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
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:
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.
Camilla, Sheila.
The drop was because the OPO PZT ran out of range, see t-cursor on attached plot. It's a known issue that the SQZ angle (and alignment) changes with different PZT1 voltage.
It seems like that the sqz angle was set for 60-70V and was bad once we relocked at 100V. This would have been improved by taking SQZ_MANAGER to SCAN_SQZANG_FDS so it can find the best sqz angle again. If we were running the SQZ_ANG_ADJUST servo, this may have improved itself as you can see the ADF reported SQZ angle change at the time.
With the higher (19 vs 11) NLG 83665, the range and 350Hz SQZ (yellow BLRMS) does seem to be improved, but the high frequency SQZ did seem to be less stable as we thermalized.
[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:
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.
Code for analyzing this data
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:
LOG:
| Start Time | System | Name | Location | Lazer_Haz | Task | Time End |
|---|---|---|---|---|---|---|
| 15:17 | FAC | Nellie | MX | N | Technical Cleaning | 16:12 |
| 15:17 | FAC | Kim | MY | N | Technical Cleaning | 16:11 |
| 17:10 | FAC | Kim | H2 Building | N | Technical Cleaning | 17:18 |
| 17:43 | ISC | Mayank, Siva, Keita | OptLab | Yes | ISS Array work | 19:30 |
| 21:11 | ISC | Jennie, Mayank, Rahul, Keita, Sivananda | Optics Lab | Yes | ISS Array Work | 00:11 |
Sheila, Camilla, Jennie
This morning we changed SRCL offset from -191 to -306 and FC de-tuning from -34 to -28, as discussed in 83570. Took some SQZ data here as we were interested if we could get FIS SQZ lower than No SQZ ~100Hz and below, Sheila's models (e.g. 83572) suggest we should but it looks like there's a low frequeceny noise source (in FIS not FDS) in our data sets preventing us from getting down to the modeled level of SQZ.
Sheila turned OPO trans setpoint up from 80uW to 95uW to increase NLG from 11 to 19 (similar to what we had earlier in O4). Measured NLG with 76542. OPO gain left at -8. Turned off SQZ ASC.
| opo_grTrans_ setpoint_uW | Amplified Max | Amplified Min | UnAmp | Dark | NLG (usual) | NLG (maxmin) | OPO Gain |
| 95 | 0.0176 | 0.000279 | 0.00002 | 0.00094 | 19.1 | 20.0 | -8 |
| 110 | 0.03315 | 0.000269 | 0.000879 | -0.00002 | 35 | -8 |
| Type | Time (UTC) | Angle | Notes | DTT Ref |
| No SQZ | 03/29 | N/A | ref 0 | |
| FIS SQZ | 171 | Angle tuned for FDS (maybe thermalized since) | ref1 | |
| FIS SQZ | 17:05:00 | 154 | Ang tuned for FIS | ref2 |
| FIS Mid(ish) | 17:15:00 | 101 | Little better than no SQZ at 60Hz | ref3 |
| FIS Mid(ish) | 92 | ref4 | ||
| ASQZ FIS | 68 | ref5 | ||
| ASQZ FIS -10deg | 17:24:00 | 58 | ref6 | |
| ASQZ FIS +10deg | 78 | ref7 | ||
| FIS Mid(ish) | 17:31:30 | 115 | ref8 | |
| FIS Mid(ish) other side | 17:43:00 | 27 | ref9 | |
| FIS Mid(ish) | 17:45:30 | 82 | Check data doesn't include a glitch | ref10 |
| Type | Time (UTC) | Angle | Notes | DTT Ref |
| FIS ASQZ +10deg | 17:53:00 | 82 | Plot seems similar with same ang, different SRCL offset | ref 11 |
| FIS ASQZ | 17:56:00 | 72 | ref12 | |
| FIS ASQZ -10deg | 62 | ref13 | ||
| FIS Mid (ish) | 104 | Can see that rotation is a little different with SRCL de-tuning different but low freq noise level is the same. | ref14 |
| Type | Time (UTC) | Angle | Notes | DTT Ref |
| Mid SQZ | 112 | Interesting data here. Low freq noise higher than with NLG 19. | ref 15 | |
| ASQZ | 18:20:00 | 70 | ref16 | |
| MidSQZ | 18:22:30 | 100 | ref17 |
Sheila turned OPO trans back to 96uW so expect NLG to be 19 going into Observing, larger than normal but closer to the value uses before the last OPO crystal move. SQZ angle servo off and angle set back to 171. ADF left on.
Today during commissioning we increased the SQZ NLG from 11 to 19, now the nominal OPO trans setpoint in sqzparams in 95uW. This was because before our last OPO crystal move 82134, the NLG was closer to 17-19.
We also turned the ADF (322Hz line) back on, it had been off since March 27th 83621, tagging DetChar.
Sheila, Camilla
The IFO was just relocking at the start of commissioning time today, so we set the ADF back on and the sqz angle servo on. This worked fine, with the phase shifter staying well within it's range (it stayed between 180 and 130 degrees, it's range is 0 -270 degrees).
In the attached screenshot the vertical cursors are both at 25 minutes into the lock. You can see that the SQZ BLRMS and the range behave differently with the servo on, but in both cases they start with a low range and move up slowly. We think that the set point of the squeezing angle servo wasn't set ideally for this time.
In the second screenshot you can see that I changed the SRCL offset and the servo responded to it, taking about 3 minutes to settle.
Rahul, Betsy, Camilla
Attached are some photos of the proposed location of the beamdump that will be placed behind the HAM1 RM3 / PM1 tip-tilt with new D2500101 attached to existing Tip-Tilt DSUB Bracket Holder D1101430. In reality the beamdump will be placed at the mirror image of the photos as the HAM1 beam will be coming the opposite incoming angle.
The Beamdump is made from:
Lockloss right after we got back to OBSERVING with good range.
First impression of cause is that it might be wind related since:
Relocking again now.
Sheila, Camilla
Reduced HAM7 rejected pump power and increased SHG launch, turned OPO trans setpoint up to 120uW and measured NLG with 76542 to be 58 (this was a little lower than with 120uW in 83370). OPO gain turned down from -8 to -12. ADF was on for all apart from "Mean SQZ w/o ADF".
| Type | Time (UTC) | Angle | DTT Ref |
| No SQZ | 16:01:00 - 16:15:00 | N/A | ref 0 |
| SQZ | 16:56:30 - 16:59:30 | (CLF-) 174 | ref1 |
| SQZ +10deg | 17:00:00 - 17:03:00 | (CLF-) 184 | ref2 |
| SQZ -10deg | 17:03:30 - 17:06:30 | (CLF-) 164 | ref3 |
| Mean SQZ w/o ADF | 17:07:30 - 17:10:30 | N/A | ref4 |
| Mean SQZ w/ ADF | 17:11:00 - 17:14:00 | N/A | ref5 |
| Mid SQZ + | 17:17:00 - 17:20:00 | (CLF-) 209 | ref6 |
| Mid SQZ - | 17:21:30 - 17:24:30 | (CLF-) 152 | ref7 |
| ASQZ | 17:27:30 - 17:30:30 | (CLF-) 80 | ref8 |
| ASQZ +10deg | 17:31:30 - 17:34:30 | (CLF-) 90 | ref9 |
| ASQZ -10deg | 17:35:00 -17:38:00 | (CLF-) 70 | ref10 |
| Then went to FDS | |||
| FDS SQZ, SRCL -191 | 17:46:00 - 17:49:00 | (CLF-) 174 | ref11 |
| FDS SQZ +10deg, SRCL -191 | 17:49:30 - 17:51:30 (2mins) | (CLF-) 184 | ref12 |
| FDS SQZ -10deg, SRCL -191 | 17:52:00 -17:54:00 (2mins) | (CLF-) 164 | ref13 |
| FDS SQZ, SRCL -290 | 17:56:30 - 17:59:30 | (CLF-) 146 | ref14 |
| FDS SQZ +10deg, SRCL -290 | 18:00:00 - 18:02:00 (2mins) | (CLF-) 156 | ref15 |
| FDS SQZ -10deg, SRCL -290 | 18:02:30 - 18:04:30 (2mins) | (CLF-) 136 | ref16 |
| Starting FC detuning -36Hz | |||
| FDS SQZ, SRCL -290, FC detuning -40Hz | 18:08:30 - 18:11:30 | (CLF-) 146 | ref17 |
| FDS SQZ, SRCL -290, FC detuning -32Hz | 18:12:00 - 18:15:00 | (CLF-) 146 | ref18 |
| FDS SQZ, SRCL -290, FC detuning -32Hz | 18:18:00 - 18:21:00 | (CLF-) 149 | ref19 |
| FDS SQZ, SRCL -290, FC detuning -28Hz* | 18:21:30 - 18:24:30 | (CLF-) 149 | ref20 |
| FDS SQZ, SRCL -290, FC detuning -24Hz | 18:225:30 - 18:28:30 | (CLF-) 149 | ref21 |
| OPO trans back to nominal 80uW, NLG 12 | |||
| FDS SQZ, SRCL -290, FC detuning -28Hz | 18:46:30 - 18:49:00 (2m30) | (CLF-) 170 | ref22 |
| FDS SQZ, SRCL -191, FC detuning -36Hz | 19:03:30 - 19:06:00 (2m30) | (CLF-) 171 | ref23 |
* For NLG of 58, SRCL -290, FC detuning -28Hz looked best.
Plots attached of FIS data showing SQZ, Mean SQZ, Mid SQZ and also SQZ and ASQZ, filename shown on screenshot.
Also did FDS SQZ, +/-10deg with nominal SRCL detuning (-191) and -290, plot attached. And adjusted the FC de-tuning with SRCL offset at -290, plot attached.
Finally we went back to the nominal NLG (NLG of 12 with 80uW OPO Trans setpoint) and checked FDS SQZ with the best found settings at high NLG: SRCL -290, FC de-tuning -28Hz and back to nominal settings, DARM plot attached. We didn't have time to fully tune the angle in both settings so could repeat this to check at which settings the range is best. Sheila ran a SQZ angle scan at these settings (SRCL -290, FC de-tuning -28Hz), see attached, it is less frequency dependent than than the scans taken the day before at SRCL -191 (nominal) and -190, FC de-tuning -36Hz (nominal), plot attached.
| opo_grTrans_ setpoint_uW | Amplified Max | Amplified Min | UnAmp | Dark | NLG (usual) | NLG (maxmin) | OPO Gain |
| 120 | 0.0540944 | 0.00026378 | 0.000913452 | -0.0000233 | 57.75 | 58.68 | -12 |
| 80 | 0.010857 | 0.0002927 | 0.000904305 | -0.0000219 | 11.72 | 12.57 | -8 |
Here are some plots of Camilla's first dataset above, changing the SRC detuning while adjsuting the squeezing angle for high frequency squeezing, made with the same code used for 80318, which is available here
For the gwinc model, I've set the generated squeezing to 23 dB based on Camilla's measured NLG of 58. Based on the loss estimates from 83457, I've set the Injection loss to 0.178 (17.8% loss) and the PD efficiency (readout efficiency) to 0.815, and the phase noise to 0.
The third attachment shows the model where I've manually adjusted the SRC detuning to roughly match the subtracted squeezing, and the second shows a linear fit of SRCL offset to these detunings. This suggests that the SRCL offset should be at -306 counts to reduce the SRCL offset, and that we are currently running with a SRCL detuning of 0.013 radians.
This morning we put SRCL offset to -306, FC de-tuning -28Hz. I then ran SCAN_SQZANG which changed the angle form 171 to 161 and compare the before and after DARM, attached, SQZ looks alot better at higher frequencies, however the range, attached, is similar or a little worse, maybe the 300Hz (yellow BLRMs) squeezing is slightly worse.
Updated DTT legend as had typo.
Here are some preliminary plots from Camilla's data set of different squeezing angles taken at an NLG of 58 with the SRCL offset at it's nominal -191 counts setting, which we believe is about 13 mrad SRC detuning.
The first plot shows some assumptions that go into making this model, we start with an assumption about arm power, use the noise budget estimate of non quantum noise at 2kHz (which may be out of date now), and set the readout losses to fit the no squeezing data at 2.1-2.3kHz. Then subtract this quantum noise model without squeezing from the no squeezing data, and use that as an estimate of the non-quantum noise, which can be added to all of the quantum noise models for different squeezing angles to compare to the measurement. (second plot is a somewhat overwhelming plot of all this added for completeness).
I've set the phase noise to 0 based on 83457. Using the level of sqz and anti-squeeze at 2.1-2.3 kHz, we infer that the NLG was 63 and the total efficency was 66.5%. Camilla measured the NLG to be 58, for 120uW circulating power, but in 83370 she measured 61-63 for 120uW. The third plot here shows the data that Camilla took with the LO loop unlocked, so that the squeezing angle is averaging and rotating freely. Using this and knowledge of the NLG, we should be able to infer the total squeezing efficiency as a function of frequency. Doing the subtraction of non quantum noise increases the infered efficiency, (compare thick lines to thin), the two different values of NLG suggest rather different efficiencies. There is evidence that the efficiency frequency dependent, which could be caused by a number of effects. Below 200 Hz there is some excess noise in the mean sqz trace, as you can see here, which causes the efficiency infered to be above 1.
The next two plots show the model broken into more readable plots, with the only thing I've adjusted by hand being the SRC detuning. There is a discrepancy between the model + noise for the anti-squeezing and anti-squeezing +/-10 degrees traces without the filter cavity, which seems like it could be some excess noise that is similar for the different traces. This is similar to the discrepancy seen in the last plot in 82097, but it is larger in this higher NLG dataset.
Alarms has been reconfigured to expect GV2 and GV5 to be in the hard-closed position and alarm if not.
Added PT114 (CP1)
Bypass will expire:
Tue Apr 1 12:40:00 PM PDT 2025
For channel(s):
H0:FMC-CS_FIRE_PUMP_1
H0:FMC-CS_FIRE_PUMP_2
H0:VAC-LY_Y3_PT114B_PRESS_TORR
Added GV5 position alarm to bypass
H0:VAC-LY_GV5_ZSM159A_VALVE_ANIM
We are getting multiple VACSTAT alarms as gatevalves are being closed, so for now I've bypassed those cell phone alarms.
H1:CDS-VAC_STAT_GLITCH_DETECTED