Workstations were updated and rebooted at about 1415 UTC. This was an os packages update. Conda packages were not updated.
This morning I took down and then moved the laser curtains around the two laser tables next to HAM1/2. I didn't fully disassemble them, but "accordion folded" them and then propped them up along the South wall of the West bay, a bit West of the TCSY table. Robert gave the OK with them propped up on the wall for our last 2 weeks of observing.
TITLE: 03/18 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 10mph Gusts, 6mph 3min avg
Primary useism: 0.04 μm/s
Secondary useism: 0.23 μm/s
QUICK SUMMARY:
When I walked in, H1 was in Move_Spots[508].
I don't think we were going to make it all the way to NLN before the Injections start but I will let it continue to lock until it is unlocked by activiites today or 8pm.
Well we made it all the way to Observing before 14:50 UTC.
I see I have some red on CDS overview:
H1SUSPROCPI has a pending config.
We have a 6 hour Maintenance day today!
Notes:
PCAL team and anyone else in the End stations needs to keep cellphones away from VAC Cold Cathode; airplane
mode may be desired.
Tripping Hazard near HAM6: a cable tripping hazard near HAM6 when Robert starts working over near the output arm.
Expected work:
LVEA:
Ham1 Laser Barrier taken down?
Lighting?
Fil HAM1 pulling cables.
Vac roughing pumps & compressor
EX:
PCAL ES Beam Mv over by 9am
Laser hazard Camilila & TJ TMS
Oplev
EY:
Oplev work Rahul
Vac EY comp
CDS:
Dan LDAS maint.
Eric BS camera server testing
I loaded Oli's new h1susprocpi PI_PROC_COMPUTE_MODE[24,31]_BP filters at 08:11 PDT.
TITLE: 03/18 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 149Mpc
INCOMING OPERATOR: Oli
SHIFT SUMMARY: Extremely quiet shift with H1 observing throughout and has been locked for just over 10 hours. Range slightly lower this lock due to different SQZ angle?
TITLE: 03/17 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 151Mpc
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY: I restarted standdown_alerts around ~15:30 UTC this morning after it died overnight, igwn_alert died with the network issues (GraceDB error) and I restarted that around 18:30 UTC. Yellow dust alarms in the optics lab throughout the day.
LOG:
Start Time | System | Name | Location | Lazer_Haz | Task | Time End |
---|---|---|---|---|---|---|
15:16 | FAC | Kim | Optics, VAC prep | N | Tech clean | 15:39 |
15:37 | PEM | Robert | LVEA | N | Measurement prep | 15:46 |
15:41 | ISC | Corey | Optics lab | N | Optics parts search | 16:36 |
15:46 | SQZ | Sheila | LVEA, SQZT1 | LOCAL | SQZT1 work | 16:42 |
16:55 | FAC | Nellie | Midx | N | Tech clean | 18:03 |
16:55 | FAC | Kim | MidY | N | Tech clean | 18:00 |
17:17 | FAC | Chris | Staging to Xarm | N | Big green tumbleweed clearing | 18:56 |
17:31 | FAC | Mitch | LVEA | N | Measure rollup door width | 17:34 |
17:49 | ISC | Sheila | LVEA | LOCAL | Measure POP power | 18:29 |
18:35 | PEM | Robert | LVEA | N | Turn off injections | 18:39 |
20:04 | SEI | Mitch, Jim | MidY | N | Prep for tomorrows work | 20:52 |
20:51 | ISC | Camilla | Optics lab | N | Collecting parts | 21:32 |
22:27 | ISC | Camilla | Optics lab | N | Parts put away/ finding parts | 22:43 |
23:18 | SUS | Keita | Optics lab | N | ZM tiptilt sus investigation | Ongoing |
CAL sweep ESD Observations:
While checking the ESDs for saturations during the CAL Sweeps I found this signal shape during a CAL Sweep that we survived.
I can see there are different sections to the CAL sweep, and we tend to lose lock on this last section which is a 1200Hz signal.
While zooming in we can see a 40Hz oscillation that is ontop of the 1200hz injection.
There are multiple Locklosses in this section of the CAL Sweep, but there seems to be a common 40ish Hz oscillation on top of the 1200Hz that apears when we loose lock, But not when we survive it.
I am aware that there is an alog 82827 that mentions a 43.75 hz signal... which may need to be look into as the source of this oscillation.
Perhaps I should try to figure out what frequencies are being injected during the CAL sweeps.
TITLE: 03/17 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 148Mpc
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 10mph Gusts, 4mph 3min avg
Primary useism: 0.03 μm/s
Secondary useism: 0.22 μm/s
QUICK SUMMARY: H1 has been locked and observing for just over 4 hours.
Sheila, Elenna
This morning while we were relocking I did a repeat of the POP air power measurements with 2W input power into the IFO, similar to what was done in 82942, this time the powers are rather different and are closer to expectations for HAM1 powers (with settings on the power meter verified).
Implied power in the PRC at 2W input power time:
power measured |
counts before any calibration is applied (INMON) |
what I think this diode's calibration should be | currently calibrated value of this diode | |
after 90/10 BS | 1.6mW | |||
before POP X (POP X SUM) | 0.83mW | 940 | 0.88 uW/ count | no calibration applied |
before POPAIR B | 0.22mW | 141 | 1.56uW/count | no calibration applied |
POPAIR A diode | 0.22mW infered from POPAIR B meas | 10.9 | 20uW/count | 55uW |
POP in vac diode | 260 | 1054uW |
With regards to the upcoming HAM1 vent and placement of an in-vac POP WFS, I think these results indicate that we can have ~30 mW of power on the in-vac POP WFS. At 2 W of input power, Sheila measured 0.8 mW on the POPX WFS. At 60 W input, there should be about 24 mW on the POPX WFS.
Daniel made a similar conclusion here.
FAMIS 31077
Nothing much to report this week; trends are looking stable.
J. Kissel I attach updated figures from the SPI Conceptual Design Document (G2301177) slides on the the expected performance of the SPI w.r.t. the HAM2-HAM3 ISI system for the purposes of the Final Design Document (T2400145). These "final answer" figures are attached as .pngs, attached in L, P, Y order. For posterity I attach a .pdf which shows the entire plot series from the code (${SeiSVN}/seismic/Common/SPI/Scripts/plot_spi_motivation_20250314.m). "The code" is an updated version of that from LHO:70306. Really, the only updates are to use the modern version of each of the SPI's DOF's noise budget, most recently documented in LHO:12273. Please revisit LHO:70306 if you'd like to understand the estimate of the ISI platforms; that has not changed at all, as we have not made substantial performance improvements to the HAM2 - HAM3 ISIs since (remember, O4 started in June 2023 and is on-going today.) DISCUSSION A brief bit of discussion about the changes in SPI noise budget: SPI LONG: (See first .png, or page 20 of the .pdf plot series) The modern modeled SPI longitudinal IFO performance is worse below 0.5 Hz, where the model now includes a real estimate of the frequency noise of its laser source -- which is now the PSL (with frequency noise from LHO:73976) rather than what was proposed in the conceptual design phase; an independent laser source with (0.01 * free-running NPRO frequency noise) = 1 [Hz/rtHz] * (100 [Hz] / f). For that same reason, it's better above 0.5 Hz, and the limit is instead the next noisiest source in the modern design -- ADC noise. SPI PIT/YAW: (See second .png and third .png or pages 9 and 15 of the .pdf plot series) The modern modeled SPI Pitch / Yaw optical lever performance is split into two curves: - one for spot size of 5 mm at the "reflector" ISI (i.e. the spot size at "ISIJ," which is HAM2 in this pathfinder instantiation, after having diverged over the ~16 [m] traverse and measured by "QPDA"), and - one for spot size of 1 mm at the "transceiver" ISI (i.e. the spot size at "ISIK," which is HAM3 in this pathfinder instantiation, after having been refocused to the original transmitted size by the ~16 [m] ROC reflector on HAM2 and measured by "QPDB" on the HAM3 transceiver.) The CDD's model did not account for the spot size increase, so it was essentially the 1 mm spot size model. The changes in 1 mm spot size model from CDD to FDD are (1) an updated [whitened] ADC noise curve, showing an improvement below 0.3 Hz, and (2) the addition of an estimate for the shot noise on the QPD, which makes the >30 Hz performance slightly worse. Both the 1 mm and 5 mm modern estimates are limited by ADC noise across the entire frequency band. CONCLUSION My interpretation of the plots -- regardless of these changes to each DOF of the expected SPI performance, comparing these against the estimate of the June 2023 performance of the HAM2-HAM3 ISI system, the conclusions from the conceptual design remain: we still expect the pathfinder to provide a range of "interesting" (YAW) to "delightful" (PIT, LONG) amount of improvement to the system; more-so in some regions and less in others. We look forward to making these plots with a real measured system rather than a model!!
17:08 EQ mode activated, nothing on USGS or EMSC so it might have been some local event?
17:09 UTC lockloss
Last week CDS tried to switch all the remaining cameras to the new camera server with new code (alog83308). We ended up reverting this change since it introduced an offset into the cameras that we use in full lock - BS, ETMs. We switch over to these cameras in the ADS_TO_CAMERAS state, as one of the last things we do before low noise.
Sheila's idea to implement these new camera offsets introduced by the new code is to switch to the new server after we get to almost full lock, and then account for these offsets to bring us back to our previous position. In order to for this to work, the position of the camera inputs would need to be consistent lock to lock, otherwise we run the risk of adding in a manual offset to an odd place from that particular lock. Looking back at the last week or so, we are very consistent before we switch to the camera servo (attachment1 as example). Next steps are to coordinate with CDS to try this during the tail end of maintenance day or another opportunity.
Mon Mar 17 10:12:55 2025 INFO: Fill completed in 12min 52secs
Gerardo confirmed a good fill curbside.
Mayank, Sheila, Camilla
After the adjustments to the ADF SQZ phase servo 83381, we had some issues will it railing at the start of the lock, so it was turned off 83393.
Today Sheila re-cabled the phase at the SQZ racks so that we're now using RF3 rather than RF6. The expectation is that the ADF phases we set are changing with thermalization and RF3 should have the ADF I and Q signals centered on zero with no offsets. The SQZ angle is still controlled via the same RF6 medm channels but its really adjusting the 3MHz.
After this we turned off the H1:SQZ-ADF_OMC_TRANS_DEMOD_{I,Q}_OFFSET and put H1:SQZ-ADF_OMC_TRANS_Q_NORM back from 4.5 to 1. Then we scanned the SQZ angle with ezcastep H1:SQZ-CLF_REFL_RF6_PHASE_DELAYSTEP -s 15 '+74,28' and H1:SQZ-CLF_SERVO_IN2POL sign NEGATIVE to get a new data set to fit to. For good SQZ, CLF sign left at negative with SQZ angle at 185deg.
TITLE: 03/17 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 151Mpc
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 3mph Gusts, 2mph 3min avg
Primary useism: 0.02 μm/s
Secondary useism: 0.25 μm/s
QUICK SUMMARY:
TITLE: 03/17 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 152Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY: Very quiet shift with H1 observing since getting relocked. Currently have been locked for 4.5 hours.