This morning at 16:03UTC, Corey heated up OM2 by setting H1:AWC-OM2_TSAMS_POWER_SET to 4.6, plot attached.

Sheila, Camilla

• no squeezing time: 20:06-20:11 UTC (ref 19)
• 20:15:17-20:19  UTC FIS demod angle 127.05 (ref 21)
• FIS mid sqz + 20:21:52- 20:25:00 UTC demod angle 144.12 (ref 22)
• FIAS 20:29- 20:32 demod phase 242.73 FIAS demod angle 242, clf servo sign flipped (ref 23)
• 20:36-20:39 FI mid sqz other side, CLF servo sign -, demod angle 110.39 (ref 24)
• 20:40:30 - 20:43:30 mean sqz, ADF off (ref 25)
• 20:48:30 - 20:51:30 FDS demod angle 121.63 tuned for High Freq (ref 26)
• 20:54:30 - 20:57:30 FDS demod angle 137.75 tuned for 200Hz  at same time as Robert's sweep (ref 27)

Camilla then noticed that my angle tuning for FDS above wasn't very good, so she repeated that. 86737

Took above data at NLG of 24.0, measaured a few hours ago 86729.

at 19:25:38-19:56:30 UTC we went to no sqz with OM2 hot.

There was a 29Hz peak injected by Robert, and this was 1 hour 30 minutes after power up.

In this alog, I showed a plot that compares the CHARD P and INP1 P noise before and after the HAM1 ISI install. Last night, I took the measured CHARD P coupling function and calculated the CHARD P contribution to DARM just before the vent to install the HAM1 ISI, and from a high range time this past weekend, with the HAM1 ISI installed. The attached plot compares DARM before and after the vent and the CHARD P contribution to DARM before and after the vent.

Turns out the change in CHARD noise may have actually directly reduced some noise in DARM. The DARM/CHARD coupling function remained the same before and after the vent, so the improvement is directly due to the reduction of noise in CHARD.

We were running HAM1 feedforward to the pitch ASC before the install, but it varied in performance. My plot in the linked alog shows the best performance achieved, but looking at the data closer to the vent, the noise in CHARD P may have been higher than the best performance I show in the linked alog above.

The low frequency noise in DARM has also changed for other reasons:

• DHARD is now on two sensors, reducing the DHARD noise by rt2 (85774)
• MICH ASC has better low pass filters engaged (85893)
• CSOFT P has better low pass filters engaged (85823)
• Improved LSC feedforward (86481, 86370, 86423)
• PEM team sourced and reduced some large peaks (86257)

Closes FAMIS#37256, last checked 86348

ndscope

Things to note:
Possible issues:
CS_DUST_LAB1_{300,500}NM both stalled at a value 16 days ago
CS_DUST_DR1_300NM has been at zero for the past four days
CS_DUST_DR1_500NM has been at zero for the past six days

Not an issue:
CS_DUST_LVEA5_300NM has been at 0 for three months - since we turned it off after the vent
CS_DUST_LAB2_{300,500}NM both off as expected (comparing to last month when Ryan C didn't mention it as an issue)

Thu Sep 04 10:05:52 2025 INFO: Fill completed in 5min 48secs

Gerardo confirmed a good fill curbside.

15:59:33 Wed 03sep2025 PDT power glitch. H1 was in lock throughout and no impact on range.

H1 lockloss a few after hitting the 42hr mark for a lock (42hrs03min).  At this time we were in at the beginning of 6hr commissioning period and at the time of the lockloss we were about ~10min into running the DARM Offset script for OM2 heating set-up.

TITLE: 09/04 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 155Mpc
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 5mph Gusts, 2mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.08 μm/s
QUICK SUMMARY:

Day 2 of being locked since Maintenance (41.5hrs)!  Commissioning starts in 12min.  All is quiet seismically (microseism is below the 50th percentile even!) and winds are low.

H1 just had it's 3rd superevent in 10hrs 1hr ago (1350utc).

TITLE: 09/04 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 151Mpc
INCOMING OPERATOR: Ibrahim
SHIFT SUMMARY: Another very quiet shift with H1 locked and observing throughout, plus one candidate event. H1 has now been locked for 32 hours.
LOG:

• 03:33 - S250904ae

FAMIS 28421, last checked in alog86614

Once again, too low of coherence for ITMX, so no new data point there. The most recent point is from the August 19th measurement.

FAMIS 28464, last checked in alog86272

Nothing much out of the ordinary here that I can see aside from the fact that the ITMX SLED is getting awfully close to the 1mW lower power threshold and will likely hit it in the next month.

TITLE: 09/03 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 156Mpc
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY:

Today we had Commissioning time to make up for the time from Monday's holiday.  Also had the opportunity to take H1 to the new ASC High Gain mode to ride out a Magnitude 6.0 earthquake!  H1 is approaching 26.5hrs of lock.
LOG:

• 1435-1503 emergency light replacement @mx
• 1436 Check-in chat with RRT in teamspeak
• 1500-1530 Calibration
• 1503 opening receiving for grabbing cardboard & then garbage at woodshop via elec cart (kim)
• 1503-1550 MY cleaning (nellie)
• 1530 Commissioning Begins
  • 1530-1615Robert measurements first
    • 1617-1630 Walking quietly in lvea (robert)
    • CR measurements
  • 1616-1626 Jim HAM1 injection
  • 1627 Sheila/camilla measurements
• 1557-1725 End Station trips (no VEA entry) for HEPI/Dust Monitor FAMIS (mitch)
• 1602-1626 EX to take a photo (no VEA entry) (chris)
• 1643-1702 SPI inventory in optics lab (jeffk)
• 1655-1740 TCS chiller FAMIS check (corey)
• 1723-1743 Optics lab clean & checks (kim)
• 1745-1849 MX cleaning (kim)
• 1755 Surveryors escorted to MY for CEBEX (tyler)
• 1813-1818 Checking ISC table enclosure vents in LVEA (corey---went out when Robert went out)
• 1838 Commissioning Ends
• 2023-2048 Dropping off stuff at MY (travis)
• 2102 EQ alert for M6.0 in Aleutians & SURVIVED via "ASC High Gain" Mode!  (alog)
  • 2112 - 2157 Out of Observing to "ride" the EQ
• 2115-2220 Benton PUD arrives to work at MY for CEBEX
• 2248 Taking a measurement in the Optics Lab area (travis)

TITLE: 09/03 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 151Mpc
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 8mph Gusts, 3mph 3min avg
    Primary useism: 0.05 μm/s
    Secondary useism: 0.11 μm/s
QUICK SUMMARY: H1 has been locked for 26 hours. Sounds like commissioning and riding through earthquakes today all went well.

• Wind low, ground motion coming down after earlier EQ
• All other systems nominal

(Elenna C [in spirit], Ibrahim A, Corey G, Tony S, Jim W)

Summary:  H1 survived a magnitude 6.0 EQ in Alaska via new ASC High Gain button/state.  This preserved a 24+hr lock.  This probably saved us (at minimum 2.5hrs of downtime!):  (1) ~90 min for the earthquake seismic noise to die down & (2) for 1-2hrs of locking.  L1 went DOWN due to this EQ about 20min after we saw it rolling through LHO!

Had my first experience getting to ENGAGE the new RED "ASC Hi Gn" button (see Elenna's alog) for an earthquake!  This tool is still fairly new and "manual" (& cool!) for operators.  Main items for engaging at this point (for me, as a newbie) was waiting for SEI_ENV to go to EARTHQUAKE mode and also watched for any colors on the Picket Fence.  While we were dealing with this earthquake, Jim walked in to also observe and answer questions for us; Ibrahim also gave advice since he's engaged this EQ mode twice.  All the details for what happened are logged below.

How Everything Went "Down"!

2102 VerbalAlarm:  "EQ alert for M6.0 in Aleutians"  (it said "Incoming earthquake from Canada")

• 2111 Seismic:  EQ Mode Activated! (due to R-Wave arrival)
• 2112 Out of Observing & clicked Earthquake on Observatory Mode
• 2113 Hit the "ASC Hi Gn" (red) button (on this bright green pop-up terminal, I typed in "yes".....but had to open another one, because it only needs "y").  Within a minute or two, the script completed the transition to "ride" out the earthquake.
  • Also around this time, started seeing yellow on picket fences, followed by some oranges.  This EQ started to show up as a big spike on the earthquake band on the wall (see 1st attachment).
    • Also saw this EQ in secondary microseism.
  • 2114 ASC oscillations appear
  • 2116 ALL Picket Fences are yellow or orange!
  • 2117 Peakmon reaches max just a hair under 2500 nm/s on Peakmon
  • 2117, 2121:  EX saturations on VerbalAlarms
  • (2134 L1 goes DOWN due to EQ....2nd attachment for the earthquake when it took L1 down)
  • 2154 Seismic back to CALM
    • SEI_ENV took about a minute or so to make the transition to CALM (all guardian nodes on ISI_CONFIG eventually go green).  Once everything was GREEN....
    • On ISI_CONFIG, clicked the blue "ASC Low Noise" button & this pops up another bright green terminal, and I entered a "y" and this transitioned H1 back to NLN with our usual High Sensitivity.
  • 2157 H1 Back to OBSERVING!
  • (2254 L1 back to OBSERVING)

Using Vibration Sensors To Gauge Health Of HVAC Fans Site Wide FAMIS 26592

H0:VAC-EX_FAN2_570_1 & 2 both seem to have gotten significantly more noisy for about 27 hours from 1800 UTC on Sep 1st to 2100 UTC on Sep 2nd