TJ, Ibrahim, Betsy, Camilla, WPs 12428, 12414

We added guillotines to all VPs, removed the bellows and added yellow VP covers. IOT2 bellows were very tight so couldn't be removed until we moved the table an ~inch away from HAM2.  The tables bellows adapters were covered with ameristat and the bellows were covered with foil and placed on a nearby rack. Photo.

We moved the small garbing cleanroom up against the TSCY / the HAM3 cleanroom. We moved ISCT1 and IOT2 next to it on the other side of the racks, leaving space and a pallet for the HAM1 door. Photo. 

TJ and I removed and disassembled the HAM2 scaffolding and stored it with the other scaffolding in the High bay. 

Tue Apr 01 10:12:47 2025 INFO: Fill completed in 12min 43secs

FAMIS 24833

pH of PSL chiller water was measured to be between 10.0 and 10.5 according to the color of the test strip.

Eric, Dave:

Bypass will expire:
Tue Apr  1 11:52:44 AM PDT 2025
For channel(s):
    H0:FMC-CS_FIRE_PUMP_1
    H0:FMC-CS_FIRE_PUMP_2
 

TITLE: 04/01 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 8mph Gusts, 4mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.22 μm/s
QUICK SUMMARY:

IFO is in NLN and OBSERVING, but not for long.

H1 was running PEM Mag injections when I walked in, which finished and went into OBSERVING thereafter. I will induce a lockloss and set IFO to PLANNED ENGINEERING shortly.

Today is the first day of our planned Vent Break! Here is a summary of today's planned activities, also found on Trello Coordination Page

• Transition to Laser SAFE - vent, close light pipes, keys off (TJ)
• Turn Guard States to appropriate DOWN states (OPS)
• Close gate valves (VAC)
• Get purge systems going (VAC)
• HAM1 vent checklist (VAC)
• Corner vent prep (VAC)
• Corner leak check (VAC)
• Lock all HAM HEPIs (JIM/SEI)
• Crange large West Bay cleanroom over BSC8, inspect (FAC)
• Crane engine hoist to BSC8 (FAC)
• Inspect HAM1 and BSC8 final cleanroom (FAC)
• Turn on HAM1 cleanroom/garb room

Work safe everybody!

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

TITLE: 03/31 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 150Mpc
INCOMING OPERATOR: TJ
SHIFT SUMMARY:

Tonight is the last in-person Operator shift (TJ is the last OWL) before the April-Jun2025 Maintenance+Commissioning Break which begins at 8am (Local Time) tomorrow morning.

H1 has been stellar.  Rode through an Alaskan EQ and is going on almost 7.75hrs of lock.  And the range has been higher than normal (just under 159Mpc)....but then it went back to the normal 150Mpc after the SQZ lost lock and relocked toward the end of the shift.
LOG:

• ISS Array group continues work in the Optics Lab (myank, siva, jennie, keita, rahul)
  • 0015 jennie, rahul, and keita left
  • 0215 myank, siva left
• 0022 Drive to welding shop (vpw bldg) to drop off tooling (jim)
• 0411 Incoming M5.2 EQ from Alaska (Verbal said Canada) at about 2800miles away.  H1 rode through this EQ fine; there was no wind and secondary microseism is just about between the 50th & 95th percentile lines.
• 0436-0439 Dropped from OBSERVING due to SQZ (which restored automatically).  SQZ SHG Fiber Rejected Power has been high and has a message about this.

Just had a ~3min drop from OBSERVING due to SQZ, but it cameback automatically. 

Did notice the SQZ_OPO_LR node has the familiar User Message:

"pump fiber rej power in ham7 high, nominal 35e-3, align fiber pol on sqzt0"

It's been trending up the last 5 days when it was last touched up on 3/26 (alog83570).  Looks like it moved above 0.35 counts at 10am (local time) this morning.  See attached.

It's been a few minutes and one can see H1's range took a step down about 6Mpc after this SQZ drop.

[M. Todd, C. Compton]

Camilla and I made several knife edge measurements of the L5 CO2 laser in the optics lab after she got back from her trip to Access. The beamwidth estimates are consistent with tests done by Gabriele and Camilla

Measurements:

1.  20250327 - razorblade 16cm from laser aperature
2.  20250328 - razorblade 16cm from laser aperature (moved laterally to have more range)
3.  20250328v2 - razorblade 16cm from laser aperature

Results:

Fits to both the numerical derivative and cumulative yield similar estimates of the beamwidth (1/e^2 radius) : around 1.3mm at 16cm from the aperature is consistent with the beam profiles done in Gabriele and Camilla's test, which estimated the beam waist to be around 1.2mm.

Closes FAMIS 26036. Last checked in alog 83560.

Overall much quieter traces across all plots from last week's. Namely, the 7.6Hz to 9Hz elevated signals and peaks that Oli found seem to be gone. Plot attached.

TITLE: 03/31 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 155Mpc
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 19mph Gusts, 12mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.17 μm/s
QUICK SUMMARY:

Ibrahim is handing over an H1 which has been at Nominal Low Noise for 2+hrs (and a nicer range just under 160Mpc---woo woo Sqz commissioning work this morning).  Ibrahim also schooled me on when wind at EY can cause us grief if it hits EY at a pesky angle---like it was at 2000utc today).

Speaking of winds, it's continues to be generally below 25mph for the last 12hrs (but the forecast says it should drop after sunset.  Secondary microseism had a small hump up between 10-22hrs ago and hovers just over the 50th percentile.

TITLE: 03/31 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 152Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY:

IFO is in NLN and OBSERVING as of 21:24 UTC

Overall calm final day of O4b with a successful comissioning session. Things of note:

• Lockloss 1: ETM Glitch Caused
• Lockloss 2: Wind Caused
  • We are more susceptible to wind coming in from the 40-70 degree range due to the one torn wind fence panel (attached screenshot). Elevated 0.3-1Hz and 0.03-0.1Hz EY ground motion was preventing locking for around 1 hr despite only 25-30 mph winds.
• Hanford Site called around 12:30 PT to warn of planned sirens and drills though we were unlocked

LOG: