david.barker@LIGO.ORG - posted 10:22, Saturday 30 August 2025 (86653)
Sat CP1 Fill
Sat Aug 30 10:08:29 2025 INFO: Fill completed in 8min 25secs
Images attached to this report
Sat Aug 30 10:08:29 2025 INFO: Fill completed in 8min 25secs
TITLE: 08/30 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 156Mpc
OUTGOING OPERATOR: Tony
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 1mph Gusts, 0mph 3min avg
Primary useism: 0.01 μm/s
Secondary useism: 0.13 μm/s
QUICK SUMMARY:
Observing at 156 Mpc and have been Locked for over 13.5 hours.
Early this morning at 10:24 UTC we had Superevent S250830bp come in on Tony's OWL
TITLE: 08/30 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 157Mpc
INCOMING OPERATOR: Tony
SHIFT SUMMARY: One lockloss with an easy recovery, we've been locked for 4 hours.
LOG: No log.
01:01 UTC Observing
03:27 UTC Superevent S250830m
I processed the OPLEV charge measurments that Rahul took on the 26th.
The charge on ETMY looks stable and low. The charge on ETMX appears high, the error bars are quite large but even with those each quadrant has increased since the last measurement.
23:31 UTC lockloss
01:01 UTC Observing
TITLE: 08/29 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 154Mpc
INCOMING OPERATOR: Ryan C
SHIFT SUMMARY:
IFO is (still) in NLN as of 21:48 UTC Aug 28 (25 hrs 30 mins) and OBSERVING
Nothing has changed in the last 9 hours.
LOG:
| Start Time | System | Name | Location | Lazer_Haz | Task | Time End |
|---|---|---|---|---|---|---|
| 17:14 | OPT | Jeff | Optics Lab | Local | SPI Inventory and Photography | 17:57 |
| 20:52 | OPT | Camilla | Optics Lab | Local | Class B Part Work | 21:31 |
TITLE: 08/29 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 151Mpc
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 7mph Gusts, 4mph 3min avg
Primary useism: 0.01 μm/s
Secondary useism: 0.06 μm/s
QUICK SUMMARY:
Fri Aug 29 10:08:32 2025 INFO: Fill completed in 8min 29secs
Gerardo confirmed a good fill curbside.
TITLE: 08/29 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 142Mpc
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 2mph Gusts, 1mph 3min avg
Primary useism: 0.01 μm/s
Secondary useism: 0.05 μm/s
QUICK SUMMARY:
IFO is in NLN and OBSERVING as of 00:40 UTC (and locked for16hrs 50min)
IFO has been in NLN the whole night with no drops from OBSERVING in that time.
TITLE: 08/29 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 151Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY: We've been locked for over 7 hours, the violins are coming down (ITMY 5/6).
LOG: No log
Here's a quick look at ASC signals with different configurations of the SR3 and PR3 estimators on and off. I decided to plot two comparison times with everything on to see what changes are due to the estimators and what might be due to just a bad time selection. I still need to compare to another time with all estimators off to confirm that noise decreases are due to the estimator and not other factors. Because we only have the one comparison time right now for the Estimators OFF time, any improvements in noise seen are tentative and not for sure yet.
Comparison times:
2025-08-28 18:58 UTC - P&Y estimators for both SR3 and PR3 OFF (RED)
2025-08-28 15:15 UTC - Only SR3 P&Y Estimators ON (BLUE)
2025-08-28 20:12 UTC - Both SR3 P&Y and PR3 P&Y Estimators ON (GREEN)
2025-08-28 22:00 UTC - Both SR3 P&Y and PR3 P&Y Estimators ON (BROWN)
CHARD
CHARD_P_OUT
- Not much change
CHARD_Y_OUT
- Peaks around 3 Hz are maybe a bit more pronounced than before
DHARD
DHARD_P_OUT
- Possibly lower noise 4-6 Hz?
DHARD_Y_OUT
- Not much change
INP1
INP1_P_OUT
- Possibly some improvement between 2-3 Hz?
INP1_Y_OUT
- Noise worse around 3 Hz?
MICH
MICH_P_OUT
- Noise much worse between 0.6-0.9 Hz
- Noise much worse between 2.5-5 Hz
MICH_Y_OUT
- Noise better 1.5-3 Hz?
PRC2
PRC2_P_OUT
- Broadband decrease in noise 1-7 Hz?
PRC2_Y_OUT
- Decrease in noise 3-6 Hz?
SRC1
SRC1_P_OUT
- 2.5 Hz peak lowered??
SRC1_Y_OUT
- Really good reduction in noise according to GREEN between 1.5-2.5 Hz?
SRC2
SRC2_P_OUT
- Possibly lower noise 4-6 Hz?
SRC2_Y_OUT
- Possibly lower noise 4-6 Hz?
TITLE: 08/28 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 153Mpc
INCOMING OPERATOR: Ryan C
SHIFT SUMMARY:
Comissioning was cut short due to an ill timed Lockloss during the Calibration Simuline sweep.
Vacuum team is running a pump in their Vac Lair for about an Hour starting around 18:30 But they stopped before NLN.
Jeff and Robert got a few tests done today from 1900-1930 UTC
NLN reached at 19:06 UTC
Back to observing at 19:30:43 UTC
Another Lockloss at 20:37:23 UTC
Back to Observing at 21:51 UTC, But there was an interesting PR3 SDF Diff that was going to wake up the OWL Shift. so we dropped to commissioning at 21:51 UTC.
Back to Observing at 21:53 UTC.
Elenna found the Issue and loaded ISC_ LOCK which took us back down to commissioning again for 2 secs at 22:00:29 UTC.
and Finally Back to Observing again at 22:00:31 UTC.
GRB-Short E595035
LOG:
| Start Time | System | Name | Location | Lazer_Haz | Task | Time End |
|---|---|---|---|---|---|---|
| 15:01 | FAC | Kim & Nellie | Receiving | N | Loading cart | 15:31 |
| 15:01 | PEM | Robert | LVEA | N | Setting up shakers | 15:48 |
| 16:00 | FAC | Kim | Optics lab | N | Technical Cleaning | 16:30 |
| 16:29 | EE | Marc | LVEA | N | Looking for tools. | 16:36 |
| 16:37 | SUS | Betsy | LVEA Highbay | N | Getting parts. | 16:22 |
| 16:47 | PEM | Robert | LVEA | N | Settign up PEM equipment for Acoustic injections | 18:16 |
| 18:58 | SUS | Jeff | Control Rm | N | PR3 Estimating | 19:30 |
| 19:08 | PEM | Robert | Control RM & LVEA | N | Running sweeps through 10 - 40 hz | 19:28 |
| 20:59 | Cbex | Tyler & CBEX | Mid Y | N | Geo Survey | 23:59 |
| 22:12 | VAC | Anna & Janos | Mid X | N | Taking measurements and checking on 343B Pump | 22:42 |
| 23:08 | EE | Marc | Optics lab | N | Making connector | 23:53 |
TITLE: 08/28 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 150Mpc
OUTGOING OPERATOR: Tony
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 11mph Gusts, 7mph 3min avg
Primary useism: 0.02 μm/s
Secondary useism: 0.06 μm/s
QUICK SUMMARY:
00:35 - 00:40 UTC We dropped Observing from the SQZ PMC losing lock and relocking.
Lockloss from Nominal Low Noise caused by an ETMX glitch.
Last checked in alog85994, closes FAMIS26554.
Both BRS X & Y are within range.
Today we pushed calibration report 20250823T183838Z, which updates the calibration model after changes to the actuation (ESD bias change) and sensing (SRC alignment offset change).
These are the steps I took (and two mistakes I made):
pydarm report --regen 20250823T183838Z with the ESD bias and drivealign L3 L2L gains updated in the ini file. I checked to make sure the results were sensible. There is a change in the sensing function at low frequency, probably from an L2A2L related change.
pydarm report --regen 20250823T183838Z to get the GDS filters, checked the GDS filters to ensure they looked normalpydarm commit 20250823T183838Z --valid --message 'new calibration push, new ESD bias and SRC ASC offsets'pydarm export --push 20250823T183838Zpydarm upload 20250823T183838Zpydarm gds restart
H1:CAL-CS_DARM_FE_ETMX_L3_DRIVEALIGN_L2L_GAIN had not been updated with the new drivealign gain. Once I updated it, CAL DELTA L then looked correct
The attached plot compares the before and after PCAL broadband to GDS CALIB STRAIN. Tony will post the usual alog about the simulines measurement once it is complete.
Sadly, we lost lock mid-simulines measurement. However, the broadband pcal measurement showed success, so we are happy to keep this calibration and we will (hopefully) get simulines Saturday.
Here is the same plot as above, except with PCAL/GDS instead of GDS/PCAL.
We've had two locks since this push, and it appears the systematic error during thermalization is even lower than it was before. We updated the SRCL offset during thermalization, partially because it reduces the systematic error. It appears we do not need to update the thermalization servo, as the systemic error of the 33 Hz line is 2% or less during thermalization.
(Jordan V., Tony S., Gerardo M.)
Late entry
To get the gauge working at the filter cavity tube cross C7 we pulled the EtherCAT cable from cross C7 to cross D1, this allowed us to daisy chain the gauges at both crosses. To land the EtherCAT cable both ends were terminated, thanks Tony. To get power to the gauge we used one of the outlets in the filter cavity enclosure and a small din rail mountable power supply, the supply provides 24 VDC. Patrick took care of the software, see his aLOG here.
Currently we have the following items valved out along the filter cavity, two ion pumps;IPFCC6, IPFCC8, and the gauge PTCC7. We plan to incorporate them to the main vacuum volume on the next couple of weeks. Pressure at the gauge is low, thus we need to pump its volume down using an aux cart and a small turbo pump.
Last tuesday I was able to valve in the last two ion pumps into the filter cavity tube envelope, two of the 10" isolation valves at section C were closed to achieve this, then as the internal pressure of the filter cavity tube settle the isolation valves were opened.
Something to note with the performance of the HV cable for IPFCC8 (ion pump a the filter cavity cross 8) is a bit noisy, I noticed that the controller got noisy when I touched the HV cable, but will check both at a later time, maybe cable, grounding and/or controller issue.
(Anna I., Jordan V., Gerardo M.)
Last tuesday we valved in a gauge to the filter cavity tube vacuum volume.
We pumped the dead volume down until the pressure reached high 10^-07 torr, then introduced the gauge to the "short" volume of the filter cavity tube, we had closed two isolation valves, we waited about 10 minutes, then the isolation valves were opened. No issues to report.
