While we were out of lock yesterday, I replaced the viewport covers I had removed, so we are ready to go to laser safe when needed.
Robert Schofield, Richard McCarthy, Tyler Guidry, Genevieve Connolly, Ben Mannix, Jonathan Olson
Last summer, Genevieve identified the 35.4 Hz peak as likely from the office area air handler (80655). Recently, Ben was working a Data Quality Shift and reported that the peak had moved by tenths of a Hz and had increased dramatically in amplitude (82519). This week I used a speaker to sweep in the region around 35 Hz and found that there was a sharp maximum in vibration coupling that happened to lie just where the HVAC peak has been for the last couple of months (See Figure). This meant that, if we could move it just a little in frequency, we would reduce the amplitude in DARM. We power some of the HVAC equipment with variable frequency drives (VFD), which convert the mains 60 Hz to other frequencies. We set the office area air handler VFD to 69 Hz, instead of the 72 Hz that it had been running at, and greatly reduced the amplitude of the peak in DARM (see Figure, page 2).
TITLE: 02/24 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 153Mpc
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 21mph Gusts, 14mph 3min avg
Primary useism: 0.03 μm/s
Secondary useism: 0.26 μm/s
QUICK SUMMARY:
H1 has been locked and Observing for 4 hours now.
0:23 UTC LIGO Hanford Control room received a call about a ADreq super event candidate S250223dk that was not announced on verbal alarms and no Stand Down signal was given.
Incoming Earthquake from cayman Islands which we should survive.
All other systems are running well.
TITLE: 02/23 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 149Mpc
INCOMING OPERATOR: Tony
SHIFT SUMMARY:
H1 is currently with a 4+hr lock. Only 1-lockloss during the shift (from an EQ) and ran an Initial Alighnment because of tough ALS locking. H1 range for this lock started up at 160Mpc, but has dropped down to around 155Mpc in the last 4hrs. Also, this lock has the ITMy MODE-5 settings of: FM6+FM8+FM10 w/ gain of +0.010.
CDS: Been noticing glitches/color splashes on the cameras on nuc35 (mainly MC1 & PR3 for me) last few shifts.
Environmentally, secondary microseism has dropped below the 95th percentile over the last 8-10hrs. It's been breezy off/on during the shift as well (and it looks a bit stormy outside!).
LOG:
After the SQZ improved H1 range, about 15min later there was a 1832utc notification of an incoming M6.0 Solomon Island earthquake....this would cause a lockloss at 1856utc. H1's lock was 14hrs22min.
(V1 & L1 are still observing.)
After almost 24 hrs of H1 drifting down about 10Mpc (from about 156 down to 146Mpc, see attachment #1), and while I was looking at instructions for SQZ Checks and Improve Squeezing, H1 was dropped out of Observing due to the Squeezer at 1809utc (coincidentally around the time of the CP1 overfill). The CLF_LR, FC, and MANAGER nodes went down and then relocked automatically.
As it was relocking, the SQZ came back with a better OPO Temperature (After the SQZ came back, I tried small OPO TEC Temp slider changes, but it was already optimized), and it looks like the SQZ automatically improved H1 range! (see attachement #2)
Was hoping to see the "H1 Live" trace to be better at high frequency, but it is still higher than the reference above 1500Hz (see attachement #3).
Sun Feb 23 10:06:25 2025 INFO: Fill completed in 6min 22secs
TCs started at lower temps because of the warm up outside, so I reduced the trip temps from -30C to -60C. TCmins [-134C, -130C] OAT (+12C, 53F) DeltaTempTime 10:06:25
TITLE: 02/23 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 147Mpc
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 16mph Gusts, 11mph 3min avg
Primary useism: 0.03 μm/s
Secondary useism: 0.41 μm/s
QUICK SUMMARY:
H1's been locked 11hrs. There's a slow drift in H1 range for the last 24hrs (through 2-locks). I put in by hand the latest settings for ITMy MODE-5 a few minutes ago. Microseism still high, but with slight decrease and it's been breezy (up to 25mph) the last 12hrs.
TITLE: 02/23 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 150Mpc
INCOMING OPERATOR: Oli
SHIFT SUMMARY:
Lockloss from an earthquake
Took a few tries to get it relocked, did an Initial Alignment and it locked just fine.
Nominal_Low_noise Reached at 04:33 UTC
Observing at 04:35 UTC
The nominal settings for the violins seem to be working well, so I did not change it.
H1 has been locked for 1.5 hour.
LOG:
| Start Time | System | Name | Location | Lazer_Haz | Task | Time End |
|---|---|---|---|---|---|---|
| 19:34 | SAF | Laser Haz | LVEA | YES | LVEA is laser HAZARD!!! (⌐■_■) | 06:13 |
| 21:30 | pcal | tony | pcal.lab | yes | pcal work | 22:15 |
| 02:30 | PEM | Robert | LVEA | Yes | Covering Viewports. | 02:39 |
Lockloss due to a 5.6 Mag earthquake from the Soloman Islands, or a number of smallish earthquakes from the same region.
https://ldas-jobs.ligo-wa.caltech.edu/~lockloss/index.cgi/event/1424312644
TITLE: 02/22 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 153Mpc
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
SEI_ENV state: USEISM
Wind: 3mph Gusts, 0mph 3min avg
Primary useism: 0.03 μm/s
Secondary useism: 0.45 μm/s
QUICK SUMMARY:
Nice shift for H1 with a lock over 12.5hrs. Also ran the Saturday calibration. Microseism is still high.
LOG:
TITLE: 02/23 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 153Mpc
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 7mph Gusts, 5mph 3min avg
Primary useism: 0.03 μm/s
Secondary useism: 0.41 μm/s
QUICK SUMMARY:
H1 has been Locked for 12.5 hours.
If Unlocked:
Violin ITMY Mode 5 settings were changed by the Day Ops by hand because Rahul had mentioned to Corey that IY m5 should not have a zero gain.
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=82975
Other than that all systems are running well.
Earlier in the shift, happened to notice IY Mode-1's gain was not at nominal (it was at 0 instead of the nominal -10); this mode was NOT rung up and was decent with an OUTPUT around ~2...it was slightly increasing. (See attachment#1 for a look at this mode for the last 24hrs.)
I had tried to take the gain to -10 while in Observing, but VIOLIN_DAMPING would immediately take the gain back to 0. I chatted with Rahul and he mentions that sometimes this happens. We decided to hold off with this gain for a bit, because Rahul was not sure whether taking the VIOLIN_DAMPING guardian from DAMPING_VIOLINS_FULL_POWER to DAMPING_ON_SIMPLE would take us out of Observing, but.....we were going to drop out of observing for Calibration shortly.
VIOLIN_DAMPING Guardian State Change Takes H1 Out Of OBSERVING
At 1930utc, took took the violins guardian to DAMPING_ON_SIMPLE, and this took us out of OBSERVING. At this point, I then ran the calibration. Once the calibration measurement was complete, at 2000utc, I took IY Mode-1's gain from 0 to it's nominal of -10.0.
Then returned the violin guardian to DAMPING_VIOLINS_FULL_POWER. (See attachment#2 for a look at when the gain was restored.)
Measurement NOTES:
Sat Feb 22 10:08:23 2025 INFO: Fill completed in 8min 19secs
TCmins [-81C, -79C] OAT (+4C,40F) DeltaTempTime 10:08:23
While filling out the Lock Reacquisition Survey, noticed that for the two locks overnight:
TITLE: 02/22 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 153Mpc
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
SEI_ENV state: USEISM
Wind: 3mph Gusts, 0mph 3min avg
Primary useism: 0.03 μm/s
Secondary useism: 0.45 μm/s
QUICK SUMMARY:
H1's been locked almost 4hrs. H1 has not shown the glitchy behavior for the last 12hrs (on Omicron) and our violins are looking much better, too!
Environmentally secondary microseism continued its increase and is now squarely at the 95th percentile; winds are calm, but there was a little windstorm between 3-5hrs ago with gusts above 20mph.
Calibration is scheduled for 1130amPDT (1930utc).
TITLE: 02/22 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Lock Acquisition
INCOMING OPERATOR: Oli
SHIFT SUMMARY:
H1 was locked for 6 Hours and 58 Minutes...
And Then... Unknown lockloss 15 Minutes before the end of the Shift.
https://ldas-jobs.ligo-wa.caltech.edu/~lockloss/index.cgi?event=1424238353
I had H1 do an Initial alignment and started normal locking before leaving.
The Violin Mode IY Mode 5 may need to be adjusted again as it was previously set to FM 6,8,10 with a gain of + 0.01 instead of it's nominal state which was working well.
LOG:
No Log
Strange Dip in H0:VAC-MY_FAN2 _2702 and a half days ago.
Averaging Mass Centering channels for 10 [sec] ...
2025-02-21 19:13:29.266265
There are 16 T240 proof masses out of range ( > 0.3 [V] )!
ETMX T240 2 DOF X/U = -0.872 [V]
ETMX T240 2 DOF Y/V = -1.013 [V]
ETMX T240 2 DOF Z/W = -0.359 [V]
ETMY T240 3 DOF X/U = 0.313 [V]
ITMX T240 1 DOF X/U = -1.715 [V]
ITMX T240 1 DOF Y/V = 0.441 [V]
ITMX T240 1 DOF Z/W = 0.52 [V]
ITMX T240 2 DOF Y/V = 0.337 [V]
ITMX T240 3 DOF X/U = -1.779 [V]
ITMY T240 3 DOF X/U = -0.723 [V]
ITMY T240 3 DOF Z/W = -2.288 [V]
BS T240 1 DOF Y/V = -0.325 [V]
BS T240 3 DOF Z/W = -0.397 [V]
HAM8 1 DOF X/U = -0.307 [V]
HAM8 1 DOF Y/V = -0.421 [V]
HAM8 1 DOF Z/W = -0.687 [V]
All other proof masses are within range ( < 0.3 [V] ):
ETMX T240 1 DOF X/U = 0.091 [V]
ETMX T240 1 DOF Y/V = 0.038 [V]
ETMX T240 1 DOF Z/W = 0.101 [V]
ETMX T240 3 DOF X/U = 0.107 [V]
ETMX T240 3 DOF Y/V = 0.05 [V]
ETMX T240 3 DOF Z/W = 0.051 [V]
ETMY T240 1 DOF X/U = 0.129 [V]
ETMY T240 1 DOF Y/V = 0.217 [V]
ETMY T240 1 DOF Z/W = 0.287 [V]
ETMY T240 2 DOF X/U = -0.034 [V]
ETMY T240 2 DOF Y/V = 0.248 [V]
ETMY T240 2 DOF Z/W = 0.096 [V]
ETMY T240 3 DOF Y/V = 0.168 [V]
ETMY T240 3 DOF Z/W = 0.19 [V]
ITMX T240 2 DOF X/U = 0.229 [V]
ITMX T240 2 DOF Z/W = 0.295 [V]
ITMX T240 3 DOF Y/V = 0.172 [V]
ITMX T240 3 DOF Z/W = 0.164 [V]
ITMY T240 1 DOF X/U = 0.13 [V]
ITMY T240 1 DOF Y/V = 0.166 [V]
ITMY T240 1 DOF Z/W = 0.083 [V]
ITMY T240 2 DOF X/U = 0.054 [V]
ITMY T240 2 DOF Y/V = 0.286 [V]
ITMY T240 2 DOF Z/W = 0.192 [V]
ITMY T240 3 DOF Y/V = 0.123 [V]
BS T240 1 DOF X/U = -0.126 [V]
BS T240 1 DOF Z/W = 0.193 [V]
BS T240 2 DOF X/U = -0.002 [V]
BS T240 2 DOF Y/V = 0.106 [V]
BS T240 2 DOF Z/W = -0.047 [V]
BS T240 3 DOF X/U = -0.099 [V]
BS T240 3 DOF Y/V = -0.283 [V]
Assessment complete.
Averaging Mass Centering channels for 10 [sec] ...
2025-02-21 19:16:03.265814
There are 1 STS proof masses out of range ( > 2.0 [V] )!
STS EY DOF X/U = -2.336 [V]
All other proof masses are within range ( < 2.0 [V] ):
STS A DOF X/U = -0.46 [V]
STS A DOF Y/V = -0.842 [V]
STS A DOF Z/W = -0.555 [V]
STS B DOF X/U = 0.251 [V]
STS B DOF Y/V = 0.955 [V]
STS B DOF Z/W = -0.313 [V]
STS C DOF X/U = -0.86 [V]
STS C DOF Y/V = 0.793 [V]
STS C DOF Z/W = 0.694 [V]
STS EX DOF X/U = 0.016 [V]
STS EX DOF Y/V = -0.038 [V]
STS EX DOF Z/W = 0.123 [V]
STS EY DOF Y/V = -0.066 [V]
STS EY DOF Z/W = 1.362 [V]
STS FC DOF X/U = 0.192 [V]
STS FC DOF Y/V = -1.1 [V]
STS FC DOF Z/W = 0.662 [V]
Assessment complete.
