49 minutes
    Reflected power = 26.19W
    Transmitted power = 106.1W
    PowerSum = 132.3W

FSS:
    It has been locked for 8 days 2 hr and 17 min
    TPD[V] = 0.4524V

ISS:
    The diffracted power is around 3.1%
    Last saturation event was 8 days 1 hours and 27 minutes ago

Possible Issues:
    PMC reflected power is high

Wed Dec 31 10:04:32 2025 INFO: Fill completed in 4min 29secs

Short fill following the dewar top up yesterday.

Site Inspection 30Dec2025

LExC is in great shape no indication of problems.  I did have some visitors that didn't want to accept no as the answer to going into LExC.  They just wanted some pictures.  I explained it is a big empty building right now but they were undetered at wanting pictures.

WS Dept of Health was on site checking the remote dosimiter they monitoy off our the access drive.

Staging building is in good shape.

VPW two ovens running and in the parameters that Chris told us.  Weld shop temperature was fine so no pipe issues.

LSB had two 5 gallon water bottles sitting outside the door.   I moved them into the Lobby.  Other than that builing looks great. Landscapers were working on removing vines from the building on the patio side.

OSB/LVEA everything was in order.  Kobelco running door covers billowing slightly.  No signs of problems.

Mid and Ends were fine.  Mx had the lights on when I arrived.  They are off now.

Carpenter shop/ water room fire pump room and electrical room were all fine.

FCES in great shape.  FC Enclosure could use a cleaning but is fine.

Tue Dec 30 10:06:14 2025 INFO: Fill completed in 6min 11secs

CP1 Dewar fill started 09:34 and was ongoing at time of CP1 fill.

TITLE: 12/29 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 17mph Gusts, 11mph 3min avg
    Primary useism: 0.05 μm/s
    Secondary useism: 0.32 μm/s 
QUICK SUMMARY:

• CDS, SEI, SUS look as expected
• Temperatures look stable
• No new notifications on DIAG_MAIN
• Nothing new or concerning on the cameras
• A look at the EY wind fence

*I misremembered the schedule and also checked in on Friday, whoops sorry Tony.

Mon Dec 29 10:06:20 2025 INFO: Fill completed in 6min 17secs

Sun Dec 28 10:07:58 2025 INFO: Fill completed in 7min 55secs

Sat Dec 27 10:10:00 2025 INFO: Fill completed in 9min 56secs

Utilizing the buddy system, (R. McCarthy) I walked the site today and found no immediate issues. The first half of x2 is a barely passable but am working with VAC to determine the next delivery location. To that end, all CP access points are largely unobstructed. The wind fence shows no additional damage at EY, and EX is still intact. FAC systems are operating normally. Large heat load spaces felt cool, no doors were found ajar and the water system is behaving normally (presently full @ ~66.5"). VEA's were all business as usual. 

During the visit I noted a magmeter flow value of 1010675 which should serve as a useful metric in determining any leak/bleeding of the potable system. While at the water room, domestic supply pressure appeared to be holding well. A follow up on the morning of 1/5 will be performed to understand usage over the break while little to no demand is applied.

T. Guidry

TITLE: 12/26 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 25mph Gusts, 16mph 3min avg
    Primary useism: 0.05 μm/s
    Secondary useism: 0.90 μm/s 
QUICK SUMMARY:
Cameras:
Everything looks fine currently.  
Lights were left on in the Woodshop & OSB 163, ifsomeone is heading to site. 


SEI: Looks as I'd expect it to look. HAM7 is red because it's had people in and out of it since before the break. I imagine leaving that watchdog tripped is fine.
SUS: Seems to be looking reasonable as well considering the OPO and Jack work that was being done before break.

PSL Status: 

Laser Status:
    NPRO output power is 1.84W
    AMP1 output power is 70.51W
    AMP2 output power is 139.4W
    NPRO watchdog is GREEN
    AMP1 watchdog is GREEN
    AMP2 watchdog is GREEN
    PDWD watchdog is GREEN

PMC:
    It has been locked 16 days, 17 hr 48 minutes
    Reflected power = 25.41W
    Transmitted power = 106.2W
    PowerSum = 131.6W

FSS:
    It has been locked for 2 days 23 hr and 15 min
    TPD[V] = 0.5254V

ISS:
    The diffracted power is around 3.7%
    Last saturation event was 2 days 22 hours and 25 minutes ago

Possible Issues:
        PMC reflected power is high
 

VEA Temps:

LVEA looks good for the last day.

The HAM Shaq looks good.

Arm VEAs