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Reports until 15:38, Monday 10 February 2025
H1 ISC (DetChar, ISC, OpsInfo)
sheila.dwyer@LIGO.ORG - posted 15:38, Monday 10 February 2025 - last comment - 12:26, Tuesday 11 February 2025(82728)
low frequency nonstationary noise returned

Sheila, Matt Todd

We are having more incidences of the nonstationary noise 20-60 Hz that correlates with the CO2 ISS channel. 

Here's a collection of links related to this issue in the past: 

Here is a Lasso result for the noisy lock from this weekend: lasso Feb 9. Jane Glanzer is working on running lasso for some of the recent noisy times including the max as well as mean channels, so that may provide additional clues. We still see the ITMX CO2 ISS channel correlated with range.  Note, on Feb 7th Lasso chooses  H1:IOP-OAF_L0_MADC2_EPICS_CH15 which is the same thing as ITMX_CO2_ISS_CTRL2_INMON,

For the 9th the Rayleigh statistic also clearly shows this issue: summary page for Feb 9th, but comparing this to one of our normal days (range just below 160 and stable on Feb 4th) we also see nonstationarity at these frequencies.  So, it is possible that we normally have this non stationary noise at a lower level and it is always limiting our sensitivity.

Feb st we had an incident where the ISS CO2 channel was correlated with the range, screenshot.  Feb 1st there was also a remarkable change in the FC length control signal peak to peak, which has not shown any correlation with these range drops in the last week and a half, but did last may (78485).  Matt found this alog about squeezer issues on the 1st, 82581, we adjusted the SHG temperature, and fiber polarization, and there was a temperature excursion in the FCES. The FC length control signal was noisy from Jan 2nd to Feb 1st, and has been back to normal since. 

Operator request:  If operators see the range fluctuating with lots of noise between 20-40 Hz, (similar to Feb 9th), could you drop out of observing and go to no squeezing for 10 minutes or so?  We would like to see if this problem comes and goes with squeezing as it did last May. 

 

 

Images attached to this report
Comments related to this report
jane.glanzer@LIGO.ORG - 12:26, Tuesday 11 February 2025 (82748)DetChar

I have run lasso for four different time periods as suggested by Sheila. As mentioned, these lasso runs differ from a traditional run in that I am using .max trends of the auxiliary channels to model the bns range. Below are links to each run, along with brief comments on what I saw.

Feb 1st 10:20 - 18:40: The top channel is a SQZ channel, H1:SQZ-PMC_TRANS_DC_NORMALIZED.  H1:ASC-POP_X_RF_Q4_OUTPUT and H1:TCS-ITMX_CO2_ISS_CTRL2_OUT_DQ were also picked out. The CO2 channel is correlated with the bigger dip around ~15 UTC.

Feb 7th 12:21:58 - 15:17:03: For some reason, lasso only runs until 15 UTC, when I have specified it run until 18:30 UTC. I am not 100% sure why this happens. I think it may be because of a large range drop around 15 UTC. I have still included what lasso found for the initial  3 hours or so. Some top channels picked out are H1:SUS-ITMY_M0_OSEMINF_F2_OUT16 & H1:ASC-AS_A_RF45_Q2_OUT16. These are new channels that I don't think have been picked out before. I will say that farther down the list of correlated channels H1:PSL-ISS_SECONDLOOP_QPD_SUM_OUT16.

Feb 7th 21:55:32 - Feb 8th 01:40:00: Top channel is H1:TCS_ITMX_CO2_ISS_CTRL2_OUT_DQ.

Feb 9th 07:04:07 - 11:59:26: Top correlated channels are H1:PSL-ISS_SECONDLOOP_PDSUMOUTER_INMON & H1:TCS-ITMX_CO2_ISS_CTRL2_OUT_DQ. These are also the top two channels from the regular lasso run (with .mean trends) as viewed from the summary pages.

The most consistently picked out channel is the ITMX_CO2 channel, but the .max trend method also seems to pick up some PSL, SQZ, SUS, and ASC channels as well.
 

H1 General
ryan.crouch@LIGO.ORG - posted 15:28, Monday 10 February 2025 (82729)
OPS Monday EVE shift start

TITLE: 02/10 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 156Mpc
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 7mph Gusts, 4mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.39 μm/s
QUICK SUMMARY:

LHO General
thomas.shaffer@LIGO.ORG - posted 13:41, Monday 10 February 2025 (82716)
Ops Day Shift End

TITLE: 02/10 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 155Mpc
INCOMING OPERATOR: Ryan C
SHIFT SUMMARY: Commissioning this morning and a few lock losses. The PR2 spot was moved again so the lock reacquisition was slower since Sheila needed to pico for POP QPDs. Other than that relocking has been automated.
LOG:

H1 General
ryan.short@LIGO.ORG - posted 13:23, Monday 10 February 2025 (82727)
H1 Back to Observing

H1 back to observing at 21:18 UTC following commissioning time. Were getting some DIAG_MAIN notifications after going to max power about the POP X PZT being railed; Sheila says we should fix this but can wait for now. The TMS_SERVO Guardian has a note about this being due to different PR3 alignment.

Accepted new POP_A offsets of 0 in ASC OBSERVE.snap table once at NLN (screenshot attached).

Images attached to this report
H1 SUS (SEI, SUS)
joshua.freed@LIGO.ORG - posted 13:18, Monday 10 February 2025 (82726)
ETMX BOSEM Noise Injections

J. Freed

ETMX shows strong coupling of BOSEM noise between 10-20Hz by about a factor of 30 below DARM from most sensors.

Today I did damping loop injections on all 6 BOSEMs on the ETMX M0. This is a continuation of the work done previously for ITMX, ITMY, PR2, PR3, PRM, SR2, SR3, and SRM. As with PRM, gains of 300 and 600 were collected for SR3 (300 is labled as ln or L).  Calibration lines were off.

The plots, code, and flagged frequencies are located at /ligo/home/joshua.freed/bosem/ETMX/scripts. While the diaggui files are at /ligo/home/joshua.freed/bosem/ETMX/data for ETMX. I used Sheila code located under /ligo/home/joshua.freed/bosem/ETMX/scripts/osem_budgeting.py to produce the sum of all contributions as well as the individual plots.
 
ETMX.png Is a plot of ETMX estimated contributions to DARM using only the 600 gain data. All F sensors have a strang effect.
main.png Shows the current noise plot for most of the suspensions done so far
 
reference number in diaggui files for ETMX
Background time: (ref0 DARM, ref1 F1_out, ref2 F2_out, ref3 F3_out, ref4 LF_out, ref5 RT_out, ref6 SD_out)
F1L time:                (ref7 DARM, ref8 F1_out)
F1 time:                  (ref9 DARM, ref10 F1_out)
F2L time:               (ref11 DARM, ref12 F2_out)
F2 time:                 (ref13 DARM, ref14 F2_out)
F3L time:              (ref15 DARM, ref16 F3_out)
F3 time:                (ref17 DARM, ref18 F3_out)
LFL time:              (ref19 DARM, ref20 LF_out)
LF time:                (ref21 DARM, ref22 LF_out)
RTL time:              (ref23 DARM, ref24 RT_out)
RT time:                (ref25 DARM, ref26 RT_out)
SDL time:             (ref27 DARM, ref28 SD_out)
SD time:               (ref29 DARM, ref30 SD_out)

 

Images attached to this report
H1 ISC (PEM)
jennifer.wright@LIGO.ORG - posted 11:22, Monday 10 February 2025 - last comment - 13:06, Monday 10 February 2025(82722)
PR2 moves today out of lock during Commissioning

Sheila, Matt T, Mayank, Jennie W

 

tl;dr: After previous PR2 moves last week, we measured the spot clipping on scraper baffle (and exiting HAM3 viewport) to be 8mW in lock. After measuring this we unlocked for unknown reason and so team PR2 moved 6mm towards the centre of PR2 in yaw while unlocked. We estimate we are roughly centred on PR2 now.

Today Sheila and I measured the spot coming out of the HAM3 viewport as was done by Robert in this entry. The process is replace the black glass guillotine with lexan guillotine, take off the illuminator, clip a lens on a stalk to the top of the guillotine and align this with the beam coming out of the viewport. Not all the light is now captured by the lens as the spot is now more a semi-circle of a clipped beam. We moved the power metre behind the lens till we found the max power we could get on the power metre. This was 8mW and the PR3 yaw slider was at around -74 microradians.


After we came back to control room the IFO lost lock so it was decided to move towards the centre of PR2 which had been measured by Sheila using an A2L measurement at the start of the commissioning period.

Matt tuned down on PR3 yaw in 3 microradian steps to -232.4 microradians. Each step he tuned the 8X picomotor to bring back the DIFF and COMM ALS beatnotes. Every so often it is also neccessary to step up the pitch on PR3 to compensate for the cross-coupling of yaw to pitch. The ndscope image for the moves is here. Matt left the picomotor like this and the sliders like this.

Images attached to this report
Comments related to this report
sheila.dwyer@LIGO.ORG - 13:06, Monday 10 February 2025 (82725)

Before today's move PR3 yaw slider was at -74, where we measured the Y2L coefficent to be -3, which corresponds to 6 mm. 

We moved using the procedure in 82670, and we decided to move to -230urad on the PR3 yaw slider based on the table in 82688

We did go to ISCT1 ad fix up the beatnotes, and TJ stopped at PREP_DC_READOUT where I pico'd to center on the POP QPDs.  The centering actually could be better, with POP A well centered POP B is at -0.5 in pitch and -0.1 in yaw at 2W with all ASC on.  We can fix this another day, but didn't want to take the time today.

I've set the POP A offsets to 0, accepted this in safe.snap, and added PRC1 and PRC2 in the guardian.

H1 PSL
ryan.short@LIGO.ORG - posted 10:57, Monday 10 February 2025 (82721)
PSL 10-Day Trends

FAMIS 31072

Since our work in the enclosure last week taking pump diode slope measurements (alogs 82636 and 82635), several trends have changes. A majority of the pump diode monitors are at different levels, power out of both amplifiers is higher (AMP2 seems slightly noisier), PMC transmitted power is higher, PMC reflected power is lower and has not been increasing since last week. This is the first time I can recall it not having a steady increase since immediately after the last NPRO swap late last year.

Images attached to this report
LHO VE
david.barker@LIGO.ORG - posted 10:21, Monday 10 February 2025 (82720)
Mon CP1 Fill

Mon Feb 10 10:18:24 2025 INFO: Fill completed in 18min 21secs

Gerardo confirmed a good fill curbside. TCmins [-38C, -37C] OAT (-3C, 26F) DeltaTempTime 10:18:24

Images attached to this report
H1 General
thomas.shaffer@LIGO.ORG - posted 10:20, Monday 10 February 2025 (82719)
Lock loss 1807 UTC

1423246039

The lock loss occurred during commissioning time but no activity was going on at the time.

LHO General
thomas.shaffer@LIGO.ORG - posted 07:32, Monday 10 February 2025 - last comment - 07:55, Monday 10 February 2025(82713)
Ops Day Shift Start

TITLE: 02/10 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Aligning
OUTGOING OPERATOR: Ryan S
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 11mph Gusts, 6mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.32 μm/s
QUICK SUMMARY: Recent lock loss, IFO just finished up an initial alignment. Planned commissioning today from 1630-1930 UTC.

Comments related to this report
thomas.shaffer@LIGO.ORG - 07:49, Monday 10 February 2025 (82714)VE

There was a vacstat alarm this morning, attached is the blip it alarmed off of. The height of this peak seems fairly normal when trending back, happening once every few days or so. It also doesn't coincide with a lock loss, we were in low noise during this time.

Images attached to this comment
david.barker@LIGO.ORG - 07:55, Monday 10 February 2025 (82715)

We had a BSC3 gauge glitch at 00:59:17 which caused the VACSTAT alarm. I have restarted the service to clear it.

Images attached to this comment
H1 General
ryan.crouch@LIGO.ORG - posted 22:00, Sunday 09 February 2025 (82712)
OPS Sunday EVE shift summary

TITLE: 02/10 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 156Mpc
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY: After relocking we stayed locked the whole shift. 6 hours as of 06:00UTC, the range has been fairly stead just under 160 Mpc.
LOG: No log

00:00 UTC Observing

00:55 - 01:35 UTC We survived some earthquakes, 5.9, 5.4, 4.9 from the Soloman islands area

H1 General
ryan.crouch@LIGO.ORG - posted 15:03, Sunday 09 February 2025 (82710)
OPS Sunday EVE shift start

TITLE: 02/09 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 9mph Gusts, 4mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.22 μm/s
QUICK SUMMARY:

H1 General
thomas.shaffer@LIGO.ORG - posted 14:42, Sunday 09 February 2025 - last comment - 16:01, Sunday 09 February 2025(82709)
Lock loss 2229UTC

1423175398

The quad L2 outs seem to see it first?

Images attached to this report
Comments related to this report
ryan.crouch@LIGO.ORG - 16:01, Sunday 09 February 2025 (82711)

00:00 UTC Observing

H1 TCS (TCS)
corey.gray@LIGO.ORG - posted 17:51, Wednesday 05 February 2025 - last comment - 09:41, Monday 10 February 2025(82659)
TCS Monthly Trends (FAMIS #28457)

Attached are monthly TCS trends for CO2 and HWS lasers.  (FAMIS link)

Comments related to this report
corey.gray@LIGO.ORG - 09:41, Monday 10 February 2025 (82717)TCS

Whoops!  Forgot to attach the actual trends!! (thanks for catching this, Camilla!)  Attachements are now attached!

Images attached to this comment
H1 ISC
elenna.capote@LIGO.ORG - posted 12:17, Wednesday 05 February 2025 - last comment - 14:28, Tuesday 11 February 2025(82656)
Quick check of POP A LF calibration

Sheila and I are continuing to check various PD calibrations (82260). Today we checked the POP A LF calibration.

Currently there is a filter labeled "to_uW" that is a gain of 4.015. After some searching, Sheila tracked this to an alog by Kiwamu, 13905, with [cnts/W] = 0.76 [A/W] x 200 [Ohm] x 216 / 40 [cnts/V]. Invert this number and multiply by 1e6 to get uW/ct.

Trusting our recalibration of IM4 trans, we have 56.6 W incident on PRM. We trust our PRG is about 50 at this time, so 2.83 kW are in the PRC. PR2 transmission is 229 ppm (see galaxy optics page). Then, the HAM1 splitter is 5.4% to POP (see logs like 63523, 63625). So we expect 34 mW on POP. At this time, there was about 30.5 mW measured on POP according to Kiwamu's calibration.

Comments related to this report
elenna.capote@LIGO.ORG - 12:56, Monday 10 February 2025 (82724)

I have added another filter to the POP_A_LF bank called "to_W_PRC", that should calibrate the readout of this PD to Watts of power in the PRC.

POP_A_LF = T_PR2 * T_M12 * PRC_W, and T_PR2 is 229 ppm and T_M12 is 0.054. I also added a gain of 1e-6 since FM10 calibrates to uW of power on the PD.

Both FM9 (to_W_PRC) and FM10 (to_uW) should be engaged so that POP_A_LF_OUT reads out the power in the PRC.

I loaded the filter but did not engage it.

elenna.capote@LIGO.ORG - 14:28, Tuesday 11 February 2025 (82755)

More thoughts about these calibrations!

I trended back to last Wednesday to get more exact numbers.

input power = 56.8 W

PRG = 51.3

POP A LF (Kiwamu calibration) = 30.7 mW

predicted POP A LF = 0.054 * 229 ppm * 56.8 W * 51.3 W/W = 36 mW

ratio = 30.7 mW / 36 mW = 0.852

If the above calibrations of PRG and input power are correct, we are missing about 15% of the power on POP.

H1 ISC
jim.warner@LIGO.ORG - posted 11:19, Monday 03 February 2025 - last comment - 10:32, Monday 03 March 2025(82608)
ESD glitch limit added to ISC_LOCK

During commisioning this morning, we added the final part of the ESD glitch limiting, by adding the actual limit part to ISC_LOCK. I added a limit value of 524188 to ETMX_L3_ESD_UR/UL/LL/LR filter banks, which are the upstream part of the 28 bit dac configuration for SUS ETMX. These limits are engaged in LOWNOISE_ESD_ETMX, but turned off again in PREP_FOR_LOCKING.

In LOWNOISE_ESD_ETMX I added:

            log('turning on esd limits to reduce ETMX glitches')
            for limits in ['UL','UR','LL','LR']:
                ezca.get_LIGOFilter('SUS-ETMX_L3_ESD_%s'%limits).switch_on('LIMIT')

So if we start losing lock at this step, these lines could be commented out. The limit turn-off in PREP_FOR_LOCKING is probably benign.

Diffs have been accepted in sdf.

I think the only way to tell if this is working is to wait and see if we have fewer ETMX glitch locklosses, or if we start riding through glitches that has caused locklosses in the past.

Comments related to this report
camilla.compton@LIGO.ORG - 11:48, Monday 03 February 2025 (82609)

Using the lockloss tool, we've had 115 Observe locklosses since Dec 01, 23 of those were also tagged ETM glitch, which is around 20%.

camilla.compton@LIGO.ORG - 12:15, Monday 10 February 2025 (82723)SEI

Since Feb 4th, we've had 13 locklosses from Observing, 6 of these tagged ETM_GLITCH: 02/1002/0902/0902/0802/0802/06

sheila.dwyer@LIGO.ORG - 11:30, Tuesday 11 February 2025 (82743)

Jim, Sheila, Oli, TJ

We are thinking about how to evaluate this change.  In the meantime we made a comparison similar to Camilla's: In the 7 days since this change, we've had 13 locklosses from observing, with 7 tagged by the lockloss tool as ETM glitch (and more than that identified by operators), compare to 7 days before the change we had 19 observe locklosses of which 3 had the tag. 

We will leave the change in for another week at least to get more data of what it's impact is.

jim.warner@LIGO.ORG - 10:32, Monday 03 March 2025 (83138)

I forgot to post this at the time, we took the limit turn on out of the guardian on Feb 12, with the last lock ending at 14:30 PST, so locks since that date have had the filters engaged, but since they multiply to 1, they shouldn't have an effect without the limit. We ran this scheme between Feb 3 17:40 utc until Feb 12 22:15 utc.

Camilla asked about turning this back on, I think we should do that. All that needs to be done is uncommenting out the lines (currently 5462-5464 in ISC_LOCK.py):

            #log('turning on esd limits to reduce ETMX glitches')
            #for limits in ['UL','UR','LL','LR']:
            #    ezca.get_LIGOFilter('SUS-ETMX_L3_ESD_%s'%limits).switch_on('LIMIT')

The turn off of the limit is still in one of the very early states is ISC_LOCK, so nothing beyond accepting new sdfs should be needed.

X1 SUS (SUS)
rahul.kumar@LIGO.ORG - posted 16:24, Tuesday 28 January 2025 - last comment - 16:59, Monday 10 February 2025(82499)
A+ O5 HRTS report - all 12 HRTS assembled (with dummy optic), balanced and characterised.

Ryan Crouch, Rahul Kumar

The assembly, balancing and testing of all 12 HRTS (Ham Relay Triple Suspension) for O5 is now complete. Currently all 12 HRTS has dummy optic installed at the bottom stage and once the mirrors are ready (with prisms bonded) then it will be replaced (later this year). I am attaching several pictures from the lab which shows all 12 HRTS staged on the optical bench. Later, six of the suspensions will be transported to LLO.

This plot compares the of transfer function performance of all 12 HRTS for all 6 degrees of freedom. We are still analyzing this data and there is scope for improving a couple of them (especially highlighted in green trace). Sometimes, it is as simple as adjusting the flag position wrt to LED/PD in bosems, and other times further fine tuning the balance and alignment of the blade springs.

The final two HRTS which were assembled by us are of OM0 configuration. This has bottom mass (M3 stage) actuation using AOSEM standoff assembly (as per D2300180_v2) as shows in the picture over here. The magnets used at M3 stage is 2.0 mm D x 0.5 mm T, SmCo. The transfer function results for both the OM0 configurations are as follows - attachment01 and attachment02. Both of them look healthy, when compared with the model.

Given below are the OLC, offsets and gains of the bosems attached to OM0 sn02,

s/n 622  31669 15834 0.947
s/n 639  32414 16207 0.925
s/n 637  28430 14215 1.055
s/n 632  27399 13699 1.094
s/n 684  26138 13069 1.147
s/n 698  32767 16383 0.915
Images attached to this report
Non-image files attached to this report
Comments related to this report
ryan.crouch@LIGO.ORG - 16:59, Monday 10 February 2025 (82730)SUS

I remeasured the associated suspension with the lime green trace (2024-9-16), a suspended version of the HRTS with structure s/n 012. Through adjusting the flags centering and position I was able to improve the measurement results, especially the verticle DOF, yaw also looks better. Previous measurement vs new measurement.

Non-image files attached to this comment
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